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Document 42012X1114(01)

Regulation No 41 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of motor cycles with regard to noise

OJ L 317, 14.11.2012, p. 1–38 (BG, ES, CS, DA, DE, ET, EL, EN, FR, IT, LV, LT, HU, MT, NL, PL, PT, RO, SK, SL, FI, SV)

Legal status of the document In force

ELI: http://data.europa.eu/eli/reg/2012/41/oj

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Official Journal

14.11.2012

Official Journal of the European Union

L 317/1

Only the original UN/ECE texts have legal effect under international public law. The status and date of entry into force of this Regulation should be checked in the latest version of the UN/ECE status document TRANS/WP.29/343, available at:

http://www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29fdocstts.html

Regulation No 41 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of motor cycles with regard to noise

Incorporating all valid text up to:

04 series of amendments — Date of entry into force: 13 April 2012

CONTENTS

Scope

Definitions, terms and symbols

Application for approval

Markings

Approval

Specifications

Modification and extension of the approval of the motor cycle type or of the type of exhaust or silencing system(s)

Conformity of production

Penalties for non-conformity of production

10.

Production definitely discontinued

11.

Names and addresses of Technical Services responsible for conducting approval tests, and of the Type Approval Authorities

12.

Transitional provisions

ANNEXES

ANNEX 1 —

Communication

ANNEX 2 —

Arrangements of approval marks

ANNEX 3 —

Methods and instruments for measuring noise made by motor cycles

ANNEX 4 —

Specifications for the test site

ANNEX 5 —

Exhaust or silencing systems containing fibrous material

ANNEX 6 —

Maximum limits of sound levels

ANNEX 7 —

Additional Sound Emission Provisions (ASEP)

ANNEX 8 —

Statement of compliance with the Additional Sound Emission Provisions (ASEP)

1. SCOPE

This Regulation applies to vehicles of category L3 (1) with regard to noise.

2. DEFINITIONS, TERMS AND SYMBOLS

For the purpose of this Regulation

2.1. ‘Approval of a motor cycle’ means the approval of a motor cycle type with regard to noise;

2.2. ‘Type of motor cycle as regards its sound level and exhaust system’ means motor cycles which do not differ in such essential respects as the following:

2.2.1.

The type of engine (two-stroke or four-stroke, reciprocating piston engine or rotary-piston engine, number and capacity of cylinders, number and type of carburettors or injection systems, arrangement of valves, rated maximum net power and corresponding engine speed). For rotary-piston engines the cubic capacity should be taken to be double of the volume of the chamber;

2.2.2.

Transmission system, in particular the number and ratios of the gears;

2.2.3.

Number, type and arrangement of exhaust or silencing systems.

2.3. ‘Exhaust or silencing system’ means a complete set of components necessary to limit the noise caused by a motor cycle engine and its exhaust.

2.3.1.

‘Original exhaust or silencing system’ means a system of a type fitted to the vehicle at the time of type approval or extension of type approval. It may also be the vehicle manufacturer’s replacement part.

2.3.2.

‘Non-original exhaust or silencing system’ means a system of a type other than that fitted to the vehicle at the time of type approval or extension of type approval.

2.4. ‘Exhaust or silencing systems of differing types’ means systems which are fundamentally different in one of the following ways:

2.4.1.

Systems comprising components bearing different factory or trade marks;

2.4.2.

Systems comprising any component made of materials of different characteristics or comprising components which are of a different shape or size;

2.4.3.

Systems in which the operating principles of at least one component are different;

2.4.4.

Systems comprising components in different combinations.

2.5. ‘Component of an exhaust or silencing system’ means one of the individual components which together form the exhaust system (such as exhaust pipework, the silencer proper) and the intake system (air filter) if any.

If the engine has to be equipped with an intake system (air filter and/or intake noise absorber) in order to comply with the maximum permissible sound levels, the filter and/or absorber shall be treated as components having the same importance as the exhaust system.

2.6. ‘Kerb mass’ (as defined in section 4.1.2 of ISO 6726: 1988) means the mass of the vehicle ready for normal operation and fitted with the following equipment:

(a)	Full electrical equipment including the lighting and signalling devices supplied by the manufacturer;

(b)	All instruments and fittings required by any legislation in respect of which a measurement of the vehicle dry mass is being made;

(c)	Full complement of liquids to ensure the correct functioning of every part of the vehicle and the fuel tank filled at least to 90 per cent of the capacity specified by the manufacturer;

(d)	Auxiliary equipment usually supplied by the manufacturer in addition to that necessary for normal operation (tool-kit, carrier(s), windscreen(s), protective equipment, etc.)

Notes:

In the case of a vehicle which operates on a fuel/oil mixture:

1.1.	Where the fuel and oil are premixed, the word ‘fuel’ is interpreted as including such premixture of fuel and oil;

1.2.	Where the fuel and oil are separately metered, the word ‘fuel’ is interpreted as including only the petrol. [The ‘oil’, in this case, is already included in subparagraph (c) of this paragraph.]

2.7. ‘Rated maximum net power’ means the rated engine power as defined in ISO 4106:2004.

The symbol Pn denotes the numerical value of the rated maximum net power expressed in kilowatts.

2.8. ‘Rated engine speed’ means the engine speed at which the engine develops its rated maximum net power as stated by the manufacturer.

The symbol S denotes the numerical value of the rated engine speed expressed in revolutions per minute (2).

2.9. ‘Power-to-mass ratio index’ means the ratio of the rated maximum net power of a vehicle to its mass. It is defined as:

Where m kerb is the numerical value of the kerb mass as defined in paragraph 2.6 above, expressed in kilograms.

The symbol PMR denotes the power-to-mass ratio index.

2.10. ‘Maximum speed’ means the maximum vehicle speed as defined in ISO 7117:1995.

The symbol v max denotes the maximum speed.

2.11. ‘Locked gear’ means the control of the transmission such that the transmission gear ratio cannot change during a test.

2.12. ‘Engine’ means the power source of the vehicle without detachable accessories.

2.13. Following is a table containing all symbols used in this Regulation:

Symbol	Units	Explanation	Reference
AA'	—	virtual line on the test track	Annex 4 – Figure 1
a wot	m/s2	calculated acceleration	Annex 3 – 1.4.2.
a wot,ref	m/s2	prescribed reference acceleration	Annex 3 – 1.3.3.3.1.2.
a urban	m/s2	prescribed target acceleration	Annex 3 – 1.3.3.3.1.2.
BB'	—	virtual line on the test track	Annex 4 – Figure 1
CC'	—	virtual line on the test track	Annex 4 – Figure 1
k	—	gear weighting factor	Annex 3 – 1.4.3.
k p	—	partial power factor	Annex 3 – 1.4.4.
L	dB(A)	sound pressure level	Annex 3 – 1.4.1.
l PA	m	pre-acceleration length	Annex 3 – 1.3.3.1.1.
m kerb	kg	kerb mass of the vehicle	2.6.
m t	kg	test mass of the vehicle	Annex 3 – 1.3.2.2.
n	min–1	measured engine speed	—
n idle	min–1	engine speed at idle	—
n wot(i)	min–1	n PP' corresponding to L wot(i)	Annex 7 – 2.6.
PP'	—	virtual line on the test track	Annex 4 – Figure 1
PMR	—	power-to-mass ratio index	2.9.
P n	kW	rated maximum net power	2.7.
S	min– 1	rated engine speed	2.8.
v	km/h	measured vehicle speed	—
v max	km/h	maximum speed	2.10.
v test	km/h	prescribed test speed	Annex 3 – 1.3.3.1.1.

The following indices are used for measured engine speeds n and vehicle speeds v to indicate the location or rather time of the measurement:

(a)	AA' denoting that the measurement corresponds to the point in time when the front of the vehicle passes the line AA' (see Annex 4 – Figure 1); or

(b)	PP' denoting that the measurement corresponds to the point in time when the front of the vehicle passes the line PP' (see Annex 4 – Figure 1); or

(c)	BB' denoting that the measurement corresponds to the point in time when the rear of the vehicle passes the line BB' (see Annex 4 – Figure 1).

The following indices are used for calculated full throttle accelerations a wot and measured sound pressure levels L to indicate the gear used for the test:

(a)	‘(i)’ denoting, in the case of a two-gear test, the lower gear (i.e. the gear with the higher gear transmission ratio) and otherwise referring to the single test gear or gear selector position used; or

(b)	‘(i + 1)’ denoting, in the case of a two-gear test, the higher gear (i.e. the gear with the lower gear transmission ratio).

Measured sound pressure levels L also carry an index indicating the type of the respective test:

(a)	‘Wot’ denoting a full throttle acceleration test (see paragraph 1.3.3.1.1 of Annex 3); or

(b)	‘CRS’ denoting a constant speed test (see paragraph 1.3.3.3.2 of Annex 3); or

(c)	‘Urban’ denoting a weighted combination of a constant speed test and a full throttle acceleration test (see paragraph 1.4.6.2 of Annex 3).

The index ‘j’ referring to the number of the test run can be used in addition to the indices mentioned above.

3. APPLICATION FOR APPROVAL

3.1. The application for approval of a motor cycle type with regard to its sound emissions shall be submitted by its manufacturer or by his duly accredited representative.

3.2. It shall be accompanied by the under mentioned documents in triplicate and the following particulars:

3.2.1.

A description of the motor cycle type with regard to the items mentioned in paragraph 2.2 above. The numbers and/or symbols identifying the engine type and the motor cycle type shall be specified; a description of the motor cycle type with regard to the items mentioned in paragraph 2.2 above. The numbers and/or symbols identifying the engine type and the motor cycle type shall be specified;

3.2.2.

A list of the components, duly identified, constituting the exhaust or silencing system;

3.2.3.

A drawing of the assembled exhaust or silencing system and an indication of its position on the motor cycle;

3.2.4.

Drawings of each component to enable it to be easily located and identified, and a specification of the materials used;

3.2.5.

Cross-sectional drawings indicating the dimensions of the exhaust system. A copy of these drawings shall be appended to the certificate referred to in Annex 1.

3.3. At the request of the Technical Service responsible for conducting approval tests, the motor cycle manufacturer shall, in addition, submit a sample of the exhaust or silencing system.

3.4. A motor cycle representative of the motor cycle type to be approved shall be submitted to the Technical Service responsible for conducting approval tests.

3.5. A test report from the Technical Service conducting the type approval test shall be submitted to the Type Approval Authority.

This test report shall at least include the following information:

(a)	Details of the test site (e.g. surface temperature, absorption coefficient, etc.), test site location, site orientation and weather conditions including wind speed and air temperature, direction, barometric pressure, humidity;

(b)	The type of measuring equipment including the windscreen;

(c)	The A-weighted sound pressure level typical of the background noise;

(d)

The identification of the vehicle, its engine, its transmission system, including available transmission ratios, size and type of tyres, tyre pressure, type approval number of the tyres (if available) or tyre manufacturer and commercial description of the tyres (i.e. trade name, speed index, load index), rated maximum net power, test mass, power to mass ratio index, a wot ref, a urban, vehicle length;

(e)	The transmission gears or gear ratios used during the test;

(f)	The vehicle speed and engine speed at the beginning of the period of acceleration and the location of the beginning of the acceleration per gear used;

(g)	The vehicle speed and engine speed at PP' and at the end of the acceleration per valid measurement;

(h)	The method used for calculation of the acceleration;

(i)	The intermediate measurement results a wot(i), a wot(i + 1), L wot(i), L wot(i + 1), L crs(i) and L crs(i + 1), if applicable;

(j)	The weighting factors k and k p and the final measurement results L wot, L crs and L urban;

(k)	The auxiliary equipment of the vehicle, where appropriate, and its operating conditions;

(l)	All valid A-weighted sound pressure level values measured for each test, listed according to the side of the vehicle and the direction of the vehicle movement on the test site; and

(m)	All relevant information necessary to obtain the different sound emission levels.

4. MARKINGS

4.1. The components of the exhaust or silencing system shall bear at least the following identifications:

4.1.1.

The trade name or mark of the manufacturer of the exhaust or silencing system and of its components;

4.1.2.

The trade description given by the manufacturer;

4.1.3.

The identifying part numbers; and

4.1.4.

For all original silencers, the ‘E’ mark followed by the identification of the country which granted the component type approval (3).

4.1.5.

Any packing of original replacement exhaust or silencing systems shall be marked legibly with the words ‘original part’ and the make and type references integrated together with the ‘E’ mark and also the reference of the country of origin.

4.1.6.

Such markings shall be indelible, clearly legible and also visible, in the position at which it is to be fitted to the vehicle.

5. APPROVAL

5.1. If the motor cycle type submitted for approval pursuant to this Regulation meets the requirements of paragraphs 6 and 7 below, approval of that motor cycle type shall be granted.

5.2. An approval number shall be assigned to each type approved. Its first two digits indicate the series of amendments incorporating the most recent major technical amendments made to the Regulation at the time of issue of the approval. The same Contracting Party may not assign the same number to the same motor cycle type equipped with another type of exhaust or silencing system, or to another motor cycle type.

5.3. Notice of approval or of refusal of approval of a motor cycle type pursuant to this Regulation shall be communicated to the Parties to the Agreement which apply this Regulation, by means of a form conforming to the model in Annex 1 to this Regulation and of drawings of the exhaust or silencing system, supplied by the applicant for approval in a format not exceeding A4 (210 x 297 mm) or folded to that format and on an appropriate scale.

5.4. There shall be affixed, conspicuously and in a readily accessible place specified on the approval form, to every motor cycle conforming to a motor cycle type approved under this Regulation an international approval mark consisting of:

5.4.1.

A circle surrounding the letter ‘E’ followed by the distinguishing number of the country which has granted approval (4); and

5.4.2.

The number of this Regulation, followed by the letter ‘R’, a dash and the approval number to the right of the circle prescribed in paragraph 5.4.1.

5.5. If the motor cycle conforms to a motor cycle type approved, under one or more other Regulations annexed to the Agreement, in the country which has granted approval under this Regulation, the symbol prescribed in paragraph 5.4.1 need not be repeated; in such a case the Regulation and approval numbers and the additional symbols of all the Regulations under which approval has been granted in the country which has granted approval under this Regulation shall be placed in vertical columns to the right of the symbol prescribed in paragraph 5.4.1.

5.6. The approval mark shall be clearly legible and be indelible.

5.7. The approval mark shall be placed close to or on the motor cycle data plate affixed by the manufacturer.

5.8. Annex 2 to this Regulation gives examples of arrangements of the approval mark.

6. SPECIFICATIONS

6.1. General specifications

6.1.1.

The following information shall be provided on the motor cycle in an easily accessible but not necessarily immediately visible location:

(a)	The manufacturer’s name;

(b)

The target engine speed and the final result of the stationary test as defined in paragraph 2 of Annex 3 to this Regulation;

In addition for motor cycles of category L3 with PMR > 50 the in-use compliance reference data as defined in paragraph 3 of Annex 3 to this Regulation shall be displayed. This data can be provided either in one single location together with the information in 6.1.1(a) and 6.1.1(b) or in a second different location together with the information in 6.1.1(a) (4).

6.2. Specifications regarding sound levels

6.2.1.

The sound emissions of the motor cycle type submitted for approval shall be measured by the two methods described in Annex 3 to this Regulation (motor cycle in motion and motor cycle when stationary) (5); in the case of a motor cycle where an internal combustion engine does not operate when the motor cycle is stationary, the emitted noise shall only be measured in motion.

6.2.2.

The test results obtained in accordance with the provisions of paragraph 6.2.1 above shall be entered in the test report and on a form conforming to the model in Annex 1 to this Regulation.

6.2.3.

The test results for the motor cycle in motion obtained in accordance with paragraph 1 of Annex 3 to this Regulation and mathematically rounded to the nearest integer shall not exceed the limits prescribed (for new motor cycles and new silencing systems) in Annex 6 to this Regulation for the category to which the motor cycle belongs. In any case, L wot shall not exceed the limit value for L urban by more than 5 dB.

6.3. Additional sound emission provisions

6.3.1.

The motor cycle manufacturer shall not intentionally alter, adjust, or introduce any device or procedure solely for the purpose of fulfilling the noise emission requirements of this Regulation, which will not be operational during typical on-road operation.

6.3.2.

The vehicle type to be approved shall meet the requirements of Annex 7 to this Regulation. If the motor cycle has user selectable software programs or modes which affect the sound emission of the vehicle, all these modes shall be in compliance with the requirements in Annex 7. Testing shall be based on the worst case scenario.

6.3.3.

In the application for type approval or for modification or extension of a type approval the manufacturer shall provide a statement in accordance with Annex 8 that the vehicle type to be approved complies with the requirements of paragraphs 6.3.1 and 6.3.2 of this Regulation.

6.3.4.

The competent authority may carry out any test prescribed in this Regulation.

6.4. Additional specifications regarding exhaust or silencing systems filled with fibrous material

6.4.1.

If the exhaust or silencing system of the motor cycle contains fibrous materials the requirements of Annex 5 shall apply. If the intake of the engine is fitted with an air filter and/or an intake-noise absorber which is (are) necessary in order to ensure compliance with the permissible sound level, the filter and/or absorber shall be considered to be part of the silencing system, and the requirements of Annex 5 shall also apply to them.

6.5. Additional prescriptions related to tamperability and manually adjustable multi-mode exhaust or silencing systems

6.5.1.

All exhaust or silencing systems shall be constructed in a way that does not easily permit removal of baffles, exit-cones and other parts whose primary function is as part of the silencing/expansion chambers. Where incorporation of such a part is unavoidable, its method of attachment shall be such that removal is not facilitated easily (e.g. with conventional threaded fixings) and should also be attached such that removal causes permanent/irrecoverable damage to the assembly.

6.5.2.

Exhaust or silencing systems with multiple, manually adjustable operating modes shall meet all requirements in all operating modes. The reported noise levels shall be those resulting from the mode with the highest noise levels.

7. MODIFICATION AND EXTENSION OF THE APPROVAL OF THE MOTOR CYCLE TYPE OR OF THE TYPE OF EXHAUST OR SILENCING SYSTEM(S)

7.1. Every modification of the motor cycle type or of the exhaust or silencing system shall be notified to the Type Approval Authority which approved the motor cycle type. The Type Approval Authority may then either:

7.1.1.

Consider that the modifications made are unlikely to have appreciable adverse effects, and that in any case the motor cycle still complies with the requirements of this Regulation; or

7.1.2.

Require a further test report from the Technical Service responsible for conducting the tests.

7.2. Confirmation or refusal of approval, specifying the alterations, shall be communicated by the procedure specified in paragraph 5.3 above to the Parties to the Agreement which apply this Regulation.

7.3. The competent authority which issued the approval extension shall assign a serial number to the extension and shall so notify the other Parties to the 1958 Agreement applying this Regulation, by means of a communication form conforming to the model in Annex 1 to this Regulation.

8. CONFORMITY OF PRODUCTION

The conformity of production procedures shall comply with those set out in the Agreement, Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2), with the following requirements:

8.1. Any motor cycle manufactured shall conform to a type of motor cycle approved pursuant to this Regulation, be equipped with the silencer with which it was type approved and satisfy the requirements of paragraph 6 above.

8.2. In order to test conformity as required above, a sample motorcycle will be taken from the production line of the type approved pursuant to this Regulation. Its sound levels measured and processed (L urban and L wot) according to the method described in Annex 3, with the same gear(s) and pre-acceleration distance(s) as used in the original type approval test, and mathematically rounded to the nearest integer shall not exceed by more than 3,0 dB(A) the values measured and processed at the time of type approval, nor by more than 1,0 dB(A) the limits laid down in Annex 6 of this Regulation.

8.3. For conformity of production, the manufacturer shall make a renewed declaration that the type still fulfils the requirements of paragraphs 6.3.1 and 6.3.2 of this Regulation. In case of testing according to Annex 7, the measured sound levels shall not exceed by more than 1,0 dB(A) the limits given in paragraph 2.6 of Annex 7.

9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION

9.1. The approval granted in respect of a motor cycle type pursuant to this Regulation may be withdrawn if the requirements laid down in paragraph 8 above are not met.

9.2. If a Party to the Agreement which applies this Regulation withdraws an approval it has previously granted, it shall forthwith so notify the other Contracting Parties applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

10. PRODUCTION DEFINITELY DISCONTINUED

If the holder of the approval completely ceases to manufacture a type of a motor cycle approved in accordance with this Regulation, he shall inform the authority which granted the approval. Upon receiving the relevant communication, that authority shall inform thereof the other Parties to the Agreement applying this Regulation by means of a communication form conforming to the model in Annex 1 to this Regulation.

11. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL TESTS, AND OF THE TYPE APPROVAL AUTHORITIES

The Parties to the 1958 Agreement applying this Regulation shall communicate to the United Nations Secretariat the names and addresses of the Technical Services responsible for conducting approval tests and of the Type Approval Authorities which grant approval and to which forms certifying approval or extension or refusal or withdrawal of approval, issued in other countries, are to be sent.

12. TRANSITIONAL PROVISIONS

12.1. As from the official date of entry into force of the 04 series of amendments, no Contracting Parties applying this Regulation shall refuse to grant approval under this Regulation as amended by the 04 series of amendments.

12.2. As from 1 January 2014, Contracting Parties applying this Regulation shall grant approvals only if the motor cycle type to be approved meets the requirements of this Regulation as amended by the 04 series of amendments.

12.3. Contracting Parties applying this Regulation shall not refuse to grant extensions of approval in accordance with the preceding series of amendments to this Regulation.

12.4. Contracting Parties applying this Regulation shall continue to grant approvals to those types of motor cycles which conform to the requirements of this Regulation as amended by the preceding series of amendments until the date in paragraph 12.2.

12.5. Approvals granted under this Regulation before the entry into force of the 04 series of amendments and all extensions of such approvals, including those granted subsequently under a preceding series of amendments to this Regulation, shall remain valid indefinitely. If the motor cycle type approved under the preceding series of amendments meets the requirements of this Regulation as amended by the 04 series of amendments, the Contracting Party which granted the approval shall so notify the other Contracting Parties applying this Regulation.

12.6. No Contracting Party applying this Regulation shall refuse national type approval of a motor cycle type approved under the 04 series of amendments to this Regulation or meeting the requirements thereof.

12.7. As from 1 January 2017, Contracting Parties applying this Regulation may refuse first national registration (first entry into service) of a motor cycle which does not meet the requirements of the 04 series of amendments to this Regulation.

(1) As defined in the Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev.2, paragraph 2.

(2) If the rated maximum net power is reached at several engine speeds, S is used in this Regulation as the highest engine speed at which the rated maximum net power is reached.

(3) The distinguishing numbers of the Contracting Parties to the 1958 Agreement are reproduced in Annex 3 to Consolidated Resolution on the Construction of Vehicles (R.E.3), document ECE/TRANS/WP.29/78/Rev.2/Amend.1.

(4) The establishment of an electronic type approval database is expected to make the provision of in-use compliance reference data on the motor cycle superfluous.

(5) A test is made on a stationary motor cycle in order to provide a reference value for administrations which use this method to check motor cycles in use.

ANNEX 1

COMMUNICATION

(Maximum format: A4 (210 × 297 mm)

Text of image

Text of image

Text of image

ANNEX 2

ARRANGEMENTS OF APPROVAL MARKS

Model A

(See paragraph 5.4 of this Regulation)

The above approval mark affixed to a motor cycle shows that the motor cycle type concerned has, with regard to noise, been approved in the Netherlands (E4) pursuant to Regulation No 41 under approval number 042439. The first two digits of the approval number indicate that the approval was granted in accordance with the requirements of Regulation No 41 as amended by the 04 series of amendments.

Model B

(See paragraph 5.5 of this Regulation)

The above approval mark affixed to a motor cycle shows that the motor cycle type concerned has been approved in the Netherlands (E 4) pursuant to Regulations Nos 41 and 10. The first two digits of the approval numbers indicate that on the date on which these approvals were granted, Regulation No 41 included 04 series of amendments and Regulation No 10 included the 01 series of amendments.

ANNEX 3

METHODS AND INSTRUMENTS FOR MEASURING NOISE MADE BY MOTOR CYCLES

1. Noise of the motor cycle in motion (measuring conditions and method for testing of the vehicle during component type approval).

1.1. Measuring instruments

1.1.1. Acoustic measurements

1.1.1.1. General

The apparatus used for measuring the sound pressure level shall be a sound level meter or equivalent measuring system meeting the requirements of Class 1 instruments (inclusive of the recommended windscreen, if used). These requirements are described in IEC 61672-1:2002.

Measurements shall be carried out using the time weighting ‘F’ of the acoustic measuring instrument and the ‘A’ frequency weighting curve also described in IEC 61672-1:2002. When using a system that includes periodic monitoring of the A-weighted sound pressure level, a reading should be made at a time interval not greater than 30 ms.

The instruments shall be maintained and calibrated in accordance with the instructions of the instrument manufacturer.

1.1.1.2. Calibration

At the beginning and at the end of every measurement session, the entire acoustic measuring system shall be checked by means of a sound calibrator that fulfils the requirements of Class 1 sound calibrators according to IEC 60942:2003. Without any further adjustment, the difference between the readings shall be less than or equal to 0,5 dB(A). If this value is exceeded, the results of the measurements obtained after the previous satisfactory check shall be discarded.

1.1.1.3. Compliance with requirements

Compliance of the sound calibrator with the requirements of IEC 60942:2003 shall be verified once a year. Compliance of the instrumentation system with the requirements of IEC 61672-1:2002 shall be verified at least every two years. All compliance testing shall be conducted by a laboratory which is authorised to perform calibrations traceable to the appropriate standards.

1.1.2. Instrumentation for speed measurements

The rotational speed of the engine shall be measured with an instrument meeting specification limits of at least ± 2 per cent or better at the engine speeds required for the measurements being performed.

The road speed of the vehicle shall be measured with instruments meeting specification limits of at least ± 0,5 km/h when using continuous measuring devices.

If testing uses independent measurements of speed, this instrumentation shall meet specification limits of at least ± 0,2 km/h (1).

1.1.3. Meteorological instrumentation

The meteorological instrumentation used to monitor the environmental conditions during the test shall meet the following specifications:

± 1 °C or less for a temperature measuring device;

± 1,0 m/s for a wind speed measuring device;

± 5 hPa for a barometric pressure measuring device;

± 5 per cent for a relative humidity measuring device.

1.2. Acoustical environment, meteorological conditions and background noise

1.2.1. Test site

The test site shall consist of a central acceleration section surrounded by a substantially level test area. The acceleration section shall be level; its surface shall be dry and so designed that rolling noise remains low.

On the test site the variations in the free sound field between the sound source at the centre of the acceleration section and the microphone shall be maintained to within 1 dB(A). This condition will be deemed to be met if there are no large objects which reflect sound, such as fences, rocks, bridges or buildings, within 50 m of the centre of the acceleration section. The road surface covering of the test site shall conform to the requirements of Annex 4.

The microphone shall not be obstructed in any way which could affect the sound field, and no person may stand between the microphone and the sound source. The observer carrying out the measurements shall take up position so as not to affect the readings of the measuring instrument.

1.2.2. Meteorological conditions

The meteorological instrumentation shall deliver data representative of the test site, and shall be positioned adjacent to the test area at a height representative of the height of the measuring microphone.

The measurements shall be made when the ambient air temperature is within the range from 5 °C to 45 °C. The tests shall not be carried out if the wind speed, including gusts, at microphone height exceeds 5 m/s, during the noise measurement interval.

A value representative of temperature, wind speed and direction, relative humidity and barometric pressure shall be recorded during the noise measurement interval.

1.2.3. Background noise

Any sound peak which appears to be unrelated to the characteristics of the general noise level of the vehicle shall be ignored in taking the readings.

The background noise shall be measured for a duration of 10 s immediately before and after a series of vehicle tests. The measurements shall be made with the same microphones and microphone locations used during the test. The maximum A-weighted sound pressure level shall be reported.

The background noise (including any wind noise) shall be at least 10 dB(A) below the A-weighted sound pressure level produced by the vehicle under test. If the difference between the background sound pressure level and the measured sound pressure level is between 10 dB(A) and 15 dB(A), in order to calculate the test result the appropriate correction shall be subtracted from the readings on the sound level meter, as given in the table.

Correction applied to individual measured test value

Background sound pressure level difference to measured sound pressure level, in dB	10	11	12	13	14	≥ 15
Correction, in dB(A)	0,5	0,4	0,3	0,2	0,1	0,0

1.3. Test procedures

1.3.1. Microphone positions

The distance of the microphone positions from the line CC', on the microphone line PP', perpendicular to the reference line CC' on the test track (see Annex 4 – Figure 1), shall be 7,5 ± 0,05 m.

The microphones shall be located 1,2 ± 0,02 m above the ground level. The reference direction for free-field conditions (see IEC 61672-1:2002) shall be horizontal and directed perpendicularly towards the path of the vehicle line CC'.

1.3.2. Conditions of the vehicle

1.3.2.1. General Conditions

The vehicle shall be supplied as specified by the vehicle manufacturer.

Before the measurements are started, the vehicle shall be brought to its normal operating conditions.

If the motor cycle is fitted with fans with an automatic actuating mechanism, this system shall not be interfered with during the sound measurements. For motor cycles having more than one driven wheel, only the drive provided for normal road operation may be used. If the motor cycle is fitted with a sidecar, this shall be removed for the purposes of the test.

1.3.2.2. Test mass of the vehicle

Measurements shall be made on vehicles at the following test mass m t, in kg, specified as:

(75 ± 5 kg equates to mass of the driver and instrumentation)

1.3.2.3. Tyre selection and condition

The tyres shall be appropriate for the vehicle and shall be inflated to the pressure recommended by the vehicle manufacturer for the test mass of the vehicle.

The tyres shall be selected by the vehicle manufacturer, and correspond to one of the tyre sizes and types designated for the vehicle by the vehicle manufacturer. The minimum tread depth shall be at least 80 per cent of the full tread depth.

1.3.3. Operating conditions

1.3.3.1. General operating conditions

The path of the centreline of the vehicle shall follow the line CC' as closely as possible throughout the entire test, from the approach to line AA' until the rear of the vehicle passes line BB' (see Annex 4 – Figure 1).

1.3.3.1.1. For full throttle acceleration tests the vehicle shall approach the line AA' at constant speed. When the front of the vehicle passes the line AA' the throttle control shall be shifted to the maximum throttle position as rapidly as possible and kept in this position until the rear of the vehicle passes the BB'. At this moment the throttle control shall be shifted to the idle position as rapidly as possible.

Unless specified otherwise the manufacturer may choose to use pre-acceleration in a full throttle acceleration test for the purpose of achieving a stable acceleration between the lines AA' and BB'. A test with pre-acceleration proceeds as described above except for the fact that the throttle control is shifted to the maximum throttle position already before the vehicle passes the line AA', namely when the front of the vehicle is still at a distance l PA, the pre-acceleration length, from the line AA'.

The approach velocity shall be chosen such that the vehicle reaches a prescribed test speed v test when its front passes the line PP'.

1.3.3.1.2. During constant speed tests, the acceleration control unit shall be positioned to maintain a constant vehicle speed between the lines AA' and BB'.

1.3.3.2. Operating conditions for vehicles with PMR ≤ 25

The vehicle is tested in a full throttle acceleration test with the following specifications:

(a)	The test speed shall be .

(b)	When the rear of the vehicle passes the line BB' the vehicle speed shall not exceed 75 per cent of the maximum vehicle speed as defined in paragraph 2.10 of this Regulation neither shall the engine speed exceed the rated engine speed.

The gear for the test shall be selected in the following iterative way:

The initial test speed shall be as specified above. The test speed shall be reduced by increments of 10 per cent of v test (i.e. 4 km/h) in case the exit speed v BB' exceeds 75 per cent of v max or in case the engine speed exceeds the rated engine speed S at BB'. The selected gear shall be the lowest one without exceeding the rated engine speed S during the test. The final test conditions are determined by the lowest possible gear at the highest possible test speed without exceeding either 75 per cent of v max or the rated engine speed S at BB'.

To save testing time, the manufacturer may provide information on the iterative procedure for gear selection specified above.

A flow chart of the test procedure is given in Appendix 1 to this Annex.

1.3.3.3. Operating conditions for vehicles with PMR > 25

The vehicle is tested in a full throttle acceleration test and in a constant speed test.

1.3.3.3.1. Full throttle acceleration test

For the full throttle acceleration tests the test speed and the mean acceleration of the vehicle in the test track are specified.

The accelerations are not measured directly but calculated from measurements of the vehicle speed as described in paragraph 1.4 below.

1.3.3.3.1.1. Test speed

The test speed v test shall be:

40 ± 1 km/h for vehicles with a PMR ≤ 50; and

50 ± 1 km/h for vehicles with a PMR > 50.

If, in a given gear, the exit speed v BB' exceeds 75 per cent of the maximum speed v max of the vehicle, the test speed for test in this gear shall be successively reduced by increments of 10 per cent of v test (i.e. 4 km/h or 5 km/h) until the exit speed v BB' falls below 75 per cent of v max.

1.3.3.3.1.2. Reference acceleration and target acceleration

During the full throttle acceleration tests the vehicle shall reach the reference acceleration a wot ref defined as:

for vehicles with a PMR ≤ 50; and

for vehicles with a PMR > 50

The results of these full throttle acceleration tests are used together with the results of constant speed tests to approximate a partial load acceleration typical for urban driving. The corresponding target acceleration a urban is defined as:

for vehicles with a PMR ≤ 50; and

for vehicles with a PMR > 50.

1.3.3.3.1.3. Gear selection

It is the responsibility of the manufacturer to determine the correct manner of testing to achieve the required test speed and acceleration.

1.3.3.3.1.3.1. Vehicles with manual transmissions, automatic transmissions, or transmissions with continuously variable transmission ratios (CVTs) tested with locked gears

The selection of gears for the test depends on the specific acceleration under full throttle in the various gears in relation to the reference acceleration a wot,ref required for the full-throttle acceleration tests according to paragraph 1.3.3.3.1.2 above.

The following conditions for the gear selection are possible:

(a)	If there are two gears that give an acceleration in a tolerance band of ± 10 per cent of the reference acceleration a wot,ref, the gear nearest the reference acceleration shall be used for the test and shall be identified as such in the test report;

(b)	If only one specific gear gives an acceleration in the tolerance band of ± 10 per cent of the reference acceleration a wot ref, the test shall be performed with that gear;

(c)

If none of the gears gives the required acceleration to within ± 10 per cent of the reference acceleration a wot,ref, then tests shall be performed in two adjacent gears (i) and (i + 1) chosen such that the gear (i), gives an acceleration higher and the gear (i + 1) an acceleration lower than the reference acceleration a wot,ref.

If the rated engine speed is exceeded in a gear before the vehicle passes BB', the next higher gear shall be used.

If the vehicle has more than one gear the first gear shall not be used. If awot,ref can only be achieved in first gear, second gear shall be used.

1.3.3.3.1.3.2. Vehicles with automatic transmissions, adaptive transmissions or transmissions with variable transmission ratios tested with non-locked gears

The gear selector position for full automatic operation shall be used.

The test may then include a gear change to a lower gear and a higher acceleration. A gear change to a higher gear and a lower acceleration is not allowed. In any case, a gear change to a gear which is typically not used at the specified condition in urban traffic shall be avoided.

Therefore, it is permitted to establish and use electronic or mechanical devices, including alternative gear selector positions, to prevent a downshift to a gear which is typically not used at the specified test condition in urban traffic. If such devices are used, no pre-acceleration may be applied. The functionality of the devices shall be described in the communication form.

1.3.3.3.2. Constant speed test

For the constant speed tests the gears or gear selector positions and the test speeds shall be identical to those used in the full throttle acceleration tests previously performed.

1.4. Data processing and reporting

1.4.1. General

At least three measurements for each test condition shall be made on each side of the vehicle and for each gear.

The maximum A-weighted sound pressure level L indicated during each passage of the vehicle between AA' and BB' (see Annex 4 – Figure 1) shall be reduced by 1 dB(A) to account for measurement inaccuracy and mathematically rounded to the nearest first decimal place (e.g. XX.X) for both microphone positions. If a sound peak obviously out of character with the general sound pressure level is observed, that measurement shall be discarded.

The first three valid consecutive measurement results for each test condition, within 2,0 dB(A), allowing for the deletion of non-valid results, shall be used for the calculation of the appropriate intermediate or final result.

The speed measurements at AA' (v AA'), BB' (v BB'), and PP' (v PP') shall be mathematically rounded to the nearest first decimal place (e.g. XX.X) and noted for further calculations.

1.4.2. Calculation of the acceleration

All accelerations are calculated using different speeds of the vehicle on the test track. Depending on the type of transmission the acceleration is either calculated between the lines AA' and BB' or between the lines PP' and BB' as specified below. The method used for the calculation of the acceleration shall be indicated in the test report.

In all of the following cases the acceleration is calculated between the lines AA' and BB' as specified in paragraph 1.4.2.1 below:

(a)	The vehicle is equipped with a manual transmission.

(b)	The vehicle is equipped with an automatic transmission or with a transmission with continuously variable gear ratios (CVT’s) but tested with locked gear ratios.

(c)

The vehicle is equipped with an automatic transmission, an adaptive transmission or a transmission with variable gear ratios and tested with non-locked gear ratios, and electronic or mechanical devices, including alternative gear selector positions, are used to prevent a downshift to a gear which is typically not used at the specified test condition in urban traffic.

In all other cases the acceleration is calculated between the lines PP' and BB' as specified in paragraph 1.4.2.2 below.

1.4.2.1. Calculation of the acceleration between the lines AA' and BB'

The acceleration is calculated from measurements of the vehicle speed at the lines AA' and BB':

Where:

The index ‘(i)’ refers to the gear used and the index ‘j’ to the number of the individual measurement. The velocities are expressed in units of km/h and the resulting accelerations have units of m/s2;

l ref is either the length of vehicle or 2 m, freely selectable by the vehicle manufacturer, Type Approval Authority and Technical Service.

1.4.2.2. Calculation of the acceleration between the lines PP' and BB'

The acceleration is calculated from measurements of the vehicle speed at the lines PP' and BB':

Where:

l ref is either the length of vehicle or 2 m, freely selectable by the vehicle manufacturer, Type Approval Authority and Technical Service.

Pre-acceleration shall not be used.

1.4.2.3. Averaging of individual measurements

The calculated accelerations from three valid runs are arithmetically averaged to give the mean acceleration for the test condition:

The mean acceleration a wot,(i) shall be mathematically rounded to the nearest second decimal place (e.g. XX.XX) and noted for further calculations.

1.4.3. Calculation of the gear weighting factor

The gear weighting factor k is used only in the case of a two-gear test to combine the results from both gears into a single result.

The gear weighting factor is a dimensionless number defined as:

1.4.4. Calculation of the partial power factor

The partial power factor k p is a dimensionless number used to combine the results of a full throttle acceleration test with those of a constant speed test.

1.4.4.1. For vehicles tested in two gears the partial power factor is defined as

1.4.4.2. For vehicles tested in a single gear or with the gear selector in one position the partial power factor is defined as:

If a wot,(i) is equal to or less than a urban, k p is set to zero.

1.4.5. Processing of the sound pressure measurements

For a given test condition, the three individual results of each side of the vehicle shall be averaged separately:

Where the index ‘mode’ refers to the test mode (full throttle acceleration or constant speed), ‘(i)’ to the gear and ‘side’ to the microphone position (left or right).

The higher value of the two averages shall be mathematically rounded to the nearest first decimal place (e.g. XX.X) and noted for further calculations:

L mode,(i) = MAX (L mode,(i),left; L mode,(i),right)

1.4.6. Calculation of the final test results

1.4.6.1. Vehicles with PMR ≤ 25

Vehicles with a PMR not exceeding 25 are tested in a single gear or gear selector position only under full throttle. The final test result is the sound pressure level L wot,(i) mathematically rounded to the nearest first decimal place (e.g. XX.X).

1.4.6.2. Vehicles with PMR > 25

If the vehicle was tested in two gears the gear weighting factor is used to calculate the test results of the full throttle acceleration tests and of the constant speed tests:

If the vehicle was tested in a single gear or gear selector position no further weighting is necessary:

L wot = L wot,(i)

L crs = L crs,(i)

The sound pressure level L urban representing urban driving is finally calculated using the partial power factor k p:

All sound pressure levels are mathematically rounded to the nearest first decimal place (e.g. XX.X).

2. Noise from stationary motor cycle (measuring conditions and method for testing of the vehicle in use).

2.1. Sound-pressure level in the immediate vicinity of the motor cycle

In order to facilitate subsequent noise tests on motor cycles in use, the sound-pressure level shall also be measured in the immediate vicinity of the exhaust-system outlet in accordance with the following requirements, the result of the measurement being entered in the communication referred to in Annex 1.

2.2. Measuring instruments

A precision sound level meter as defined in paragraph 1.2.1 shall be used.

2.3. Conditions of measurement

2.3.1. Condition of the motor cycle

The vehicle transmission shall be in neutral position and the clutch engaged, or in parking position for automatic transmission, and the parking brake applied for safety, if equipped.

The vehicle air conditioner, if equipped, shall be turned off.

If the vehicle is fitted with fan(s) having an automatic actuating mechanism, this system shall not be interfered with during the sound pressure level measurements.

The engine hood or compartment cover shall be closed.

Before each series of measurements, the engine shall be brought to its normal operating temperature, as specified by the manufacturer.

In case of a two-wheeled motor-driven vehicle having no neutral gear position, measurements shall be carried out with the rear wheel raised off the ground so that the wheel can rotate freely.

If it is necessary to raise a two-wheeled vehicle off the ground to perform the test, the microphone measurement position shall be adjusted to achieve the specified distance from the reference point of the exhaust pipe; see the figure for the location of the reference points.

2.3.2. Test site

A suitable test site shall be outdoors and consist of a level concrete, dense asphalt or similar hard material flat surface, free from snow, grass, loose soil, ashes or other sound-absorbing material. It shall be in an open space free from large reflecting surfaces, such as parked vehicles, buildings, billboards, trees, shrubbery, parallel walls, people, etc., within a 3 m radius from the microphone location and any point of the vehicle.

As an alternative to outside testing, a semi-anechoic chamber may be used. The semi-anechoic chamber shall fulfil the acoustical requirements given above. These requirements shall be met if the testing facility meets the 3 m distance criteria above and has a cut-off frequency below the lower of:

(a)	One-third-octave band below the lowest fundamental frequency of the engine during test conditions; and

(b)	100 Hz (2)

2.3.3. Miscellaneous

Readings of the measuring instrument caused by ambient noise and wind effects shall be at least 10 dB(A) lower than the sound levels to be measured. A suitable windshield may be fitted to the microphone provided that account is taken of its effect on the sensitivity of the microphone.

The tests shall not be carried out if the wind speed, including gusts, exceeds 5 m/s during the sound-measurement interval.

2.4. Method of measurement

2.4.1. Positioning of the microphone (see Appendix 2)

The microphone shall be located at a distance of 0,5 ± 0,01 m from the reference point of the exhaust pipe defined in the figure and at an angle of 45 ± 5° to the vertical plane containing the flow axis of the pipe termination. The microphone shall be at the height of the reference point, but not less than 0,2 m from the ground surface. The reference axis of the microphone shall lie in a plane parallel to the ground surface and shall be directed towards the reference point on the exhaust outlet.

The reference point shall be the highest point satisfying the following conditions:

(a)	The reference point shall be at the end of the exhaust pipe,

(b)	The reference point shall be on the vertical plane containing the exhaust outlet centre and the flow axis of the exhaust pipe termination.

If two microphone positions are possible, the location farthest laterally from the vehicle longitudinal centreline shall be used.

If the flow axis of the exhaust outlet pipe is at 90° ± 5° to the vehicle longitudinal centreline, the microphone shall be located at the point that is the furthest from the engine.

If a vehicle has two or more exhaust outlets spaced less than 0,3 m apart and connected to a single silencer, only one measurement shall be made. The microphone shall be located relative to the outlet the farthest from the vehicle’s longitudinal centreline, or, when such outlet does not exist, to the outlet that is highest above the ground.

For vehicles having an exhaust provided with outlets spaced more than 0,3 m apart, one measurement is made for each outlet as if it were the only one, and the highest sound pressure level shall be noted.

For the purpose of roadside checking, the reference point may be moved to the outer surface of the vehicle body.

Reference point

Text of image

2.4.2. Operating conditions

2.4.2.1. Target engine speed

The target engine speed is defined as

75 per cent of S for vehicles with S ≤ 5 000 min–1, and

50 per cent of S for vehicles with S > 5 000 min–1.

For a vehicle which cannot reach, in a stationary test, the target engine speed defined above, 95 per cent of the maximum engine speed reachable in a stationary test shall be used instead as target engine speed.

2.4.2.2. Test procedure

The engine speed shall be gradually increased from idle to the target engine speed and held constant within a tolerance band of ± 5 per cent. Then the throttle control shall be rapidly released and the engine speed shall be returned to idle. The sound pressure level shall be measured during a period consisting of constant engine speed of at least 1 s and throughout the entire deceleration period. The maximum sound level meter reading shall be taken as the test value.

A measurement shall be regarded as valid only if the test engine speed did not deviate from the target engine speed by more than the specified tolerance of ± 5 per cent for at least 1 s.

2.4.3. Multi-mode exhaust system

Vehicles equipped with a multiple mode, manually adjustable exhaust system shall be tested in all modes.

2.5. Results

2.5.1. The Communication referred to in Annex 1 shall indicate all relevant data and particularly those used in measuring the noise of the stationary motor cycle.

2.5.2. Measurements shall be made at the microphone location(s) prescribed above. The maximum A-weighted sound pressure level indicated during the test shall be noted, retaining one significant figure behind the decimal place (e.g. 92,45 shall be noted as to 92,5 while 92,44 shall be noted as to 92,4).

The test shall be repeated until three consecutive measurements that are within 2,0 dB(A) of each other are obtained at each outlet.

2.5.3. The result for a given outlet is the arithmetic average of the three valid measurements, mathematically rounded to the nearest integer value (e.g. 92,5 shall be noted as to 93 while 92,4 shall be noted as to 92).

2.5.4. For vehicles equipped with multiple exhaust outlets, the reported sound pressure level shall be for the outlet having the highest average sound pressure level.

2.5.5. For vehicles equipped with a multi-mode exhaust system and a manual exhaust mode control the reported sound pressure level shall be for the mode having the highest average sound pressure level.

3. Noise from the motor cycle in motion (data reported to facilitate testing of the vehicle in use).

3.1. A test procedure for in-use compliance tests may be defined by a Contracting Party, taking due account of any differences from the test conditions used at type-approval.

3.2. In order to facilitate in-use compliance test of motor cycles, the following information relating to the sound-pressure level measurements carried out in accordance with paragraph 1 of Annex 3 for the motor cycle in motion is referred to as in-use compliance reference data:

(a)	Gear (i) or, for vehicles tested with non-locked gear ratios, the position of the gear selector chosen for the test;

(b)	The pre-acceleration length l PA in m;

(c)	The average vehicle speed in km/h at the beginning of the full throttle acceleration for tests in gear (i); and

(d)	The sound pressure level L wot,(i) in dB(A) of the wide-open-throttle tests in gear (i), defined as the maximum of the two values resulting from averaging the individual measurement results at each microphone position separately.

3.3. The in-use compliance reference data shall be entered in the communication form conforming to Annex 1.

(1) Independent measurements of speed are when two or more separate devices will determine the values of vAA', vBB' and vPP'. A continuous measuring device such as radar will determine all required speed information with one device.

(2) The noise performance of indoor testing facilities is specified in terms of the cut-off frequency (Hz). This is the frequency above which the room can be assumed to act as a semi-anechoic space.

Appendix 1

Flowchart of the test procedure for the test of the vehicle in motion for vehicles of category L3 with PMR ≤ 25

Selection of highest (top) gear (in case of manual transmission)

Initial test speed vtest = 40 km/h

Acceleration pre-test with specified vPP' and gear

Yes

CVT or AT

Reduce vPP' by 10 per cent

vBB' ≤ 0,75 vmax and nBB' ≤ S

Yes

Shift to next lower gear

vBB' ≤ 0,75 vmax and nBB' ≤ S

Yes

Highest (top) gear

Yes

Reduce vPP' by 10 per cent

Acceleration test

Acceleration test with previous gear

Lurban

Appendix 2

Positioning of the microphones for the stationary noise test

Dimensions in metres, unless otherwise indicated

ANNEX 4

SPECIFICATIONS FOR THE TEST SITE

1. Introduction

This Annex describes the specifications relating to the physical characteristics and the laying of the test track. These specifications, based on a special standard (1), describe the required physical characteristics as well as the test methods for these characteristics.

2. Required characteristics of the surface

A surface is considered to conform to this standard provided that the texture and voids content or sound absorption coefficient have been measured and found to fulfil all the requirements of paragraphs 2.1 to 2.4 below and provided that the design requirements (paragraph 3.2) have been met.

2.1. Residual voids content

The residual voids content, VC, of the test track paving mixture shall not exceed 8 per cent. For the measurement procedure, see paragraph 4.1.

2.2. Sound absorption coefficient (2)

If the surface fails to conform to the residual voids content requirement, the surface is acceptable only if its sound absorption coefficient, α ≤ 0,10. For the measurement procedure, see paragraph 4.2. The requirement of paragraphs 2.1 and 2.2 is met also if only sound absorption has been measured and found to be α ≤ 0,10.

2.3. Texture depth

The texture depth (TD) measured according to the volumetric method (see paragraph 4.3 below) shall be:

TD ≥ 0,4 mm

2.4. Homogeneity of the surface

Every practical effort shall be taken to ensure that the surface is made to be as homogeneous as possible within the test area. This includes the texture and voids content, but it should also be observed that if the rolling process results in more effective rolling at some places than others, the texture may be different and unevenness causing bumps may also occur.

2.5. Periodic testing

In order to check whether the surface continues to conform to the texture and voids content or sound absorption requirements stipulated in this standard, periodic testing of the surface shall be done at the following intervals:

(a)

For residual voids content or sound absorption:

When the surface is new;

If the surface meets the requirements when new, no further periodical testing is required.

(b)

For texture depth (TD):

When the surface is new;

When the noise testing starts (NB: not before four weeks after laying);

Then every 12 months.

3. Test surface design

3.1. Area

When designing the test track layout it is important to ensure that, as a minimum requirement, the area traversed by the vehicles running through the test strip is covered with the specified test material with suitable margins for safe and practical driving. This will require that the width of the track is at least 3 m and the length of the track extends beyond lines AA and BB by at least 10 m at either end. Figure 1 shows a plan of a suitable test site and indicates the minimum area which shall be machine laid and machine compacted with the specified test surface material. According to paragraph 1.3.1 of Annex 3 measurements have to be made on each side of the vehicle. This can be made either by measuring with two microphone locations (one on each side of the track) and driving in one direction, or measuring with a microphone only on one side of the track but driving the vehicle in two directions. If the latter method is used, then there are no surface requirements on that side of the track where there is no microphone.

Figure 1

Minimum requirements for test surface area. The shaded part is called ‘Test Area’

3.2. Design and preparation of the surface

3.2.1. Basic design requirements

The test surface shall meet four design requirements:

3.2.1.1.

It shall be a dense asphaltic concrete.

3.2.1.2.

The maximum chipping size shall be 8 mm (tolerances allow from 6,3 to 10 mm).

3.2.1.3.

The thickness of the wearing course shall be ≥ 30 mm.

3.2.1.4.

The binder shall be a straight penetration grade bitumen without modification.

3.2.2. Design guidelines

As a guide to the surface constructor, an aggregate grading curve which will give desired characteristics is shown in Figure 2. In addition, the table gives some guidelines in order to obtain the desired texture and durability. The grading curve fits the following formula:

Where:

d	=	square mesh sieve size, in mm
dmax	=	8 mm for the mean curve
dmax	=	10 mm for the lower tolerance curve
dmax	=	6,3 mm for the upper tolerance curve

Figure 2

Grading curve of the aggregate in the asphaltic mix with tolerances

Per cent passing (by mass)

Sieve size in mm

In addition to the above, the following recommendations are given:

The sand fraction (0,063 mm < square mesh sieve size < 2 mm) shall include no more than 55 per cent natural sand and at least 45 per cent crushed sand;

The base and sub-base shall ensure a good stability and evenness, according to best road construction practice;

The chippings shall be crushed (100 per cent crushed faces) and of a material with a high resistance to crushing;

The chippings used in the mix shall be washed;

No extra chippings shall be added onto the surface;

The binder hardness expressed as PEN value shall be 40 – 60, 60 - 80 or even 80 - 100 depending on the climatic conditions of the country. The rule is that as hard a binder as possible shall be used, provided this is consistent with common practice;

The temperature of the mix before rolling shall be chosen so as to achieve by subsequent rolling the required voids content. In order to increase the probability of satisfying the specifications of paragraphs 2.1 to 2.4 above, the compactness shall be studied not only by an appropriate choice of mixing temperature, but also by an appropriate number of passings and by the choice of compacting vehicle.

Design guidelines

Quantity	Target values		Tolerances
Quantity	by total mass of mix	by mass of the aggregate	Tolerances
Mass of stones, square mesh sieve (SM) > 2 mm	47,6 %	50,5 %	± 5
Mass of sand 0,063 < SM < 2 mm	38,0 %	40,2 %	± 5
Mass of filler SM < 0,063 mm	8,8 %	9,3 %	± 2
Mass of binder (bitumen)	5,8 %	N.A.	± 0,5
Max. chipping size	8 mm		6,3 – 10
Binder hardness	(see paragraph 3.2.2(f))		—
Polished stone value (PSV)	> 50		—
Compactness, relative to Marshall compactness	98 %		—

4. Test method

4.1. Measurement of the residual voids content

For the purpose of this measurement, cores have to be taken from the track in at least four different positions which are equally distributed in the test area between lines AA and BB (see Figure 1). In order to avoid inhomogeneity and unevenness in the wheel tracks, cores should not be taken in wheel tracks themselves, but close to them. Two cores (minimum) should be taken close to the wheel tracks and one core (minimum) should be taken approximately midway between the wheel tracks and each microphone location.

If there is a suspicion that the condition of homogeneity is not met (see paragraph 2.4), cores shall be taken from more locations within the test area. The residual voids content has to be determined for each core, then the average value from all cores shall be calculated and compared with the requirement of paragraph 2.1. In addition, no single core shall have a voids value which is higher than 10 per cent. The test surface constructor is reminded of the problem which may arise when the test area is heated by pipes or electrical wires and cores shall be taken from this area. Such installations shall be carefully planned with respect to future core drilling locations. It is recommended to leave a few locations of size approximately 200 * 300 mm where there are no wires/pipes or where the latter are located deep enough in order not to be damaged by cores taken from the surface layer.

4.2. Sound absorption coefficient

The sound absorption coefficient (normal incidence) shall be measured by the impedance tube method using the procedure specified in ISO 10534:1994 – ‘Acoustics – Determination of sound absorption coefficient and impedance by a tube method.’

Regarding test specimens, the same requirements shall be followed as regarding the residual voids content (see paragraph 4.1). The sound absorption shall be measured in the range between 400 Hz and 800 Hz and in the range between 800 Hz and 1 600 Hz (at least at the centre frequencies of third octave bands) and the maximum values shall be identified for both of these frequency ranges. Then these values, for all test cores, shall be averaged to constitute the final result.

4.3. Volumetric macro texture measurement

For the purpose of this standard, texture depth measurements shall be made on at least 10 positions evenly spaced along the wheel tracks of the test strip and the average value taken to compare with the specified minimum texture depth. For the description of the procedure see standard ISO 10844:1994.

5. Stability in time and maintenance

5.1. Age influence

In common with any other surfaces, it is expected that the tyre/road noise level measured on the test surface may increase slightly during the first 6-12 months after construction.

The surface will achieve its required characteristics not earlier than four weeks after construction.

The stability over time is determined mainly by the polishing and compaction by vehicles driving on the surface. It shall be periodically checked as stated in paragraph 2.5.

5.2. Maintenance of the surface

Loose debris or dust which could significantly reduce the effective texture depth shall be removed from the surface. In countries with winter climates, salt is sometimes used for de-icing. Salt may alter the surface temporarily or even permanently in such a way as to increase noise and is therefore not recommended.

5.3. Repaving the test area

If it is necessary to repave the test track, it is usually unnecessary to repave more than the test strip (of 3 m width in Figure 1) where vehicles are driving, provided the test area outside the strip met the requirement of residual voids content or sound absorption when it was measured.

6. Documentation of the test surface and of tests performed on it

6.1. Documentation of the test surface

The following data shall be given in a document describing the test surface:

6.1.1.

The location of the test track.

6.1.2.

Type of binder, binder hardness, type of aggregate, maximum theoretical density of the concrete (DR), thickness of the wearing course and grading curve determined from cores from the test track.

6.1.3.

Method of compaction (e.g. type of roller, roller mass, number of passes).

6.1.4.

Temperature of the mix, temperature of the ambient air and wind speed during laying of the surface.

6.1.5.

Date when the surface was laid and contractor.

6.1.6.

All or at least the latest test results, including:

6.1.6.1.

The residual voids content of each core.

6.1.6.2.

The locations in the test area from where the cores for voids measurements have been taken.

6.1.6.3.

The sound absorption coefficient of each core (if measured). Specify the results both for each core and each frequency range as well as the overall average.

6.1.6.4.

The locations in the test area from where the cores for absorption measurement have been taken.

6.1.6.5.

Texture depth, including the number of tests and standard deviation.

6.1.6.6.

The institution responsible for the tests according to paragraphs 6.1.6.1 and 6.1.6.2 and the type of equipment used.

6.1.6.7.

Date of the test(s) and date when the cores were taken from the test track.

6.2. Documentation of vehicle noise tests conducted on the surface

In the document describing the vehicle noise test(s) it shall be stated whether all the requirements of this standard were fulfilled or not. Reference shall be given to a document according to paragraph 6.1 describing the results which verify this.

(1) ISO 10844:1994.

(2) The most relevant characteristic is the sound absorption, although the residual voids content is more familiar among road constructors. However, sound absorption needs to be measured only if the surface fails to conform to the voids requirement. This is because the latter is connected with relatively large uncertainties in terms of both measurements and relevance and some surfaces may therefore be rejected erroneously when the voids measurement only is used as a basis.

ANNEX 5

EXHAUST OR SILENCING SYSTEMS CONTAINING FIBROUS MATERIAL

1. Fibrous absorbent material shall be asbestos-free and may be used in the construction of the exhaust or silencing system only if suitable devices ensure that the fibrous material is kept in place for the whole time that the exhaust or silencing system is being used and the exhaust or silencing system meets the requirements of any one of paragraphs 1.1, 1.2 and 1.3:

1.1. After removal of the fibrous material, the sound level shall comply with the requirements of paragraph 6 of this Regulation.

1.2. The fibrous absorbent material may not be placed in those parts of the silencer through which the exhaust gases pass and shall comply with the following requirements:

1.2.1.

The material shall be heated at a temperature of 650 ± 5 °C for four hours in a furnace without reduction in every length, diameter or bulk density of the fibre.

1.2.2.

After heating at 650 ± 5 °C for one hour in a furnace, at least 98 per cent of the material shall be retained in a sieve of nominal aperture size 250 μm complying with ISO Standard 3310/1:1990 when tested in accordance with ISO Standard 2559:2000.

1.2.3.

The loss in weight of the material shall not exceed 10,5 per cent after soaking for 24 hours at 90 ± 5 °C in a synthetic condensate of the following composition (1):

1 N hydrobromic acid (HBr): 10 ml

1 N sulphuric acid (H2SO4): 10 ml

Distilled water to make up to 1 000 ml

1.3. Before the system is tested in accordance with Annex 3, it shall be put into a normal state for road use by one of the following condition methods:

1.3.1. Conditioning by continuous road operation

1.3.1.1.

According to the classes of motor cycles, the minimum distances to be completed during conditioning are:

Class of motor cycle according to Power-to-Mass Ratio index (PMR)	Distance (km)
Class I ≤ 25	4 000
Class II > 25 ≤ 50	6 000
Class III > 50	8 000

1.3.1.2.

50 ± 10 per cent of this conditioning cycle consists of town driving and the remainder of long-distance runs at high speed; the continuous road cycle may be replaced by a corresponding test-track programme.

1.3.1.3.

The two speed regimes shall be alternated at least six times.

1.3.1.4.

The complete test programme shall include a minimum of 10 breaks of at least three hours’ duration in order to reproduce the effects of cooling and condensation.

1.3.2. Conditioning by pulsation

1.3.2.1.

The exhaust system or components thereof shall be fitted to the motor cycle or to the engine. In the former case, the motor cycle shall be mounted on a test bench.

The test apparatus, a detailed diagram of which is shown in the figure, is fitted at the outlet of the exhaust system. Any other apparatus providing equivalent results is acceptable.

1.3.2.2.

The test equipment shall be adjusted so that the flow of exhaust gases is alternatively interrupted and restored 2 500 times by a rapid-action valve.

1.3.2.3.

The valve shall open when the exhaust gas back-pressure, measured at least 100 mm downstream of the intake flange, reaches a value of between 35 and 40 kPa. Should such a figure be unattainable because of the engine characteristics, the valve shall open when the gas back-pressure reaches a level equivalent to 90 per cent of the maximum that can be measured before the engine stops. It shall close when this pressure does not differ by more than 10 per cent from its stabilised value with the valve open.

1.3.2.4.

The time-delay switch shall be set for the duration of exhaust gases calculated on the basis of the requirements of paragraph 1.3.2.3.

1.3.2.5.

Engine speed shall be 75 per cent of the rated engine speed (S).

1.3.2.6.

The power indicated by the dynamometer shall be 50 per cent of the full-throttle power measured at 75 per cent of the rated engine speed (S).

1.3.2.7.

Any drainage holes shall be closed off during the test.

1.3.2.8.

The entire test shall be complete within 48 hours. If necessary, a cooling period shall be allowed after each hour.

1.3.3. Conditioning on a test bench

1.3.3.1.

The exhaust system shall be fitted to an engine representative of the type fitted to the motor cycle for which the exhaust system was designed, and mounted on a test bench.

1.3.3.2.

Conditioning consists of the specific number of test bench cycles for each class of motor cycle for which the exhaust system was designed. The number of cycles for each class of motor cycle is:

Class of motor cycle according to Power-to-Mass Ratio index (PMR)	Number of cycles
Class I ≤ 25	6
Class II > 25 ≤ 50	9
Class III > 50	12

1.3.3.3.

Each test-bench cycle shall be followed by a break of at least six hours in order to reproduce the effects of cooling and condensation.

1.3.3.4.

Each test-bench cycle consists of six phases. The engine conditions for and the duration of each phase are:

Phase	Conditions	Duration of phase in minutes
Phase	Conditions	PMR ≤ 50	PMR > 50
1	Idling	6	6
2	25 % load at 75 % S	40	50
3	50 % load at 75 % S	40	50
4	100 % load at 75 % S	30	10
5	50 % load at 100 % S	12	12
6	25 % load at 100 % S	22	22
	Total time	2,5 hours	2,5 hours

1.3.3.5.

During this conditioning procedure, at the request of the manufacturer, the engine and the silencer may be cooled in order that the temperature recorded at a point not more than 100 mm from the exhaust gas outlet does not exceed that measured when the motor cycle is running at 110 km/h or 75 per cent of S in top gear. The engine and/or motor cycle speeds are determined to within ± 3 per cent.

Test apparatus for conditioning by pulsation

Notes:

(1) The material shall be washed in distilled water and dried for one hour at 105 °C before weighing.

ANNEX 6

MAXIMUM LIMITS OF SOUND LEVELS

Category	Power-to-mass ratio index (PMR)	Limit value for Lurban in dB(A)
First category	PMR ≤ 25	73
Second category	25 < PMR ≤ 50	74
Third category	PMR > 50	77 (1)

(1) For motor cycles tested in second gear only in Annex 3, the limit value is increased by 1 dB(A) until the date in paragraph 12.7. Data for affected vehicles shall be studied, and discussions shall be made in case of further extension.

ANNEX 7

ADDITIONAL SOUND EMISSION PROVISIONS (ASEP)

1. Scope

1.1. This Annex applies to vehicles of category L3 with PMR > 50.

1.2. Vehicles with variable gear ratios or automatic transmission with non-lockable gear ratios are exempted from the requirements of this Annex, if the vehicle manufacturer provides technical documents to the Type Approval Authority showing, that the vehicle’s engine speed at BB' does neither exceed

nor fall below

for any test condition inside the ASEP control range defined in paragraph 2.5 below, where n BB' is the average engine speed at BB' from the three valid acceleration tests according to paragraph 1 of Annex 3.

2. Additional sound emission requirements

2.1. Measuring instruments

The requirements for the measurement equipment are identical to those defined in paragraph 1.1 of Annex 3 for the tests of the motor cycle in motion.

2.2. Acoustical environment, meteorological conditions and background noise

The requirements concerning the acoustical environment, the meteorological conditions and the background noise are identical to those defined in paragraph 1.2 of Annex 3 for the tests of the motor cycle in motion.

2.3. Microphone positions and conditions of the vehicle

The requirements concerning the microphone positions and the conditions of the vehicle are identical to those defined in paragraphs 1.3.1 and 1.3.2 of Annex 3 for the tests of the motor cycle in motion.

2.4. General operating conditions

The general operating conditions are identical to those defined in paragraph 1.3.3.1 of Annex 3 for the tests of the motor cycle in motion.

2.5. ASEP control range

The requirements of this Annex apply to any vehicle operation with the following restrictions:

(a)	v AA' shall be at least 20 km/h

(b)	v BB' shall not exceed 80 km/h

(c)	n AA' shall be at least

(d)

n BB' shall not exceed

for PMR ≤ 66 and

for PMR > 66

2.6. ASEP limits (1)

The maximum noise level recorded during the passage of the motorcycle through the test track shall not exceed:

for n PP' < n wot,(i) and

for n PP' ≥ n wot,(i)

From the date in paragraph 12.7, maximum noise level shall not exceed:

for n PP' < n wot,(i) and

for n PP' ≥ n wot,(i)

Where L wot,(i) and nPP' have the same meaning as in paragraph 1 of Annex 3 and n wot,(i) refers to the corresponding engine speed when the front of the vehicle passes the line PP'.

3. Testing compliance by measurements

3.1. General

The Type Approval Authority as well as the Technical Service may request tests to check the compliance of the motorcycle with the requirements of paragraph 2 above. To avoid undue work load testing is restricted to the reference points defined in paragraph 3.2 below and up to two additional operating conditions other than the reference points but inside the ASEP control range.

3.2. ASEP reference test conditions

3.2.1. Test procedure

When the front of the vehicle reaches AA', the throttle shall be fully engaged and held fully engaged until the rear of the vehicle reaches BB'. The throttle shall then be returned as quickly as possible to the idle position. Pre-acceleration may be used if acceleration is delayed beyond AA'. The location of the start of the acceleration shall be reported.

3.2.2. Test speed and gear selection

The vehicle shall be tested at each of the following operating conditions:

(i)	v PP' = 50 km/h The selected gear (i) and pre-acceleration condition shall be the same as those used in the original type approval test of Annex 3 of this Regulation.

(ii)

v BB' corresponding to

for PMR ≤ 66; and

for PMR > 66

v BB' shall not exceed 80 km/h

The selected gear shall be second. If the third gear satisfies requirements of n BB' and v BB', third shall be used. If the fourth gear satisfies requirements of n BB' and v BB', fourth shall be used.

3.2.3. Data processing and reporting

The requirements of paragraph 1.4 of Annex 3 shall be applied.

In addition the engine speed measurements at AA', BB', and PP' in units of min– 1 shall be mathematically rounded to the nearest integer for further calculations. For a given test condition the three individual engine speeds shall be averaged arithmetically.

The final sound pressure levels for the full throttle acceleration shall not exceed the limits specified in paragraph 2.6 above.

(1) When compliance with these limits is checked, values for L wot(i) and n wot(i) shall not be taken from type approval documents but newly determined by measurements as defined in paragraph 1 of Annex 3, however using the same gear (i) and the same pre-acceleration distance as during type approval.

ANNEX 8

STATEMENT OF COMPLIANCE WITH THE ADDITIONAL SOUND EMISSION PROVISIONS (ASEP)

(Maximum format: A4 (210 x 297 mm))

… (Name of manufacturer) attests that vehicles of this type … (type with regard to its noise emission pursuant to Regulation No 41) comply with the requirements of paragraph 6.3 of Regulation No 41.

… (Name of manufacturer) makes this statement in good faith, after having performed an appropriate evaluation of the sound emission performance of the vehicles.

Date: …

Name of authorised representative: …

Signature of authorised representative: …

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