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GB 1495-2002 PDF English

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GB 1495-2002: Limits and measurement methods for noise emitted by accelerating motor vehicles
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GB 1495: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB 1495-2002English145 Add to Cart 0-9 seconds. Auto-delivery Limits and measurement methods for noise emitted by accelerating motor vehicles Valid
GB 1495-1979English199 Add to Cart 2 days Permissible noise limit emitted by power-driven vehicles Obsolete

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GB 1495-2002: Limits and measurement methods for noise emitted by accelerating motor vehicles

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 13.140 Z 32 Replacing GB 1495, partially replacing GB 1496-79 Limits and measurement methods for noise emitted by accelerating motor vehicles Issued on. JANUARY 04, 2002 Implemented on. OCTOBER 01, 2002 Issued by. State Environmental Protection Administration; General Administration of Quality Supervision, Inspection and Quarantine.

Table of Contents

Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Definitions... 5 4 Noise limit... 6 5 Measurement methods... 7 Annex A (standard) Measurement methods for noise emitted by accelerating motor vehicles... 8 Annex AA Requirements for noise measurement test road... 15 Annex AB Record of measurement for noise emitted by accelerating motor vehicles... 23

Foreword

This Standard was formulated in accordance with Law of the People's Republic of China on Prevention and Control of Pollution from Environmental Noise. This Standard referred to United Nations Economic Commission for Europe Regulation ECE Reg. No. 51 “Uniform provisions concerning the approval of motor vehicles having at least four wheels with regard to their noise emissions” and was based on the actual situation of China's automotive products. The noise limit of this Standard replaces the car noise limit in GB 1495-79. On the noise measurement methods, in technical contents, this Standard referred to Annex 3 of United Nations Economic Commission for Europe Regulation ECE Reg. No. 51/02 (1997) “Uniform provisions concerning the approval of motor vehicles having at least four wheels with regard to their noise emissions” and corresponding content in the International standard ISO 362.1998 “Acoustics -- Measurement of noise emitted by accelerating road vehicles -- Engineering method”. The requirements for test road in this Standard equivalently adopted ISO 10844.1994 “Acoustics -- Specification of test tracks for the purpose of measuring noise emitted by road vehicles”. It shall be implemented since January 1, 2005. This Standard shall be implemented in two time periods according to the auto exit-factory dat. This Standard was proposed by State Environmental Protection Administration, Science and Technology Standard Department. The drafting organizations of this Standard. Beijing Labor Protection Science Research Institute, China Automotive Technology and Research Center. This Standard was approved by State Environmental Protection Administration on November 22, 2001. This Standard shall be interpreted by State Environmental Protection Administration. Limits and measurement methods for noise emitted by accelerating motor vehicles

1 Scope

This Standard specifies the limits for noise emitted by accelerating new produced motor vehicles. This Standard specifies the measurement methods for noise emitted by accelerating new produced motor vehicles. This Standard is applicable to Category-M and Category-N1 motor vehicles.

2 Normative references

The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. GB 3785-83, Electroacoustics - Sound level meters GB/T 15173-94, Sound calibrators GB/T 12534-90, Motor vehicles - General rules of road test method ISO 10844-1994, Acoustics - Specification of test tracks for the purpose of measuring noise emitted by road vehicles 2 ISO 10534 1996, Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1.Method using standing wave ratio 3 GB/T 17692-1999, Measurement methods of net power for automotive engines

3 Definitions

For the purposes of this document, the following definitions apply. 3.1 Motor vehicle’s category In terms of noise outside the motor vehicle, a category of motor vehicle refers to a category of motor vehicles that have no difference in the following main aspects. 3.1.1 Body shape or structural material (especially the engine compartment and its sound insulation material). 3.1.4 Drive train, gear number and its speed ratio. 3.1.5 Noise reduction system or components as defined in 3.2 and 3.3 below. 3.2 Noise reduction system Noise reduction system refers to the complete set of components necessary to limit the motor vehicle and its exhaust noise. When the noise reduction component’s designations or trademarks in the system are different, or the size and shape of the components, material properties, assembly, working principle are different, or the number of intake/exhaust mufflers is different, the system shall be regarded as different types of noise reduction systems. 3.3 Noise reduction system components The noise reduction system component refers to one of the individual components that constitute the noise reduction system, such as the exhaust pipe, the expansion chamber, the muffler, etc. It is considered a component of the noise reduction system when the presence of the air filter is essential to ensure that the specified noise limits are met.

4 Noise limit

When the vehicle accelerates, the maximum noise level outside the vehicle shall not exceed the limits specified in Table 1.

5 Measurement methods

The measurements for noise emitted by accelerating motor vehicles shall be performed according to Annex A.

Annex A

(Normative) Measurement methods for noise emitted by accelerating motor vehicles A.1 Measuring instruments A.1.1 Acoustic measurement A.1.2 Measurements of rotating speed, vehicle speed An engine tachometer or vehicle speed measuring instrument with an accuracy better than ±2% must be used to monitor the rotating speed or vehicle speed. Do not use the same type of instrument on the vehicle. A.1.3 Meteorological parameter measurement The accuracy of the thermometer shall be within ±1°C. The accuracy of the anemometer shall be within ±1.0 m/s. A.1.4 All measuring instruments shall be periodically inspected in accordance with the relevant national standards for measuring instruments. A.2 Measuring conditions A.2.1 Measuring site ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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