GB 1495-2002Limits and measurement methods for noise emitted by accelerating motor vehicles (English PDF)

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

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.

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

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