Standard No.:	GB/T 22036-2017
Chinese Name:	轮胎惯性滑行通过噪声测试方法
English Name:	Coast-by methods for measurement of tyre-to-road sound emission
Professional Classification:	G41 Tyre
ICS Classification:	83.160.10 Road vehicle tyres
Issued by:
Issued on:	2017-12-29
Implemented on:	2018-11-01
Status:	VALID
Replace:	GB/T22036-2008 Coast-by methods for measurement of tyre-to-road sound emission
Language:	English
File Format:	PDF
Word Count:	10000 words
Price(USD):	300 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This standard specifies methods for measuring tyre-to-road sound emissions from tyres fitted on a motor vehicle or towed trailer under coast-by conditions, i.e. when the vehicle or trailer is in free-rolling, non-powered operation, with transmission in the neutral position and the engine as well as all auxiliary systems not necessary for safe driving switched off. Whereas the results of the vehicle method are closer to the tyres sound than those of hat the trailer method, the tyre sound is affected by suspension; the test results of trailer method can be even closer to sound emissions produced by the tyres alone.

This standard is applicable to new tyres of passenger cars and trucks. It is neither applicable to determine the sound contribution (sound field distribution) of tyres of vehicles running in normal condition nor to the determination of traffic sound and its damage degree at a given location.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 3785.1-2010 Electroacoustics - Sound level meters - Part 1 Specification (IEC 61672-1:2002, IDT)
GB/T 6326 Tyre terms and definitions (GB/T 6326-2014, ISO 4223-1:2002, Definitions of some terms used in tyre industry - Part 1: Pneumatic tyres, NEQ)
GB/T 15173-2010 Electroacoustics - Sound calibrators (IEC 60942:2003, IDT)
ISO 362.1 Measurement of noise emitted by accelerating road vehicles - Engineering method - Part 1: M and N categories
ISO 10844 Acoustics - Specification of test tracks for measuring noise emitted by road vehicles and their tyres

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T 6326 apply.

4 General

This standard is applicable to measurement of sound emitted from the tyre of a test motor vehicle (see Annex A) or trailer (see Annex B) in coast-by conditions.

The test results are an objective measure of the sound emitted under the prescribed conditions of the test, i.e. A-weighted sound pressure level.