BS ISO 362-1:2015

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols terms and abbreviated terms
5 Specification of the acceleration for vehicles
  of categories M1 and M2 having a maximum
  authorized mass not exceeding 3500 kg and
  of category N1
6 Instrumentation
7 Acoustical environment, meteorological
  conditions, and background noise
8 Test procedures
9 Test report
Annex A (informative) - Technical background for
        development of vehicle noise test procedure
        based on in-use operation in urban conditions
Annex B (informative) - Measurement uncertainty - Framework
        for analysis according to ISO/IEC Guide 98-3 (GUM)
Annex C (informative) - Flowchart of the procedure
        for categories M1 and M2 having a maximum
        authorized mass not exceeding 3500 kg and
        category N1
Annex D (informative) - Flowchart for vehicles of category
        M2 having a maximum authorized mass exceeding
        3500 kg and categories M3, N2, and N3 with locked gears
Annex E (informative) - Flowchart for vehicles of category
        M2 having a maximum authorized mass exceeding
        3500 kg and categories M3, N2, and N3 with non-locked
        gears
Annex F (informative) - Flowchart for vehicles of category M2
        having a maximum authorized mass exceeding 3500 kg and
        categories M3, N2, and N3 with no rotational engine
        speed available
Annex G (informative) - Indoor test operation
Bibliography

Describes an engineering method for measuring the noise emitted by road vehicles of categories M and N under typical urban traffic conditions.

This part of ISO362 specifies an engineering method for measuring the noise emitted by road vehicles of categories M and N under typical urban traffic conditions. It excludes vehicles of category L1 and L2, which are covered by ISO9645 , and vehicles of category L3, L4, and L5, which are covered by ISO362‑2 . The specifications are intended to reproduce the level of noise generated by the principal noise sources during normal driving in urban traffic (see AnnexA). The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle. The test method requires an acoustical environment that is obtained only in an extensive open space. Such conditions are usually provided for type approval measurements of a vehicle, measurements at the manufacturing stage, and measurements at official testing stations. NOTE1 The results obtained by this method give an objective measure of the noise emitted under the specified conditions of test. It is necessary to consider the fact that the subjective appraisal of the noise annoyance of different classes of motor vehicles is not simply related to the indications of a sound measurement system. As annoyance is strongly related to personal human perception, physiological human conditions, culture, and environmental conditions, there is a large variation and it is, therefore, not useful as a parameter to describe a specific vehicle condition. NOTE2 Spot checks of vehicles chosen at random are rarely made in an ideal acoustical environment. If measurements are carried out on the road in an acoustical environment that does not fulfil the requirements stated in this part of ISO362 , the results obtained can deviate appreciably from the results obtained using the specified conditions.