DIN/VDI Standards Committee Acoustics, Noise Control and Vibration Engineering
Acoustics - Measurement of sound emitted by road vehicles of category M and N at standstill and low speed operation - Engineering method; Text in German and English
This document is derived from ISO 362-1 and specifies an engineering method for measuring the sound emitted by M and N category road vehicles at standstill and low speed operating conditions. The specifications reproduce the level of sound which is generated by the principal vehicle sound sources consistent with stationary and low speed vehicle operating conditions relevant for pedestrian safety. 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 acoustic environment which is only obtained in an extensive open space. Such conditions usually exist during the following:
- measurements of vehicles for regulatory certification; - measurements at the manufacturing stage; - measurements at official testing stations. The results obtained by this method give an objective measure of the sound emitted under the specified conditions of test. In addition, this International Standard provides an engineering method to measure the performance of external sound generation systems intended for the purpose of providing acoustic information to pedestrians on a vehicle's operating condition. This information provide objective criteria related to the external sound generation system's sound pressure level, frequency content, and changes in sound pressure level and frequency content as a function of vehicle speed. As such, these measures can provide pedestrians with information on the location, speed, acceleration, and deceleration behaviour of a vehicle.
Planned document number
DIN ISO 16254