Browse Publications Technical Papers 2015-26-0122
2015-01-14

Pass by Noise Engineering Solutions - Beyond Homologation 2015-26-0122

Certification of vehicle noise emissions for passenger vehicles, motorcycles and light trucks is achieved by measuring external sound levels according to procedures defined by international standards such as ISO362. The current procedure based on a pass-by test during wide-open throttle acceleration is believed far from actual urban traffic conditions.Hence a new standard pass-by noise certification is being evaluated for implementation. It will put testing departments through their paces with requirements for additional testing under multiple ‘real world’ conditions. The new standard, together with the fact that most governments are imposing lower noise emission levels, make that most of the current models do not meet the new levels which will be imposed in the future. Therefor automotive manufacturers are looking for new tools which are giving them a better insight in the Pass-by Noise contributors.An advanced acoustic testing/analysis approach referred to as PBN Engineering is detailed which will help to arrive at the source contribution plots during the Pass by noise testing. Such a method and its results enables engineers to design subsystems, assemblies and individual components so the vehicle meets noise emission requirements targets set early in development. The approach is illustrated with case studies.

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