Indoor Pass-by noise testing on a roller test bench in a small anechoic chamber with an isotropic source

摘要

The pass-by noise is a specific domain which has to be discussed in the context of NVH. It isnecessary for the homologation of every vehicle. In fact of weather conditions etc. there isan effort to transfer the pass-by noise measurement onto an acoustic roller test bench.Therefore an acoustic chamber in the size of the ISO track is discussed in the standards.Those chambers are very expensive and often not possible because of the infrastructure.The anechoic chamber at the IPEK – Institute of Product Engineering at KIT includes afour wheel roller test bench and is not approving the ISO 362 track dimensions.At the Internoise 2011 some measurements where shown, discussing the acousticaldamping of the measurements of the different positioned microphones. The result,calculated by the law of distance, was an inhomogeneous allocation.In this contribution pass-by measurement results in a small anechoic chamber with a pointsource are discussed. With it the acoustical damping of the chamber and the calculation ofthe microphone position were validated. So the base is set for the next steps to develop anidle adaptable measurement setup for small acoustic chambers.