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Using Mechanical-Acoustic Reciprocity for Diagnosis of Structure Borne Sound in Vehicles
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English
Abstract
The low frequency interior noise in cars is for a large part the result of structure borne excitation. The transfer of the structure borne sound involves a large number of components of the engine suspension, wheel suspension and chassis which are all potentially contributing to the overall noise level. This process can be analyzed through a combination of transfer function measurements with operational measurements under normal conditions.
This technique, called transfer path analysis, requires large numbers of transfer function measurements with excitation of the body or cabin at the rubber mountings. Unfortunately, bad access to these crucial measurement locations causes either high instrumentation and measurement effort or less accurate measurement data.
The practicality and quality of the measurements can be improved by using reciprocal measurements for the mechano-acoustic transfer of the body or cabin structure; a loudspeaker in the cavity is used for the reciprocal excitation. The reciprocity technique also allows better insight in the acoustic response of the cavity.
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Authors
Citation
van der Linden, P. and Fun, J., "Using Mechanical-Acoustic Reciprocity for Diagnosis of Structure Borne Sound in Vehicles," SAE Technical Paper 931340, 1993, https://doi.org/10.4271/931340.Also In
References
- HENDRICX, W. DE VIS D. VAN DER LINDEN, PJG Development and integration of an advanced unified approach to structure borne noise analysis” ATA Conference on Vehicle Confort Bologna 14-16/10/1992
- VERHEIJ, J.W. Multipath sound transfer from resiliently mounted shipboard machinery Ph.D. Thesis Technische Physische Dienst TNO-TH Delft 1982
- FAHY, F.J. The reciprocity principle and applications in vibro-acoustics Proceedings of the second international congress on recent developments in air-and structure-borne sound and vibration 1992 p 611 618
- VERHEIJ, J.W. Experimental procedures for quantifying sound paths to the interior of road vehicles Proceedings of the Second International Conference on Vehicle Comfort October 14-16 1992 Bologna 483 491
- KENDRICX, W. VANDENBROECK, D. Suspension analysis in view of road optimisation Proceedings of the SAE 1993 Conference Traverse City 10-13 05 1993