Title: An evaluation of friction and impact induced acoustic behaviour of selected automotive materials, Part II: impact induced acoustics

Authors: Martin A. Trapp, Kathleen K. Hodgdon

Addresses: Ford Motor Co, 20800 Oakwood Blvd, Dearborn, MI 48121, USA. ' 216 ARL, Penn State, University Park, PA 16802, USA

Abstract: Rattle/impact induced noises represent an automotive industry concern because they affect both the consumer|s perception and warranty expense. This paper attempts to evaluate impact induced noise. The mechanical properties of Polypropylene (PP), Aluminum (Al), Magnesium (Mg), steel, brass, and Polyamide 66 (nylon 66) (PA or PA66) samples were determined and rated against their acoustic signature when subjected to an impact event. Next, the sound recordings were used in a jury study to compare rattle behaviour and the loudness metric of N5 in sones was the single factor that had the best subjective to objective correlation.

Keywords: impact induced noise; contact stiffness; Zwicker loudness; friction test apparatus; slider; sound spectra; subjective noise evaluation; automotive materials; vehicle noise; rattle behaviour; automobile industry; acoustic signature.

DOI: 10.1504/IJVNV.2008.020109

International Journal of Vehicle Noise and Vibration, 2008 Vol.4 No.1, pp.17 - 34

Available online: 26 Aug 2008 *

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