Abstract

VON GOSIER, Joring  and  VAN NIEKERK, Johannes L. Sound Quality Metrics to Assess Road Noise in Light Commercial Vehicle. R&D j. (Matieland, Online) [online]. 2008, vol.24, pp.1-25. ISSN 2309-8988.

This study investigated the interior sound quality (SQ) of light commercial vehicles (LCVs). In particular the road/tyre noise component was used to investigate the correlation of objective SQ metrics with subjective ratings of loudness and annoyance in order to develop benchmarks for SQ. Sound measurements were done in a selection of L CVs and two small sedans to obtain representative sounds quality. A16 member jury provided subjective evaluations of the measured sounds. The metrics, Zwicker loudness and Aure sharpness, were found to correlate strongly with vehicle speed as well as with the road surface roughness. Loudness and sharpness increases linearly with vehicle speed. Loudness was found to be around 25% higher and sharpness around 5.6% lower for vehicles driving on rough tar roads than driving on smooth tar roads. Good correlation was found between the subjective evaluation of annoyance and loudness and the calculated metrics of Zwicker loudness and Aure sharpness indicating that these two metrics can indeed be used as benchmarks when developing new models.

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