Title: Study on effective application of soundproofing materials through low noise prototype car development

Authors: T. Kitahara, I. Terada, T. Watanabe

Addresses: Manager, Noise and Vibration Lab., Isuzu Motors Ltd., Fujisawa-shi, Japan. ' Engineer, Noise and Vibration Lab., Isuzu Motors Ltd., Fujisawa-shi, Japan. ' Manager, Engineering Dept., Nippon Rubber Co. Ltd., Saitama-ken, Japan

Abstract: An experimental study on an effective interior noise induction method was executed through the construction of allow noise prototype car which mainly involved applying noise insulation materials to the Gemini Diesel as a base car. The process employed and the results obtained are described in the following: 1. Investigation on base car and determination of prototype car target. The most efficient noise insulation measures were sought taking the results of body acoustic and vibration characteristics measurements into consideration. It was found that the application laying importance on the most contributive panel area, full covering to seal split of bare panel, and choice of insulation materials were important for obtaining effective noise reduction. At least 3 dB(A) interior noise reduction was targeted. 2. Construction and evaluation of low noise prototype car. One piece formed type insulation materials having appropriate frequency characteristics were applied with the tight scaling of panel joint split. An interior noise reduction of 4-6dB(A) was achieved consequently. 3. Improvement in vibration transmission routes and noise source. After the amount of vibration damper was reduced through the improvement in mounting rubber characteristics being intended to reduce solid borne noise and also sound insulation was reduced by lowering source noise levels, 38 kg mass reduction was achieved.

Keywords: acoustical experiments; car body; airborne sound; soundproofing materials; low-noise prototype car; noise insulation materials; solid borne sound; vibration dampers; vibration isolator; vehicle noise.

DOI: 10.1504/IJVD.1984.061108

International Journal of Vehicle Design, 1984 Vol.5 No.4, pp.490 - 504

Published online: 25 May 2014 *

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