Title: Reducing exhaust system noise in heavy truck design

Authors: M. Inagawa, K. Nakamura

Addresses: Vehicle Research Section, Mitsubishi Motors Corporation, Kawasaki-shi, Japan. ' Vehicle Research Section, Mitsubishi Motors Corporation, Kawasaki-shi, Japan

Abstract: Traffic noise in urban areas is posing a serious problem in many countries of the world, and the reduction of noise in heavy trucks is now a social problem urgently requiring resolution. Four major heavy truck manufacturers have been conducting joint research on the reduction of noise in heavy trucks under the leadership of the Japanese Ministry of International Trade and Industry as a three-year project. The Mitsubishi Motors Corporation is in charge of the reduction of exhaust system noise, which is one of the main sources of vehicle noise. The exhaust system noise of trucks can be divided into discharge noise emitted from the exhaust outlet and radiated noise emanating from the surface of the exhaust pipes and mufflers. This paper reports on the results of experiments performed on the reduction of the exhaust noise of actual trucks on the basis of the results of basic studies, including acoustic studies and studies of air flow noise and radiated noise.

Keywords: exhaust systems; exhause noise; noise reduction; acoustic attenuation characteristics; gas stream noise; expansion mufflers; resonator mufflers; multi-hold mufflers; acoustic tests; flow generated noise tests; radiated noise tests; random vibration; trucks; vehicle noise.

DOI: 10.1504/IJVD.1981.061255

International Journal of Vehicle Design, 1981 Vol.2 No.2, pp.127 - 144

Published online: 25 May 2014 *

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