Reduction of combustion noise and structural improvement of its transmission path in diesel engine design
by Y. Watanabe
International Journal of Vehicle Design (IJVD), Vol. 2, No. 3, 1981

Abstract: In order to provide a quieter diesel engine as an essential component of low-noise trucks. A two-year investigation of combustion noise and engine structural analysis was carried out. Influences of various variables related to combustion noise were observed on a Vee type two-cylinder engine, and the variables which seemed to be effective for noise control were confirmed on a multi-cylinder engine. Structural analysis was advanced by using improved measuring techniques such as applications of laser holography, transfer function and F.F.T. Furthermore, the adoption of accelerated running simulation on an eddy-current dynamometer made noise evaluation possible in an engine operating condition that was dose to the actual vehicular situation. The target figure of engine noise reduction, 2 to 4 dB(A), could be almost achieved by cylinder block structural modification and turbo-charging or by increasing the compression ratio for N.A. engines. Engine noise control techniques so far found effective and their problems are also discussed at the end of the paper.

Online publication date: Sun, 25-May-2014

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