1973-01-08

Influence of Operating Cycle on Noise of Diesel Engines 730241

The fundamental effect that cycle difference of a reciprocating internal combustion engine has on noise and performance, together with noise and vibration characteristics of 2- and 4-cycle diesel engines, is described.Some of the conclusions drawn from extensive noise and vibration measurements include: 1.Variation in engine surface vibration and noise radiated is linearly related to a force input applied to the structure. 2.A method of predicting combustion noise levels of current automotive diesel engines. 3.A combination of engine performance calculations with relations for predicting overall engine noise in initial design stages.

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