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. 1.
    Variation in engine surface vibration and noise radiated is linearly related to a force input applied to the structure.
  2. 2.
    A method of predicting combustion noise levels of current automotive diesel engines.
  3. 3.
    A combination of engine performance calculations with relations for predicting overall engine noise in initial design stages.

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