Impulse Response and Radiated Noise in an Air-Cooled Small Engine

概要

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A frequency analysis technique is proposed to identify various vibrations and noises induced by many impacts in a running engine. The frequency spectra of the vibration and noise which correspond to each impact in a particular time segment within one cycle are discussed by using this technique. According to the result, this technique makes it possible to obtain accurate frequency characteristics of noise radiated in each time segment and the contribution ratio to the total engine noise, and to deduce the band frequency components of vibration and noise which are correlated to each impact produced in the engine structure. Thus it is shown that the analysis technique proposed in this paper gives an effective means to clarify the mechanisms of the engine noise generation.
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