騒音波形解析によるエンジンの故障診断

概要

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Diagnosis of engine trouble has been performed by measuring the various pressures and temperatures in a running engine. It is often impossible to locate engine trouble with this method. In certain cases, a skilled mechanic may find machine problems by listening to the sound made by the components suspected of causing the trouble; but only by removing and evaluating these components, can be make his hypothesis. In this paper, the means of analysis and discrimination of the engine noise are investigated to diagnose engine troubles. In terms of engine troubles, we have chosen two cases : the first is an increase of clearance between the exhaust valve and the rockerarm; the second involves a blow-by phenomenon through a slit on a valve. The experiments were carried out on two different types of engines. It then becomes possible to know where the trouble occurs and its cause by investigating the generation time, the power spectrum of noise in each time segment, and the distribution pattern of the spectra.
山口大学の論文