Diagnosis System of Diesel Engine by Statistical Vibration Analysis

Abstract

In order to prevent an accident of an engine. Various systems to watch engine condition is necessary. We reported it with our paper already about a diagnosis system to use a sound. This paper describes the system which abnormal condition of engine is diagnosed by its vibration.
Abnormal condition of the engine because of vibration was made to occur as being artificial in crankcase of engine. The vibration occurs, when connectingrod-large-end comes in contact with the thin metal board that was attached as taking it inside crankcase. The vibration was detected by means of a vibration sensor on the surface of engine frame. A statistical analysis was done against the spectral data of vibration signal. and a detection of an abnormal condition was enforced.
It was proved its result. to be able to detect an abnormal condition to make occur inside crankcase, as we used the diagnosis method by means of vibration. However, as a distance with the vibration soruce and the sensor gets long, it gets difficult to detect an abnormal condition.
It is necessary to advanced a research further about this unsettled probrem at issue.