Development of an optimized new generation condition monitoring system for reciprocal fishing vessel engine based on ultrasonic vibration analysis.

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The purpose of this research is development of an optimized new generation condition monitoring system for reciprocal fishing vessel engine which is not generally well kept at cost and man power associated with maintenance. In, particular, the construction on the estimation method of lubricated and critical torque rich conditions within fishing vessel engine is carried out by measuring generated ultrasonic vibration signal in operation. As merit of the proposed condition monitoring system, is able to monitor the symptom of the initial fault of fishing vessel engine, lubricated and critical torque rich conditions are closely related with the initial faults and performance of the reciprocal engine. Further, the monitoring system is able to monitor from the middle fault forth by analyzing obtained audio frequency band vibration and sound generated from the reciprocal engine too. The identification method of fault conditions is based on paralleled ARX model (Auto Regressive with Extra Input) at condition monitoring locations within the engine. It is possible to diagnose above fault condition by the improve SN ratio.