Abstract
A study is made on a relatively simple system which can find the abnormal conditions of a diesel engine in a short time utilizing the sounds emitted from the engine. The 4-cycle diesel engine, whose rated power is 1100kW, is used in this experimental study. The experiments are carried on a voyage.A statistical method can be used for detecting abnormalities. The basic sound pattern of normal operation in the engine is formed. Sample sound is compared with this basic sound pattern, and judge whether the engine turn abnormal condition.In this system, authors cosider a series of process of the sounds sampling, data processing, judging whether the sounds are normal, as a sequential operation and examine algorithm which can quickly perform these processings by a personalcomputer. In conclusion, this paper shows the results of this system continuously performing a series of processing from sounds sampling to judgment on whether they are normal. The diagnose takes time of 28 seconds for a 4 stroke cycle, and its results can also be commented favorably.
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