Study on Detection of Abnormal Noise Source under Runniug Condition of Small Sized Diesel Engine

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If abnormalities of the marine engine are recognized in the early stage, the engine trouble and accident can be avoided. This paper describes the method of searching the position where the abnormality occurred on the engine by using the generating sound.<BR>A small-sized diesel engine was used as a test engine, and the experiment was made by generating the sounds which were regarded as an abnormal sound near the test engine under operation. The abnormal sound which had a sine-wave characteristic was generated with a loud speaker.<BR>The frequency of the abnormal sound was detected by using Maharanobis' generalized distance, and the abnormal position was searched by means of the frequency data. As a result, it was possible to search exactly the abnormal position by using the above method.
社団法人日本マリンエンジニアリング学会の論文