舶用ディ-ゼル機関の診断技術に関する研究-2-排気弁吹き抜け異常診断

概要

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Authors have discussed some kinds of analyses of acoustic sounds due to changing load on an uniflow marine diesel engine in the first report. That methods have been proved to offer some effective informations and basic data to a diagnostic system for marine diesel engines.<BR>This paper describes that the following useful diagnostic technique provides some comparative results of acoustic sounds of a 4-stroke diesel engine on using the normal exhaust valve and the faulty one. The faulty exhaust valve has a slit on the edge of its surface which contacts the exhaust port of the cylinder cover.<BR>A new method is able to extract a distinctive part of signals or a finite interval ones from the internal combustion cycle on acoustic sounds. It is proposed to be easily able to recognize of some difference between normal and abnormal conditions of a diesel engine. This method is named MEPS (Method of Extracting Part of acoustic Sounds) .<BR>It is presented that an obvious difference between the two conditions occures during periods of the valve overlap in the internal combustion cycle as a result of analyses of acoustic sounds by MEPS.
公益社団法人日本マリンエンジニアリング学会の論文