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For analysing gear noise, power spectrum has mostly been employed hitherto. It is well known, however, that characteristic sound for human auditory sense, caused by a projected material on the surface of a tooth of gear or cyclic hum produced from gear box under running, for example, can not be expressed objectively by such a method only.<BR>Authors suggest that much more informations might be obtainable by observing the variation of spectrum components with the time passing by, and introduce in this paper some experimental analyses expressed by spectrographic display, so-called "sound-spectrograph or voice print", and a comparison with ordinary spectrum analyses. Examples presented here are noise of running gear in normal condition, noise of running gear when a tooth was injured by putting some material, cyclic hum of reduction gear, and noise of running epicyclic gear.<BR>As a conclusion it can be said that the results by this analysing method, having been developed mainly for recognition of voice, revealed that lot of informations could be obtained about running conditions of gears, and that it was possible to open up a new field in detecting any abnormality of gears.
公益社団法人日本マリンエンジニアリング学会の論文