面ブレにともなう小型軸流ファンの音質変化(機械要素,潤滑,工作,生産管理など)

概要

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This paper describes a sound quality change caused by a failure aerodynamic sound in a micro axial fan in order to apply an acoustic diagnosis at cooling fan motor assembly line. The failure aerodynamic sound is focused to a rotational fan blade tone and blade passing noise with fan blade run-out change. In this experimental result, a correlation between the sound quality metrics (Sharpness, Roughness, Fluctuation strength, Tone-to-noise ratio) and the blade run-out is cleared. In addition, an acoustic diagnosis technique for a fan blade run-out is proposed using an adaptive spectrum enhancer. This proposed acoustic diagnosis technique is used to adaptive feedback algorithm using internal model control architecture to extract a periodic abnormal signal including aerodynamic noise generated by rotating a micro axial fan. As the experimental results, the blade passing sound signal with the blade run-out change was improved about 10dB by using this adaptive feedback algorithm.
社団法人日本機械学会の論文
2009-04-25