202 表面インテンシティ計測を応用した押し当て式機器異常音検出センサ

概要

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Surface acoustic intensity is a useful measure for the identification of structure-borne sound that is radiated from a specific surface of a machine or a device in operation. In this technique, the intensity is determined by the sound pressure and the normal velocity on the vibration surface, which are directly measured by a microphone and a vibration pickup, respectively. In order to facilitate multiple point measurements, an efficient technique for setting two different sensors is required. In this paper, a hand-held sensor probe is proposed and the application is described. The sensor probe is composed of a 1/2-inch condenser microphone and an accelerometer of 1g. The two components are connected with a damper made of silicon rubber that isolates the transmission of the vibration. The precision of measurements is confirmed by the experiments in noisy environment. The sensor probe is applied to the detection of sound radiated from a hard disc drive unit working as a PC peripheral device in an office setting.
社団法人日本機械学会の論文
2003-06-04