225 転がり軸受の損傷による異音発生箇所の可視化に関する実験的研究

概要

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A method to locate the sound source of an abnormal noise of machinery is developed experimentally. Sound source localization is realized by means of a near-field acoustic holography (NAH). A faulty journal bearing is used to generate the actual abnormal noise. A two-dimensional distribution of complex sound pressure on a dominant frequency component is required to use the NAH, so the frequency is decided from the spectrum of the abnormal sound. Furthermore, the sound pressure distribution is acquired by a real-time measurement system, which has 64 microphones. It is decided experimentally that a timing to acquire the sound pressure distribution should be at the end of the impulsive waveform, on which the output from the phase sensitive detector is stable. It is shown that the sound source localization of the abnormal noise from the faulty bearing is realized with an optimal frequency and timing.
2002-04-18