Abstract
Information processing equipment such as a copy machine, which contains motors, generates vibration and noise varying as a function of time, frequency and space in a cycle. This mechanism cannot be analyzed by conventional spectrum analysis using time and space averages, because a transient state occurs. In this research, by applying short time principal component analysis, the number of independent vibration and noise sources is extracted from the signals of acceleration pickups and microphones. These results show the change of vibration and noise sources, including external noise, in a cycle. Vibration and sound pressure patterns can be expressed continuously, based on measurement or prediction by the boundary element method using vibration data on the surface of the structure in each instance. Moreover, transient external noise can be separated from vibrationally induced noise in practice.
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