Operational Deflection Shape Analysis of Multiple Exciting Sources with Random Noise.

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  • ランダムノイズを含む複数加振系の実稼動時挙動解析
  • ランダム ノイズ オ フクム フクスウ カシンケイ ノ ジツカドウジ キョドウ

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Abstract

This paper investigates operational deflection shape analysis using multi-channel time history response. One of the problems in the case of multi-channel data acquisition is noise from the sensors. Operating vibration characteristics are obtained using principal component analysis or the response-ratio method. Principal component analysis is a technique to determine unknown force input and operational deflection shape. The response-ratio method is a technique to determine operational deflection shape from the ratio of power spectra. This paper describes noise reduction in operational deflection shape using principal component analysis and the response-ratio method. Noise reduction is verified by the correlation function on frequency domain. The ratio of noise reduction is improved more using principal component analysis rather than the response-ratio method. The correlation on frequency domain is able to accurately determine the operational deflection shape.

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