2224 圧電素子を用いた構造物の衝撃検出に関する研究 : 第二報,圧電センサ出力信号の時間長が検出精度に及ぼす影響(スマート構造システム同定・振動制御・診断)

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In this study, the effect of time duration of the measured sensor signal to the impact identification capability of time reversal processing method is experimentally demonstrated. Time reversal processing for the measured sensor signal can be applied to detect not only structural damage but also impact loading of the structure. After measuring the electrical sensor signals corresponding to scattered wave filed of the plate experimentally, time reversal processing is applied to the measured signals in the numerical wave back propagation simulation for localizing the impact loading point on the plate. A time-reversed wave travels back through the plate and is focused on the region around a point where hits by the impact hammer. The illustrative experimental and numerical processes demonstrated the impact identification capability of time reversal processing method. Even if the measured signals were missing the wave front induced by the impact, the signal to noise ratio of the backward process was successfully improved by using the long time duration of the measured sensor signals.
2007-08-08