Estimation of Virtual Exciting Source by Free Vibration Response and Application of Structural Design for Noise Reduction

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  • 自由振動応答計測に基づく仮想加振源の推定と騒音低減化構造設計への応用

Abstract

<p>Exciting force on structures is required for estimation of vibration and noise after structural modification. Conventionally, the vibration response after the modification is obtained by measuring or estimating the excitation force before the modification and assuming that the force is invariant after the modification. However, in general, the force changes before and after the structural modification. Virtual exciting source (VES) has been proposed to change the force on structure. VES consists of connecting vibration system and structural invariant force. In this paper, practical method of the identification of the position of VES, the characteristics of the system and the structural invariant force is proposed. First, for a target structure with known modal parameters, the ratio of measured forced vibration response at multiple response points and the calculated forced vibration response at assumed excitation point is calculated. The true excitation point is obtained as the point which make the variance of the ratio minimize. Second, characteristics of connecting vibration system are optimized as minimized error between natural frequency measured by free vibration response and calculated natural frequency. Finally, structural invariant force is calculated from the measured acceleration and the characteristics of the structure. For cantilever rectangular plate, the validity of this method is shown in numerical simulations and experiments.</p>

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