354 放射音を用いたCFRP積層板の実験的衝撃荷重同定

概要

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This paper proposes a method to identify the location and force history of an impact force acting on CFRP laminated plates using the radiated sound. Sound pressure measured with microphones is used to identify the impact force. The impact location is identified using arrival times of the sound wave at the sensors. Experimental transfer matrices, which relate the impact force and the measured sound pressures, are used to identify the force history. In order to verify the validity of the proposed method, impact force identification of a CFRP laminated plate is performed experimentally, and the identification results are compared with the measured ones. In addition, the effect of the stiffness of the impactor on the accuracy of identification results is examined by conducting experiments using two impulse hammer tips, one made of rubber and the other made of hard plastic. Moreover, the effect of noise on the accuracy is also examined. The experimental results reveal that the location and force history identified using the proposed method show good agreement with the measured ones. In order to identify the force history accurately, experimental transfer matrices should be constructed with an impulse hammer tip which can excite a wide frequency range.
一般社団法人日本機械学会の論文
2011-09-05