放射音を用いたCFRP積層板の実験的衝撃荷重同定

抄録

In this paper, a method for identifying an impact force acting on a CFRP laminated plate is proposed. The location and force history of the impact force are identified using the sound radiation from the impacted plate. Microphones are used to measure the sound pressures at multiple locations. The impact location is identified from the arrival times of the sound wave to the microphones. For the force history identification, experimental transfer matrices which relate the impact force and the measured sound pressures are used. The force history is identified by minimizing the deviation between the measured and estimated sound pressures where the estimated ones are obtained using the experimental transfer matrices. The validity of the proposed method is verified experimentally by performing impact force identification of CFRP laminated plates. In addition, the effect of background noise on the accuracy of the identification results is also examined. The results reveal that the proposed method is capable of accurately identifying the impact location and force history from the radiated sound.