アイソグリッド構造に作用する衝撃の位置・荷重履歴同定

抄録

This paper presents an experimental study on the identification of impact forces acting on an isogrid-stiffened panel which consists of a thin skin and ribs arranged in a repetitive equilateral triangular pattern. The locations and the force histories of the impacts applied to the panel are identified using the responses of surface bonded piezoceramic disks by employing an identification method based on experimental transfer matrices. The experimental transfer matrix is adopted to relate the force history of the impact to the time history of the response of the PZT sensor, and it is constructed utilizing the measured data obtained by conducting preliminarily impact tests. When the panel is subjected to unknown impacts, the impact locations and force histories are identified so that the sensor responses calculated with the experimental transfer matrices match the measured responses of the PZT sensors. To verify the validity of the present method, the identification of impact forces acting on an isogrid-stiffened aluminum panel is performed experimentally. Here, the identification is demonstrated for a single point impact and also for impacts acting at two locations. The results reveal that the identified impact locations and the force histories agree well with the measured ones.