時間領域データによる構造系のパラメータ同定 : 第1報, 改良した状態変数解析法による構造系のモード特性同定

抄録

The paper presents a method to identify the global modal parameters of a mechanical structure from the free decay responses, which is based on the State Variable Method expressed in the form of difference state equation. A recursive algorithm is proposed for calculation of the state transition matrix. The modal shapes of a large number of stations for each mode are obtained by making use of the data acquisition system with a few channels, which is resulted from the uniformity of the normalized modal shapes. The generalized mathematical model of the method is related to the other time domain methods. As the illustrative examples, the method is applied to the identifications of global modal parameters of a free-free straight pipe and a "T" shape plate structure. And, the identified results are in good agreement with the analytical ones.