基于测试频响函数的结构连接参数识别方法

构造了半刚性结构连接单元，并应用于结构连接参数识别的模型中。利用子结构法建立的组合结构有限元模型和不完备的组合结构的测试频响函数，导出了连接子结构参数识别方法。提出了基于子矩阵因子法求解变量系数矩阵的通用方法。并将参数识别归结为求解非线性最小二乘问题，应用信赖域法克服了最小二乘求解初值选取范围过小的问题。最后利用仿真算例对上述方法进行了验证，结果表明该方法可行且具有一定的实用性。

Identification of Joint Parameters of Structures Using Measured Frequency Response Functions

The finite element model of the semi-rigid connection between members of frame structures is established in this paper, and it is applied to the model of joint parameters identification. A method for identifying joint properties of structures is presented by combining the experimentally obtained incomplete frequency response functions (FRFs) with the substructure mathematical model, which is normally a finite element idealization excluding undetermined joint properties. A general method for separating variable coefficient matrix is proposed using the submatrix approach. In the process, the trust -region algorithm is employed to solve the nonlinear least square problem. The accuracy and feasibility of the proposed method is demonstrated by an example. The result indicates that the proposed method is robust in the identification of the joint physical parameters.