弹性连杆机构动力学模型的一种修正方法

提出了一种利用实则固有频率数据修正弹性连杆机构有限元动力学模型的方法，该方法的基本原理是利用机构固有频率实测值和有限元计算的加权误差建立目标函数，然后用优化方法使目标函数极小化，从而识别出机构局部构件结构参数的修正值，另给出了一平面四杆机构有限元动力学模型修正算例说明方法的有效性。

A Method for Updating Dynamic Finite Element Models of Elastic Linkages

A method for updating the dynamic finite element model of a elastic linkage using measured eigenfrequencies is proposed. The proposed updating technique directly modi- fies the selected local physical parameters of the initial finite element model . The modified lo- cal physical parameters are estimated by minimization of the weighted differences of measured and calculated eigenfrequencies with a minimum change of the modified parameters . Numeri - cal optimization methods along with dynamic parameter sensitivities are used for solving the parameter estimation problem . Practical applicability of the method has been assessed by its application to the updating of the finite element model of a planar four-bar elastic linkage.