复杂动力学系统计算模型的修改

The Parametric Identification of Complex Dynamic Structural Models Using Modal Transformation

本文介绍使用输入或输出残量法的数学模型的修改.应用模态转换来减小被修改模型的自由度数,模态转换矩阵由数学模型的低阶模态组成,高阶模态的静力修改被考虑.对于不同的系统,引进相关模态坐标系和不相关的模态坐标系,前者适合于弱模态耦合系统,后者适合于高密度模态系统.在两个模态坐标系中的参数识别过程完全类似于在物理坐标系中的识别过程.

This paper presents the updating of the mathematical model of a large system using the input or output residual method. Modal transformation is applied to the parameter identification method published by the second author. In modal transformation only the modes associated with the lower eigenfrequencies of the mathematical model are used and the static corrections of the higher modes taken into accout. The correlated modal coordinate system and the uncorrelated modal coordinate system are introduced for different systems. The former is appropriate to weak modal coupling systems,and the latter is for systems with high modal density. The discussed identification procedures in the two modal coordinate system are similar to the method in the physical coordinate system.