用附加质量和刚度修改结构固有频率与局部振型

对在结构局部自由度上附加质量与刚度，从而使结构某阶固有频率与局部振型分量满足给定设计要求的动力修改问题提出了一种求解方法。本文方法仅需利用结构局部自由度上的动柔度参数，计算过程简便。给出了一悬臂梁的固有频率与局部振型修改算例来说明方法的有效性。

Modification of Modal Frequencies and Shapesby Using Additional Mass and Stiffness Technique

This paper offers a solution to the problem of dynamic modifications in a structure, which is to change the modal frequency and shape of a certain order of the structure to meet the requirements prescribed by adding mass and stiffness to local degrees of freedom of the structure. The computational procedure of the solution is quite simple and convenient because only the dynamic flexibility data on local degrees of freedom of the structure are required in the computation. A numerical example of the modification of a cantilever beam is given to show the effectiveness of the solution.