摘要
提出了移位迭代模态法，可以大大提高特征向量对设计参数导数的计算效率。从理论上证明，经典模态法、修改模态法和迭代模态法只是移位迭代模态法的特殊情况。文中还给出以ＦＯＲＫ和３Ｄ－ＦＲＡＭＥ两种结构为实例的计算机仿真，并与已有的几种模态法进行了比较。理论分析与计算机仿真表明，本方法计算特征向量导数时，只需用很少几个模态即能保证精度，从而可以在保证精度的条件下大大提高计算速度。
A shifted-iterative modal method is developed in this paper to increase efficiency in the computation ofeigenvector derivative with respect to design parameters. It is proved theoretically that the classical modalmethod, modified modal method and iterative modal method are the special cases of the new proposedmethod. Computer simulations with two structures,named FORK and 3D-FRAME,has been conducted andcompared with the results obtained by using other modal methods. Theoretical development and computersimulations show that only few modes are the required and,therefore the efficency can be greatly increasedwith the same accuracy in eigenvector derivative calculation by shifted-iterative modal method.
出处
《振动工程学报》
EI
CSCD
1995年第3期247-252,共6页
Journal of Vibration Engineering
基金
国家自然科学基金
关键词
结构动力学
特征向量
移位迭代模态法
structural dynamics
structural modification
eigenvector
shifted-interative modal method
