摘要
本文研究了具有复阻尼多自由度结构系统的识别问题。提出了一种基于复模态分析的识别方法，该方法通过构造各阶模态参数的灵敏度矩阵来形成海赛矩阵，将识别问题归结成一新变量（参数）集下的无约束优化问题。本方法具有物理力学意义明确，算法简捷，能自动实现模型定阶，收敛快，识别精度高且数据工作量小等特点。为了说明本方法的效果，一大型复杂结构的识别实例及比较结果在文中给出。本研究分线性和非线性两部分；非线性识别问题将在另一篇文中讨论。
In this paper, a time-domain identification method based on the complex modal analysis technique is presented for the multi-degree -of-freedom structural systems with visco and hysterestic dampings, in which the identifying problem is converted into an unconstraint optimization procedure with a set of new variables (systematical parameters) by means of a tranformation that the Hessian matrix is created with the sensitivity matrix of the structural system. The approach has the advantages of concise algorithm, rapid convergence rate, high estimate accuracy, and realization of auto-selection of model order, etc. A numerical example is presented to illustrate the effectiyeness of this method. The present paper is the first of two companion papers. The nonlinear identification of the same problem is given in the second paper.
出处
《工程力学》
EI
CSCD
1994年第1期99-109,共11页
Engineering Mechanics
基金
云南省应用基础研究基金
关键词
模态分析
振动
结构动力学
identification, modal analysis, vibration
