结构局部修改后模态参数的重分析  

RE-ANALYSIS OF MODAL PARAMETERS OF A LOCAL MODIFIED STRUCTURE

作　　者：张希农[1] 罗允同[1] 

机构地区：[1]西安交通大学工程力学系

出　　处：《西安交通大学学报》1989年第6期27-34,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金

摘　　要：本文考虑在结构修改时,振动系统的物理参数(质量、阻尼、刚度)同时变化时,将它们的改变量以向量积的形式表示,利用修改前的振动特性,计算出修改后的振动系统的频率响应函数,进而拟合出修改后系统的模态参数。该方法对物理参数改变量的大小可以任意,理论上计算结果是精确的,且计算过程简单,计算工作量小。In this paper, the authors take account of the simultaneous changes of the physical parameters (mass, damping and stiffness) of a vibration system, when its structure is modified. Representing this change quantity in the form of vector product and using the vibrating propertiesb efore modification, he frequency response function of modified vibration system can be calculated, and then its modal parameters can be computed by curve fitting. In this method, the change quantity of the physical parameters can be any value and the theoretical results are accurate. Furthermore, calculating process is simpler and easier.

关 键 词：结构 设备 模态参数 动力学 

分 类 号：TB122[理学—工程力学]