摘要
本文建立了粘弹阻尼结构频响函数计算的高精度模态展开法。文中表明，用模态展开法计算粘弹阻尼结构的频响函数，只取少数低阶振动模态时，计算误差较大。本文用低阶振动模态和系统矩阵，表达高阶振动模态和蠕变模态对粘弹阻尼结构频响函数的贡献，修正计算误差。该方法可以显著提高计算精度，对计算量的增加不大。文中给出算例，表明了本文提出方法的正确性和有效性。
An accurate modal superposition method for calculating frequency response function of viscoelastically damped structures is put forward. As shown in this paper, the errors of calculation are considerable, while only a few of low-frequency vibrating modes are used in modal superposition for calculating frequency response function of viscoelastically damped structures. The contribution of high- frequency vibrating modes and creeping modes to frequency response function of viscoelastically damped structures is expressed by the low- frequency vibrating modes and the system matrixes, and the errors of calculation are corrected. In this method, the calculation precision can be improved greatly with limited increase of computational effort. A numerical example is given, which demonstrates the correctness and efficiency of the present method.
出处
《工程力学》
EI
CSCD
北大核心
2000年第5期74-78,120,共6页
Engineering Mechanics
基金
福建省自然科学基金!(E9810012)
关键词
频响函数
模态展开法
粘弹阻尼结构
viscoelasticity
frequency response function
modal superposition method
