Accurate modal superposition method for calculating frequency response function of viscoelastically damped structures

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[1] Tong, Xin
来源：
Tong, Xin | 2000年 / Tsinghua Univ, Beijing, China卷 / 17期
关键词：
Damping - Frequency response - Modal analysis - Vibrations (mechanical) - Viscoelasticity;
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摘要：
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.
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