界面自由度柔性等效与子结构频响函数综合方法

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (17) : 200-205.

论文

张勇，侯之超，赵永玲

作者信息 +

Frequency response functions based sub-structuring synthesis method considering a flexible equivalent transformation on the interface

ZHANG Yong，HOU Zhichao，ZHAO Yongling

Author information +

文章历史 +

摘要

针对频响函数子结构综合法中由于转角自由度频响函数缺失造成的综合建模误差较大的问题，提出了界面自由度柔性等效方法。将界面分为若干子界面，假定子界面刚性，通过最小二乘坐标变换，提取可描述子界面特征的6自由度分量，据此实现对子界面的刚性等效，综合所有子界面的等效自由度即形成界面的柔性等效。利用等效后的界面柔性自由度与原界面自由度的关系，对子结构的原始频响函数进行相应地变换，并将其应用到子结构频响函数综合方法中。仿真结果表明，将界面自由度进行柔性等效能明显提高频响函数的综合精度。

Abstract

Frequency response function based substructuring (FBS) synthesis method play a significant role in the analysis of complex systems. However it fails to produce acceptable results due to the absence of rotational degrees of freedom. An equivalent transformation on the interface is proposed in this paper. Interface is divided into several sub-interfaces. Assuming sub-interfaces are rigid, and then 6 degrees of freedom (DOFs) resulting from least squares transformation are sufficient to describe all motions of a rigid sub-interface. Taking all of the DOFs form different sub-interfaces into account approximately describe all rigid as well as flexible motions of an interface. That is called a flexible equivalent transformation on the original interface. Likewise the original frequency response functions are transformed and apply it to FBS subsequently. Simulation results show that the flexible equivalent transformation on the interface can significantly improve the coupling results.

导出引用

张勇，侯之超，赵永玲. 界面自由度柔性等效与子结构频响函数综合方法[J]. 振动与冲击, 2017, 36(17): 200-205

ZHANG Yong，HOU Zhichao，ZHAO Yongling. Frequency response functions based sub-structuring synthesis method considering a flexible equivalent transformation on the interface[J]. Journal of Vibration and Shock, 2017, 36(17): 200-205

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