实验模态综合法若干问题的研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (9) : 174-177.

论文

实验模态综合法若干问题的研究

宋攀; 董兴建; 孟光

作者信息 +

Reserch on several problems of experimental modal synthesis method

Song Pan; Dong Xing-jian; Meng Guang

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文章历史 +

摘要

提出了子结构可补偿高阶截断模态且易与实验模态相结合的剩余动柔度概念，然后采用自由界面模态综合技术，实现子结构综合。通过部分忽略高阶截断模态的动态效应给出了剩余质量和剩余刚度的近似表达式，简化了子结构的实验建模；基于谐波集中力系的等效原理，提出了一种全新的转角动柔度间接测量方法，在一定程度上解决了实验模态综合中的界面对接信息不足问题。克服了将实验模型和有限元分析模型进行模态综合中的技术难题，数值计算和实验验证表明所提方案可行。

Abstract

The residual dynamic flexibility, a new definition of the inertia relief attachment mode is proposed. The free-interface component mode synthesis method based on the residual dynamic flexibility can compensate for high-order truncate modes and it’s easy for experimental measurements. The approximated representations of residual mass and residual stiffness are deduced by partly ignoring the dynamic effects of the truncated modes. This method is used to set up the dynamic model of the full structure by coupling experimental model of component A and finite element model of component B. The problem of spatial incompleteness is solved by estimating the rotation mode shapes using a numerical differentiation method. Finally, numerical examples have demonstrated the validity and efficiency of proposed method.

导出引用

宋攀;董兴建;孟光. 实验模态综合法若干问题的研究[J]. 振动与冲击, 2011, 30(9): 174-177

Song Pan;Dong Xing-jian;Meng Guang. Reserch on several problems of experimental modal synthesis method[J]. Journal of Vibration and Shock, 2011, 30(9): 174-177