基于单自由度共振反应的模态质量计算方法

A Computing Method Modal Mass Based on the Single Degree of Freedom of Resonance Reaction

基于单自由度在简谐荷载下的共振响应结果反算单质点质量的思想,提出一种计算多自由度结构体系模态质量的方法,并利用MIDAS有限元软件求得模型模态质量,解决若干有限元软件不能直接提取模态质量的问题.模态质量原始公式计算结果与仿真实验结果的对比分析表明,该方法计算数值误差均小于5%,计算结果可以满足计算精度要求.

Based on the ideas of the resonance response results of the single degree of freedom under harmonic load calculated by the elemental point quality the authors put forward the new way of a multi-degree of freedom structure system to calculate with the modal of the quality. On this method with the finite element software it is to obtain modal quality, to solve a number of problem that the finite element software that it can not extract directly the modal quality. Compared with the results that be calculated by the modal quality in the original formula, the numerical calculation on this method is up to the enough accuracy.