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本文首先在工程的意义上阐述了结构动特性灵敏度与结构各阶模态的势能与动能的关系,分析了灵敏度与结构转角自由度的关系.然后提出了一种增加结构转角自由度的有效方法。并在此基础上,对一个自由——自由梁,在增加转角自由度振型以后,进行了灵敏度分析、结构修改与模态频率配制的研究,分析结果验证了所提方法的可行性与实用性.从本文的研究中可以看到对结构进行灵敏度分析的实质.
In this paper, firstly, the relation between the sensitivity of structural dynamic characteristics and the potential energy and kinetic energy of each mode of structure is expatiated in the engineering sense, and the relationship between the sensitivity and the degree of structural freedom of rotation is analyzed. Then an effective method to increase the degree of structural freedom . On the basis of this, a sensitivity analysis, structure modification and modal frequency configuration research on a free-free beam after increasing the vibrational mode of corner degree of freedom are carried out. The analysis results verify the feasibility and practicability of the proposed method From the study in this paper, we can see the essence of the sensitivity analysis of the structure.