支架结构建模中设计参数的修正与优化

Updating and Optimization of Design Parameters in Frame Structure Modeling

为降低某支架有限元建模的参数设置误差。根据有限元模态和实验模态结果,建立模态频率残差向量。应用灵敏度分析法,从结构12个设计参数中选取了3个弹性模量和3个密度参数作为修正量。以模态频率残差向量和参数修正量构建目标函数,并采用优化算法行求解。修正后的有限元模态与实验模态具有高度的一致性,表明修正后的支架有限元模型能够准确地反映结构特性,同时也验证设计参数修正方法的有效性和可行性。

In order to reduce the setting error of parameters in finite element modeling of a frame, the modal frequencyresidual-error vector has been established based on the results of the finite element modal analysis and experimental modalanalysis. Three elastic moduli and three density parameters are selected among 12 design parameters by using sensitivityanalysis method. The objective function is constructed with the modal frequency residual- error vector and the parameterscorrection values. And an optimization method is introduced to solve the updating process. It is found that the modal resultof the updated model is nearly identical to the experiment modal result, which shows that the updated finite element modelcan reflect the structure characteristics correctly. Meanwhile, the validity and feasibility of the design parameters updatingmethod is also verified.