有限元动力模型优化的一种方法

A Method of Finite Element Dynamic Moded Optimization

本文研究以振动试验测得的飞机结构的固有频率为目标值的有限元动力模型的优化问题。应用了一种迭代优化法,该方法基于动力平衡方程以及正交性。通过修改刚度矩阵的元素来优化,使计算出的固有频率与试验测得的频率值基本一致,并成功地应用于无人机水平尾翼模型上,效果良好。

In this paper, a study on finite element dynamic model optimization is conducted on the basis of taking the inherent frequency of the aircraft structure measured from the vi-bration experiments as the larger. A new optimization method by iteration is applied, on the basis of dynamic equilibrium equations and orthogonality. The stiffness matrix ele-ments are modified for optimization in order to compute inherent frequency in accord with the measured frequencies from the test.The method is successfully applied to the real models of the horizontal tail wing of a pilotless aircraft.