一种基于结构相似性的动特性预示方法

提出了一种基于结构相似性的全弹动特性预示方法。首先通过基于遗传算法的模型修正方法,获得了参考型号精度较高的有限元模型,进而得出了结构刚度参数的修正系数,然后根据结构相似性,将参考型号结构刚度参数的修正系数应用于相似型号结构动特性建模及仿真。试验验证结果表明,采用本方法预示的导弹全弹动特性与试验结果相比,前三阶频率最大偏差不超过11%,各阶振型与试验结果相近。

A method of dynamic property prediction based on structural similarity

A method of dynamic property prediction based on structural similarity was proposed by this paper. First, the precise FEM model of the reference missile was achieved by model updating based on GA,then the correction coefficients were solved. According to structural similarity, the dynamical model of the new similar missile was setup using the correction coefficients of the reference missile, The test results have verified that, the deviation of the first three natural frequencies of the new model is less than 11%, and the first three mode shapes are in agreement with test.