高校博士点基金资助项目(20040248013)
正交模型-正交模态法(CMCM)是一种参数修改的新方法,它具有不依赖于灵敏度分析、不需要进行迭代的特点.但是在有限元存在整体建模误差时,该方法会出现无法完成修正计算的情况,本文针对此问题进行了改进.改进后的方法可以既可以处理存在局部建模误差的情况,也可以处理存在整体建模误差的情况.本文通过梁式结构的数值算例,比较了原修正方法(CMCM)、改进后的修正方法(ICMCM)以及商业软件模型修正FEMtools的修正效果.结果表明:改进的正交模型-正交模态方法可以使分析频率更好地逼近实验值,物理参数的修改也更加准
Cross Model - Cross Mode (CMCM) is a new method of updating parameters, which doesn’t depend on the result of sensitivity analysis and needs no iterative. But this method can’t finish the updating when the Finite Element Method (FEM) has a global error. Aiming at this problem, this paper proposed an Improved CMCM method (ICMCM) based on CMCM. The numerical test of a beam was used to compare the correction of CMCM, ICMCM and commercial software FEMtools. Result indicates that ICMCM can update parameters best both in local error and global error condition.
李剑,洪嘉振,李伟明.模型修正的正交模型-正交模态改进法[J].动力学与控制学报,2008,6(1):61~65; Li Jian, Hong Jiazhen, Li Weiming. An improved cmcm method for model updating[J]. Journal of Dynamics and Control,2008,6(1):61-65.
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