基于分级思想的高温环境结构动力学模型修正

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (19) : 145-150.

论文

基于分级思想的高温环境结构动力学模型修正

何成1,2，何欢1，陈国平1

作者信息 +

Research on Finite Element Model Updating in the High-Temperature Environment Based on the Global Approximate Function

He Cheng, He Huan, Chen Guoping

Author information +

文章历史 +

摘要

论文研究基于全局近似函数的高温环境结构动力学模型的修正问题。首先，对影响高温环境下的结构动力学模型的动特性因素进行分析，确定了在高温环境下结构表面温度分布和结构动响应之间近似满足独立关系，并在此基础上提出了一种分级修正思想，给出了分级修正基本流程。然后，以热参数为修正参数，构造了温度分布残差关于修正参数的全局近似函数，将模型修正问题转化为优化问题，对结构温度分布进行第一级模型修正。随后，在温度分布修正结果的基础上，考虑结构间隙对边界条件的影响，以边界接触刚度为修正参数，以高温环境下的结构固有频率为修正目标，对结构动力学模型进行第二级修正。最后，以高温环境下的机翼模型为研究对象，通过算例分析验证了本文提出的分级修正方法的有效性。

Abstract

In this paper，a method have been proposed to investigate the problem of finite element model updating in the high-temperature environment using the global approximate function. In this method the temperature field of the structures has been updating as the first stage, which is taken into the structures dynamic model as initial conditions. Then it has finished the whole updating process, an application example-a wing finite element model is implemented with this method. The results from this new method are compared with those obtained from the traditional model updating methods, which show that model using the classification method can significantly improve the model updating efficiency and precision.

导出引用

何成;何欢;陈国平 . 基于分级思想的高温环境结构动力学模型修正[J]. 振动与冲击, 2012, 31(19): 145-150

He Cheng;He Huan;Chen Guoping . Research on Finite Element Model Updating in the High-Temperature Environment Based on the Global Approximate Function[J]. Journal of Vibration and Shock, 2012, 31(19): 145-150