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基于静力响应的有限元模型修正技术广泛应用于工程结构的参数识别中,需要解决软件实现、基准数据与目标函数选取,以及参数的灵敏度分析等问题。利用位移响应信息对损伤位置确定的悬臂梁进行了损伤程度的精确识别,对于损伤位置不能确定的情况,通过引入应变约束条件实现了损伤位置与损伤程度的同时确定。作为实际工程算例,将飞机静强度试验得到的位移响应与内力响应作为基准数据,利用模型修正技术确定飞机方向舵有限元模型边界条件。算例比较了不同目标函数和约束条件对修正效果的影响,并通过增加内力响应信息进一步修正了根部约束参数,为计算分析提供了精确有限元模型。
Finite element model correction technology based on static response is widely used in the parameter identification of engineering structures. It is necessary to solve the problems of software implementation, selection of reference data and objective function, and sensitivity analysis of parameters. Using the displacement response information, the damage degree of the cantilever beam with the damaged position is accurately identified. For the situation where the damage position can not be determined, the damage position and damage degree can be determined by introducing the strain constraint condition. As a practical engineering example, the displacement response and internal force response obtained from the aircraft static strength test are taken as the reference data, and the model modification technique is used to determine the boundary conditions of the aircraft rudder finite element model. The example compares the effect of different objective functions and constraints on the correction effect and further corrects the root constraint parameters by adding the internal force response information to provide an accurate finite element model for the calculation and analysis.