步兵战车车体结构有限元模型修正

针对某型步兵战车整车刚柔耦合发射动力学中柔性车体有限元模型精度低的问题，基于模态试验数据，应用支持向量机响应面模型修正理论对车体结构有限元模型进行了修正。应用ANSYS有限元分析软件对车体结构进行模态分析，提取前6阶模态的固有频率和振型。为验证模型，设计了模态试验方案，实测了车体结构的模态信息。基于有限元模型数据与实测数据的相对误差，采用支持向量机响应面模型修正方法对车体结构弹性模量和密度进行修正。模型确认结果和动力学模型应用结果表明，修正后的车体有限元模型精度有了大幅度提高，能更加真实地反映车体的结构特征，为射击精度分析提供了准确的模型基础。

Finite-Element Model Updating for Infantry Combat Vehicle Car-Body

Based on modal experiments, the car-body finite element model is updated applying the support vector machine response surface method (SVM-RSM) model updating theory, which is used to increase the low precision of the flexible car-body finite element model in a rigid-flexible coupling dynamic simulation model. The first six frequencies and modes of the car-body are extracted using modal analysis through ANSYS software. The modal experiment program is designed, and the modal information of the car-body is tested to validate the finite element model based on the errors of both FE model data and tested data. The elastic modulus and density of the car-body are updated using the SVM-RSM model updating method. Model validation and the application of the dynamic model show that the precision of the updated finite element model has advanced so much that it can accurately reflect the structure characteristics of the car body and provide the exact model for a foundation for firing accuracy analysis.