基于模态试验的某火炮身管有限元模型修正  

Finite-element model updating for a gun barrel based on modal test

作　　者：苏忠亭[1] 徐达[1] 杨明华[1] 薛静[1] 

机构地区：[1]装甲兵工程学院兵器工程系,北京100072

出　　处：《振动与冲击》2012年第24期54-59,共6页Journal of Vibration and Shock

基　　金：军内科研计划项目

摘　　要：针对某火炮刚柔耦合发射动力学中柔性身管有限元模型精度低的问题,提出一种基于支持向量机响应面模型修正理论和模态试验的身管组件有限元模型修正方法。应用ANSYS有限元分析软件对某火炮身管与支架装配体进行模态分析,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,实测了火炮身管与支架装配体的模态信息。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身管与支架装配体弹性模量和密度进行修正。MAC模型确认结果和动力学模型应用结果表明:修正后的身管组件有限元模型精度有了大幅度提高,能更加真实地反映身管组件的结构特征,为射击精度分析提供了更加准确的模型基础。A barrel assembly finite element model updating method based on SVM-RSM model updating theory and modal test was proposed to solve a problem of low precision of a flexible barrel finite element model in rigid-flexble coupling dynamic simulation. The first six modal frequencies and modal shapes of a barrel and bracket assembly were obtained with modal analysis using ANSYS software, a modal test was designed to validate the finite element model and the modal information of the barrel and bracket assembly and was implemented. Young＇s modulus and the density of the barrel and bracket assembly were updated utilizing SVM-RSM model updating method. MAC model validation and the dynamic model application showed that the precision of the updated finite element model is raised so much that the structural character of the barrel assembly can be reflected more truely and the more accurate model is provided for firing accuracy analysis.

关 键 词：模态试验 身管 有限元模型修正 支持向量机响应面 

分 类 号：TJ301[兵器科学与技术—火炮、自动武器与弹药工程]