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.
出处
《振动与冲击》
EI
CSCD
北大核心
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
关键词
模态试验
身管
有限元模型修正
支持向量机响应面
modal test
gun barrel
finite element model updating
support vector machine response surface method（SVM-RSM）
作者简介
苏忠亭男，博士生，1984年生
通讯作者徐达男，教授，博士生导师，1969年生
