行波管模态分析与有限元模型修正  

Modal Analysis and Finite Element Model Updating of Traveling Wave Tube

作　　者：邱华荣 宋芳芳[2] 莫海军[1] 吕东亚[3] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]工业和信息化部电子第五研究所电子元器件可靠性物理及应用技术重点实验室,广东广州510610 [3]北京真空电子技术研究所,北京100016

出　　处：《机械设计与制造》2017年第4期96-99,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(51505089)

摘　　要：行波管的工作环境恶劣,其结构的振动特性对寿命及可靠性有着重要影响。应用有限元分析软件对行波管进行模态分析,并通过模态试验实测了行波管的模态参数,得到行波管前四阶固有频率和振型。对比分析仿真和试验结果,仿真计算的模态频率偏高。应用Kriging模型构建固有频率与材料参数的关系,将试验结果作为目标进行材料参数修正。修正后的仿真模型的计算精度有了大幅度提高,行波管结构的固有振动特性得到更加真实地反映,为进一步研究其动力学特性提供了更加准确的模型基础。As a result ofTWT＇s poor working conditions, vibration characteristics of the structure hare great influences on the life and reliability. Finite element software was used to do modal analysis and the modal information of the TWT was measured by modal test. The first four order modal frequencies and modal shapes were obtained. Colnpared and analyzed of the result of simulation and test, the modal frequency of simulation was higher. Kriging model was applied to build the surrogate models far natural frequency and material parameters, test results would be set as the target in updating .The precision of the updated finite element model of TWT is raised so much that natural vibration characteristics of TWT get more real to reflect, and a more accurate model for further research on dynamic characteristics of TWT is provided.

关 键 词：行波管 模态分析 模态试验 模型修正 KRIGING模型 

分 类 号：TH16[机械工程—机械制造及自动化] TN124[电子电信—物理电子学]