摘要
基于有限元技术,运用大型有限元软件MSC.NASTRAN,进行了三维建模设计。采用模态和瞬态响应分析法对喷管的动力特性进行了分析计算,得到了喷管在工作过程之中的的动态响应与动力特性(固有频率及振型),并与风洞激振频率实验进行了对比验证。结果表明:该喷管模态频率分布良好,动态特性较好,避开了主要激振频率,使喷管能有效避免产生共振。
Based on the finite element technology, using the finite element software MSC. NASTRAN, the three- dimensional model of a large wind tunnel nozzle is established and the dynamic characteristics were explored. The modal analysis and transient responses were analyzed to obtain the dynamic response and dynamic characteristics （natural frequency and vibration modal） , and then the analysis results are compared and verified by wind tunnel vibration frequency experiments. The results show that the nozzle modal frequency distribution and dynamic charac- teristics are better, avoiding the main wind tunnel vibration frequency.
出处
《机械科学与技术》
CSCD
北大核心
2014年第4期469-473,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51275422)
"十一五"国家批准建设的大型航空基础设施项目资助
关键词
风洞
喷管
三维建模
动态响应
动力特性
computer software
dynamic characteristic
dynamic response
experiments
finite element method
mathematical models
modal analysis
natural frequencies
nozzles
three-dimensional model
transi- ent analysis
wind tunnel
