摘要
采用动力优化的分析方法,以提高第一阶固有频率为目标,避开金属波纹管系统前四阶固有频率共振为约束,以波高、壁厚及卡箍位置为设计变量,对某型飞机航空管路中波纹管进行了动力优化。结合动力优化结果,采用蒙特卡洛法分析了影响波纹管固有频率的参数灵敏度,结果表明波纹管材料的弹性模量和密度、波纹管系统的波高和管壁厚度是影响波纹管固有频率的主要因素。根据可靠性分析中的干涉理论,分析了前四阶频率的分布情况,对金属波纹管的共振可靠性进行了研究。研究结果为波纹管系统的动力安全可靠性设计提供参考。
A dynamical optimization analysis of a metal bellows for aviation pipelines is carried out with the finite element method（FEM）.To avoid the first four order resonance frequencies,the bellows is optimized by maximizing the first order natural frequency as optimization object and taking the wall-thickness,convolution height of the bellows and the position of sustainment as design variables.Based on the results from dynamical optimization analysis,the Monte-Carlo method is introduced to analysis the parameter sensitivity to the natural frequency of bellows system.It is shown that the Young＇s modulus,the density of the material property and wallthickness,convolution height of bellows are major factors to low order natural frequency.Finally,the distributing of the first four order natural frequencies is analysed and the interference theory is used to process the bellows system＇s anti-resonance reliability analysis.The results can do help in anti-resonance design and the reliability estimation of bellows system.
出处
《航空制造技术》
2010年第21期81-85,共5页
Aeronautical Manufacturing Technology
基金
国家高技术研究发展专项(863计划)(2007AA04Z404)
高等学校学科创新引智计划(111工程)(B07050)
西北工业大学科技创新基金资助项目(2008KJ02019)
关键词
波纹管
优化
蒙特卡洛法
参数灵敏度
共振可靠性
Bellows Optimization Monte-Carlo method Parameter sensitivity Resonance reliability
