振动环境中螺纹联结松动过程的研究  

Unintentional unscrewing of screw joints under vibration condition

作　　者：赵登峰[1] 曾国英[1] 

机构地区：[1]西南科技大学制造科学与技术学院,四川绵阳621000

出　　处：《振动与冲击》2010年第10期175-178,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金-中国工程物理研究院联合资助基金项目(10876034)

摘　　要：采用数值仿真和实验相结合的方法,研究振动环境中螺纹联接松动过程的动力学响应特性,寻求能提前预警螺纹联接失效的特征量。首先定性地分析了螺纹联接松动的变化过程,建立了高度简化的螺纹联接动力学模型;通过数值仿真和实验相结合的方法验证了定性分析和简化模型的正确性;最后通过对大量实验数据的分析,筛选出谐波失真度作为螺纹联接失效的预警指标。实验分析表明谐波失真度不论是简谐激励还是随机激励都能较好地识别螺纹联接的临近松动状态。By using numerical simulations and tests,the dynamic response characteristics of unintentional unscrewing of screw joints under vibration condition were studied.Features values of early-warning joints failure were found out.Firstly,qualitative analysis of the unintentional unscrewing process was performed.Subsequently,a simplified dynamic model of the screw joint was built and verified.Finally,through analysis of experimental data,the THD was put forward as a better early-warning indicator.The results show that the THD is a better early-warning indicator with either sinusoidal excitation or frequency bandlimited random excitation.

关 键 词：螺纹联接 状态识别 谐波失真度 

分 类 号：TH131.3[机械工程—机械制造及自动化]