基于HHT的法兰螺栓连接松动实验研究  

Experimental Research on the Bolt Joints Looseness Based on HHT

作　　者：张永娟[1] 曾国英[1] 赵登峰[1] 权玉[1] 

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《机床与液压》2014年第1期4-6,70,共4页Machine Tool & Hydraulics

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

摘　　要：通过对随机激励下法兰螺栓连接结构的响应信号进行HHT分析,得到了各固有模态函数(IMF)的能量分布规律和不同预紧力下响应信号的时频谱。结果表明:IMF能量分布百分比在不同预紧力下有较强的规律,能较好地反映螺栓连接结构的松动情况;HHT三维时频谱图直观地反映了能量分布随着预紧力的变化情况,说明选用具有自适应性的HHT对振动环境下法兰螺栓连接结构进行分析较合适。The Hilbert-Huang transform （HHT） was proposed to analyze the response signal of flange bolt joints structure under random excitation. The energy distribution law of every intrinsic mode function （IMF）,the marginal spectrum and time-frequency spectrum of response signal under different preforce were obtained. It is shown that the percentage of IMF energy distribution has strong rule under different preforce,which can well reflect the loose condition of bolt joints structure;the HHT three dimensional time-fre-quency spectrum can intuitively show the situation of energy distribution with preload changes,and using adaptive HHT to analyze flange bolt joints structure under vibration environment is more suitable.

关 键 词：随机激励 螺栓连接 希尔伯特黄变换 能量分布 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]