基于多尺度局部保持投影的轴承故障特征增强方法  

Bearing Fault Feature Enhancement Method Based on Multi-scale Locality Preserving Projection

作　　者：张晓涛[1] 唐力伟[1] 王平[1] 邓士杰[1] 

机构地区：[1]军械工程学院火炮工程系,石家庄050003

出　　处：《噪声与振动控制》2014年第6期166-168,173,共4页Noise and Vibration Control

基　　金：国家自然科学基金(507752169);军队科研资助项目([2011]107)

摘　　要：针对轴承故障声发射信号的非线性特性,及易受背景噪声干扰的特点,提出一种多尺度局部保持投影方法。通过小波包分解实现一维信号的多尺度构造,利用近邻图保持信号局部流形信息,通过局部保持投影将信号变换到新的坐标空间下,实现故障特征增强。仿真和实验信号处理结果表明,多尺度局部保持投影方法在轴承故障增强检测中效果显著。Aiming at the nonlinearity and the disturbance of noise-background for acoustic emission of bearing fault, themethod of multi-scale locality preserving projection is presented. The original signal is transformed into one-dimensional signalwith multi-scale structure through wavelet packet decomposition, and the local manifold information of the signal is maintainedby the neighborhood graph. Then, the multi-scale signal structure is converted to a new coordinate space by locality preservingprojection, and the fault information can be enhanced. The results of simulation and testing data show that the multi- scalelocality preserving projection has an obvious enhancement effect in bearing fault detection.

关 键 词：振动与波 局部保持投影 多尺度 特征增强 故障诊断 

分 类 号：TH133.1[机械工程—机械制造及自动化]