基于emd与谱峭度的滚动轴承故障检测改进包络谱分析.doc

------------------------------------------------------------------------------------------------ ——————————————————————————————————————基于 EMD 与谱峭度的滚动轴承故障检测改进包络谱分析振动与冲击第30卷第2期 VIBRATION ANDSHOCK 基于EMD与谱峭度的滚动轴承故障检测改进包络谱分析蔡艳平,李艾华,石林锁,白向峰,沈金伟(第二炮兵工程学院五系,西安710025) 摘 calMode 要: 针对滚动轴承故障振动信号的调制特征和传统包络分析法的缺陷,提出一种基于经验模式分解(Empiri. position , 简称EMD ) 和谱峭度( Spe ctrumKurtosis , 简称sK ) 的改进包络谱滚动轴承故障诊断方法。该方法 Mode 首先对滚动轴承故障振动信号进行经验模式分解. 将其分解为多个固有模式Eij数( IntrinsicFunction , 简称 IMF)之------------------------------------------------------------------------------------------------ ——————————————————————————————————————和, 然后对各IMF分量傅里叶变换后取其绝对值, 并计算其谱绝对值平方包络, 在此基础上再计算不同频带IMF分母谱平方包络的峭度, 最后利用谱峭度的滤波器作用, 选取由轴承缺陷所引起的共振频率所在频带的IMF分量,自动构建最佳包络来进行故障诊断。将该方法应用到滚动轴承内圈缺陷的仿真故障数据和实际数据中,分析结果表明J,该方法的有效性。关键词: 经验模式分解; 谱峭度; 包络谱; 滚动轴承; 故障诊断中图分类号:;TH806 文献标识码:A Rollerbearingfaultdetection usingimprovedenvelopespectrum analysisbased on EMD andspectrumkurtosis CAlYah-ping , LIAi — hua , SHILin — SUO,BAIXiang-feng,SHENJin-wei (DepartmentNo .5, theSecondArt illeryEngineeringCollege . Xi ’ al l710025,China) Abstract: According ------------------------------------------------------------------------------------------------ —————————————————————————————————————— tomodulationcharacteristics ofroller bearing faultvibration signals and limitationof on traditionalenvelopeanalysis , arollerbearingfaultdiagnosism ethodusingimprovedenvelopeana lysisbased empirical position ( EMD ) andspe ctrumkurtosis ( SK ) wasproposedhe re . Firstly , rollerbearingfaultv ibrationsignals were posedintoIMFinto aa finitenumberofintrinsicmode ------------------------------------------------------------------------------------------------ —————————————————————————————————————— funotions(IMFs ) .Secondly,FFr transfo ? rmationwasusedtomake each spectralsignalandcalculatet heirabsolutevalues , thenspectru mkurtosisvalueswerecalculated using eachIMFspectralabsolutevalu esquareenvelope . Finally , usingt hefilteringfun