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《基于小波脊線的多分量信號(hào)瞬時(shí)參數(shù)估計(jì)及應(yīng)用-論文.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、第50卷第10期機(jī)械工程學(xué)報(bào)V_01.50N0.1O2014年5月JOU『RNALOFMECHANICALENGINEERINGMay2O14DoI:1O.3901/JME.2014.10.001基于小波脊線的多分量信號(hào)瞬時(shí)參數(shù)估計(jì)及應(yīng)用水張焱湯寶平鄧?yán)?重慶大學(xué)機(jī)械傳動(dòng)國(guó)家重點(diǎn)實(shí)驗(yàn)室重慶400030)摘要:通過(guò)分析小波脊線與信號(hào)瞬時(shí)幅值和瞬時(shí)頻率的關(guān)系,提出一種基于能量重心脊點(diǎn)定位策略的脊線跟蹤提取算法實(shí)現(xiàn)多分量信號(hào)瞬時(shí)參數(shù)估計(jì)。針對(duì)小波脊線提取中定中心頻率參數(shù)優(yōu)化方法優(yōu)化復(fù)Morlet小波參數(shù)存在的局限性問(wèn)題,提出中心頻率自適應(yīng)參數(shù)優(yōu)化方法優(yōu)化
2、復(fù)Morlet小波參數(shù)并計(jì)算歸一化小波尺度譜,根據(jù)能量重心脊點(diǎn)定位策略定位小波脊點(diǎn),配合局部方向估計(jì)算法實(shí)現(xiàn)小波脊線迭代跟蹤提取,進(jìn)而估計(jì)信號(hào)瞬時(shí)參數(shù)。仿真分析表明該算法具有良好的抗噪特性,齒輪箱和滾動(dòng)軸承的故障診斷工程實(shí)例結(jié)果表明該方法可有效提取旋轉(zhuǎn)機(jī)械故障振動(dòng)信號(hào)的特征。關(guān)鍵詞:參數(shù)優(yōu)化;脊點(diǎn)定位;脊線跟蹤;瞬時(shí)參數(shù)中圖分類號(hào):THl15Instantane0usParameterEstimationofMulti—componentSignalsUsingWaveletRidgesandItsApplicationZHANGYanTANGBa
3、opingDENGLei(TheStateKeyLaboratoryofMechanicalTransmission,ChongqingUniversity,Chongqing400030)Abstract.Afteranalyzingtherelationshipbetweenthewareletridgeandtheinstantaneousamplitudeandfrequencyofthesignal,anewridgetrackingalgorithmwhichbasedonenergycentrobaricridgepointdefec
4、tionmethodisproposedtoestimatetheinstantaneousparametersofmulti—componentsigna1.AnewparameteroptimizationmethodwhichchangesthecentrefrequencyofcomplexMorletwaveletadaptivelyisbroughtforwardtoovercomethelimitationsthatexistintheparameteroptimizationmethodwithfixedcenterfrequenc
5、y,thenthefactorsofcomplexMorletwaveletareoptimizedthroughthenewparameteroptimizationmethodandnormalizedwaveletscalogramisobtained.Cembiningwithlocaldirectioncomputationalgorithm,energycentrobaricridgepointdetectionmethodisemployedtotrackridgesandcomputeinstantaneousparameterso
6、fsigna1.Simulationresultsshowthatthealgorithmisinsensibletonoise,theresultoffaultdiagnosisingearboxandrollingbearingshowthatthefeaturesoffaultvibrationsignalsofrotatingmachinerycanbeextractedefectivelybyusingtheproposedmethod.Keywords:parameteroptimization;ridgepointdetection;
7、ridgetracking;instantaneousparameter量信號(hào)不能完全分離J;③小波脊線,該方法通過(guò)0前言小波變換獲得時(shí)間尺度譜,再利用時(shí)間尺度譜上提取得到的小波脊線估計(jì)信號(hào)分量瞬時(shí)幅值和瞬時(shí)頻當(dāng)旋轉(zhuǎn)機(jī)械元件出現(xiàn)局部故障時(shí),故障振動(dòng)信率’。J。相比于前兩種方法,基于小波脊線的瞬時(shí)號(hào)常表現(xiàn)為多分量的調(diào)幅調(diào)頻信號(hào),該類信號(hào)具有參數(shù)估計(jì)具有更高的估計(jì)精度,而且具有更好的抗的時(shí)變特征與系統(tǒng)物理結(jié)構(gòu)及其狀態(tài)緊密相關(guān),準(zhǔn)噪性能。確獲取信號(hào)分量瞬時(shí)特征具有重要意義J。瞬時(shí)幅為精確獲取信號(hào)瞬時(shí)參數(shù),需要從構(gòu)建合適的值、瞬時(shí)頻率常用于描述信號(hào)瞬時(shí)特征
8、J,常用的分析小波及小波脊線提取兩方面入手。為了獲得時(shí)信號(hào)瞬時(shí)幅值和瞬時(shí)頻率估計(jì)方法有以下幾種:①頻聚集性良好的時(shí)間尺度譜