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1、148差分振子時(shí)間歷程在微弱調(diào)制信號(hào)檢測(cè)中的應(yīng)用2013年12月文章編號(hào):1006·1355(2013)06-0148—05差分振子時(shí)間歷程在微弱調(diào)制信號(hào)檢測(cè)中的應(yīng)用馬朝永一,王克,胥永剛,段建民(1.北京工業(yè)大學(xué)機(jī)電學(xué)院,北京100124;2.北京工業(yè)大學(xué)電控學(xué)院,北京100124)摘要:?jiǎn)我坏牟罘终褡觾H可實(shí)現(xiàn)對(duì)周期信號(hào)中某一頻率成分進(jìn)行檢測(cè),對(duì)于強(qiáng)噪聲背景下的邊頻帶,盡管可以利用多個(gè)差分振子組成差分陣列進(jìn)行逐個(gè)檢測(cè),進(jìn)而確定邊頻帶的間隔,但這種做法無(wú)疑會(huì)帶來(lái)巨大的計(jì)算量。在對(duì)調(diào)制信號(hào)進(jìn)行Hilbert變換包絡(luò)分析時(shí),所得到的時(shí)域信號(hào)是原始調(diào)制信號(hào)中的低頻分量,
2、亦是調(diào)制波信號(hào),若該低頻分量仍然包含較強(qiáng)的噪聲成分,傳統(tǒng)的頻譜分析將會(huì)失效。此時(shí),我們可借助差分振子時(shí)間歷程對(duì)含較強(qiáng)的噪聲的包絡(luò)進(jìn)行檢測(cè)。因此,提出基于差分振子時(shí)間歷程的微弱調(diào)制信號(hào)檢測(cè)方法,即首先對(duì)信號(hào)進(jìn)行Hilbert包絡(luò)解調(diào),然后利用差分振子時(shí)間歷程對(duì)含較強(qiáng)的噪聲的幅值包絡(luò)進(jìn)行檢測(cè),并成功應(yīng)用于風(fēng)機(jī)早期故障檢測(cè)中。關(guān)鍵詞:振動(dòng)與波;差分振子;時(shí)間歷程;Hilbert變換;故障診斷中圖分類號(hào):TH133.3;TH165文獻(xiàn)標(biāo)識(shí)碼:ADOI編碼:10.3969/j.issn.1006—1335.2013.06.032WeakModulationSignalDet
3、ectionBasedonDiferenceOscillatorTimeCourseMAChao-yong1,27WANGKe27XUYong-gang,DUANJian-min。(1.CollegeofMechanicalEngineeringandAppliedElectronicsTechnology,BeijingUniversityofTechnology,Beijing100124,China;2.CollegeofElectronicInformationandControlEngineering,BeijingUniversityofTechnol
4、ogy,Beijing100124,China)Abstract:Singlediferenceoscillatorcarlonlydetectthecomponentwithacertainfrequencyinperiodicsignas.Inordertodeterminetheintervalofthesidefrequency—bandofthesignalinstrongnoisebackground,itisfeasibletousethemultiplediferenceoscillatorarraystodetectthefrequencieso
5、nebyone.Butthismethodiscomputer-timeconsumingandcostly~Hilberttransformbasedonmodulationsignalenvelopeanalysiscanbeusedtoobtainthelowfrequencycomponentoftheoriginalmodulationsigna1.But,ifthelowfrequencycomponentcontainsstrongnoise,thetraditionalspectrumanalysisinthismethodwillfail.Tos
6、olvetheproblem,thetimecourseofdiferenceoscillatorCallbeusedtotestthegainedenvelopesignalwhichcontainsthestrongnoise.Inthispaper,anewweakmodulationsignaldetectionmethodbasedontimecourseofdiferenceoscillatorwasproposed.Firstofall,Hilberttransformwasusedintheenvelopedemodulationtogainthe
7、envelopecomponentofthesigna1.Then,envelopedemodulationtestonthegainedcomponent,whichcontainsthestrongnoise,wasdoneusingthemethodofdiferenceoscillatortimecourse.Themethodwassuccessfullyappliedintheearlyfanfaultdetection.w:vibrationandwave;diferentialoscillator;timecourse;HilbertWansfon
8、n;fau