機械故障診斷學-06振動診斷

1、Section Section 機械振動Guiding Cross Guiding Cross y yy yyxy1 Ay1 A1y3 A1sin(1t)A2 sin(2t)A3 Ny aiyyy(t) A2 21按振動的原因31 21按振動的原因31 度度系統(tǒng)振動141按振動O移特直線振動P51線性振動P非線性振規(guī)律和產(chǎn)生原因kMnr RnmM=240kg,kMnr RnmM=240kg,轉(zhuǎn)速 Rf 2RRSection Section 機械振動一1振動參數(shù)的 dm A一1振動參數(shù)的 dm Avmm當頻率很P時 A2 (2f)2ad/(2fmmmm2P頻測振動O1傳感器選1傳感器選P頻測動O

2、移O移傳感應式1電容式1電感式1壓電Vibration Absolute displacement (high frequency,Vibration Absolute displacement (high frequency,small displacement)-VibrationAbsolute displacement (high frequency, small VibrationAbsolute displacement (high frequency, small ThisThisisthemostfrequentlyusedvibrationWidefrequencyHigh振

3、動O移傳感振動O移傳感PrimarycoilAPrimarycoilA&Bconnectedcoil選擇傳感器時要考慮的技術(shù)選擇傳感器時要考慮的技術(shù)11測量范 對于O注意線性范圍 O同的傳感器有O同的頻寬，選擇傳感器時要考慮的選擇傳感器時要考慮的技術(shù)31測量精41外界影響的51可 O1測O1測點O置的選傳感傳感器四1測量系四1測量系統(tǒng)AnleofysisandAnleofysisand五1信調(diào)理1.Signal五1信調(diào)理1.Signal2fmax (信最高頻率工程實際fs (5-fmax1.2.多個O換分信的3.非周期信采樣周期Ts對采樣信的影采采樣周期Ts對采樣信的影采t00t采00ttTT

4、utorialYou arerequiredtomeasurevibration acceleration of a unbalanced motor,TutorialYou arerequiredtomeasurevibration acceleration of a unbalanced motor,Themotorisingat3000rpm,butthehas36slotsinitsrotor,highervibrationmayeansalingrateofanADCyoudSpecifythetoThebasicvibrationfrequencyisTheslotvibratio

5、nmaybeashighas TheADCtobechosenshouldideallyhaveslingrateof1800*10=18kResolution分辨率The resolution of the converter indicates the numberofdiscretevaluesResolution分辨率The resolution of the converter indicates the numberofdiscretevaluesitcanproduceoverthe rangeofvoltagevalues.Itisusuallyexpressedin Forl

6、e,antencodesogueinputoneof256discretevalues(0.255)hasaresolutioneightbitsVoltage resolution of an ADC is equal to its overall voltagemeasurementrangedividedbythenumber of discrete values.SomelesmayTutorialThereisasinewavesignaltoTutorialThereisasinewavesignaltobeThelingrateof10timesofsignalfrequency

7、(meanseachcyclewetake10litudeofthesignalis5IftheADCresolutionis2bits,whatisthedigitalIftheresolutionis4bits,whatisthedigitalsignal Iftheresolutionis8bits,whatisthedigitalsignal Comparethesedigital六1信顯示P處So,abasichasa六1信顯示P處So,abasichasascreentOneYgainTimebaseXshiftandYDirectlydisplaysignalincontinuo

8、usegratesignaloNoneedofprogrammingEasytoVirtualUsingaPC,an erfacecanbedesignedVirtualUsingaPC,an erfacecanbedesignedlikeThisiscalledVirtualvirtualinstrument,youDisplaydifferentsignals indifferentAs many control knobs and buttons as you like Controltheinstrumentusingthemouseandkeyboard Set up alarm or automatic shut downegratewith control,network, ThemostfamousVirtualrVirtualVirtualVirtualVirtualinstrumentdevelopedbyDrJohnMeasurement:Singular1001Measurement:Singular10012345Measurement:none00123Measurement:none0012345Measurement:Howmany100123Measureme