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中英文翻译--频谱分析在转子动平衡中的应用.doc

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中英文翻译--频谱分析在转子动平衡中的应用.doc

本科毕业论文(设计)相关中英文翻译资料资料题目频谱分析在转子动平衡中的应用学生姓名所在院系机电学院所学专业机电技术教育指导老师APPLICATIONOFFREQUENCYSPECTRUMANALYSISINTHEROTATORMOVINGEQUILIBRIUMABSTRACTTHEEXPERIMENTALEQUIPMENTISDEVELOPEDTOSIMULATETHEROTATORVIBRATIONTHERUNNINGSTATEOFMACHINEISSIMULATEDBYUSINGDIFFERENTRUNNINGCONDITIONSTHEVIBRATIONCAUSEDBYNONEQUILIBRIUMMASSISANALYZEDANDDISCUSSEDFORFIRSTORDERWITHFOCUSLOADTHEEFFECTIVEMETHODISFOUNDOUTBYUSINGFREQUENCYSPECTRUMANALYSISINTRODUCTIONINTHECONVENTIONALISLANDOFNUCLEARPOWERPLANT,TURBINEGENERATORSETISAVERYIMPORTANTEQUIPMENTINWHICHTHECORETHERMALENERGYISTRANSFERREDINTOELECTRICENERGYWHENTHETURBINEGENERATORSETHASRUNFORLONGTIME,THEORIGINALEQUILIBRIUMOFSYSTEMWOULDBEUPSETBECAUSEOFTHEREMNANTDEFORMEDOFTHEMETAL,ABRASIONORDAMAGINGOFTHECOMPONENTSETCASARESULT,THEVIBRATIONWILLBEINCREASEDSOITISNECESSARYTOADJUSTTHEEQUILIBRIUMATSPOTONTHEOTHERHAND,ALARGETURBINEGENERATORSETALSONEEDSTHEWORKFORADJUSTINGTHEEQUILIBRIUMINTHEPROCESSOFMANUFACTURE,DEBUGGING,INSTALLATIONANDOPERATIONTHEMOVINGEQUILIBRIUMTECHNIQUEATSPOTISANIMPORTANTMEANSTOELIMINATETHEVIOLENTVIBRATIONOFTHETURBINEGENERATORSETWECOULDHAVEADEFINITELYVIEWFORTHEVIBRATIONTYPE,VIBRATIONPOWERSOURCEANDVIBRATIONPROPERTYBYANALYZINGTHEVIBRATIONOFTHETURBINEGENERATORSETORDOINGSOMESPECIALEXPERIMENTWHENTHEVIBRATIONSIGNALISOBTAINED,THEFREQUENCYSPECTRUMCOULDBEUSEDTOANALYSISTHEVIBRATIONSIGNALINORDERTODIAGNOSEQUICKLYUSINGFREQUENCYSPECTRUMANALYSIS,THEELECTRICALSIGNALOFVIBRATIONTHATISOBTAINEDBYTHEVIBRATIONSENSORANDHASAWIDEFREQUENCYRANGEWILLBEDECOMPOSEDINTOSEVERALMAINFREQUENCYCOMPOSITIONSDIFFERENTFREQUENCYCOMPOSITIONSHAVEDIFFERENTINFLUENCEONTHETURBINEGENERATORSETTHEFREQUENCYSPECTRUMANALYSISISAVERYUSEFULMETHODTOSTUDYTHEVIBRATIONOFTURBINEGENERATORSETTHEVIBRATIONCAUSEDBYROTATORMASSNONEQUILIBRIUMWITHCONCENTRATEDLOADISDISCUSSEDANDANALYZEDINTHISPAPERANDANEFFECTIVEMETHODTOPREVENTTHEVIBRATIONISPRESENTEDBYUSINGFREQUENCYSPECTRUMANALYSIS1EXPERIMENTALEQUIPMENTTHEEXPERIMENTALSYSTEMCONSISTSOFTHEMOTOR,SHAFTCOUPLINGANDROTORETCITSSTRUCTUREISVERYSIMPLETHEROTORISDRIVENBYTHEMOTORDIRECTLYITSROTATINGSPEEDCOULDBEADJUSTEDINAWIDERANGETHESYSTEMCOULDBEOPERATEDSMOOTHLYANDRELIABLYTHERATEDCURRENTOFTHEMOTORIS25A,THEOUTPUTPOWERIS250WTHEFIELDEXCITATIONOFTHEMOTORISPROVIDEDBYTHE220VACPOWERSOURCEWHICHISCOMMUTATEDBYTHESPEEDREGULATOR,THEARMATURECURRENTOFTHEMOTORISALSOPROVIDEDBYTHESAMEPOWERSOURCEITISADJUSTEDBYTHECOMPRESSORGOVERNORTHROUGHADJUSTINGTHEOUTPUTVOLTAGEOFCOMPRESSORGOVERNOR,THEMOTORCOULDBEOFSTEPLESSSPEEDREGULATEDATTHERANGE0~10000R/MIN,THERATEOFVELOCITYINCREASINGCOULDBE800R/MINTHELENGTHOFTHEEXPERIMENTALEQUIPMENTIS1200MM,THEWIDTHIS108MM,THEMASSISABOUT45KG,THEDIAMETEROFTHESHAFTIS95MM,THELENGTHOFTHESHAFTIS500MMANDTHEMAXIMUMDEFLECTIONISLESSTHAN0005~0015MMANYPOSITIONALONGTHEAXIALDIRECTIONCOULDBESELECTEDASEXPERIMENTALABUTMENTPOINTTHEDIAMETERANDMASSOFTHEEXPERIMENTALROTATINGTABLEISΦ7619MMAND600G,RESPECTIVELYTHEARRANGEMENTOFEXPERIMENTALEQUIPMENTISSHOWNINFIG1FIG1THEARRANGEMENTOFEXPERIMENTALEQUIPMENTTHEELECTRICALVORTEXSENSORSAREUSEDTOMEASURETHERELATIVELYDISPLACEMENTORVIBRATIONFORAXISTOBEARINGPEDESTALTHEYAREINSTALLEDINTHEXANDYDIRECTIONSATTHESENSORSUPPORT,RESPECTIVELYTHEYDONOTTOUCHTHESHAFT,ANDCOULDBEUSEDTODIRECTLYMEASURETHEVIBRATIONSIGNALOFTHEROTATIONSHAFTTHEFLASHINGPHASEMEASURERISUSEDTOMEASURETHEROTATORSPEEDANDTHEPHASEOFTHESHAFT2THEFREQUENCYSPECTRUMANALYSISOFVIBRATIONSIGNALTHEREALVIBRATIONOFTURBINEGENERATORSETISTHEMOSTOFSIMPLEHARMONICPERIODICMOTIONITSWAVETYPEISALSOMADEOFMANYSIMPLEHARMONICMOTIONINORDERTOANALYSISTHEVIBRATION,WESHOULDSTUDYTHEWAVETYPE,THEFREQUENCYCOMPOSITIONOFTHEVIBRATION,ANDTHEAMPLITUDESFREQUENCYCANBEUSEDASXAXISTODESCRIBETHEVIBRATIONINTHEFREQUENCYDOMAINTHEMETHODDECOMPOSINGTHEVIBRATIONINTOITSVARIOUSFREQUENCYCOMPONENTSINFREQUENCYCOMPONENTSINTHEFREQUENCYDOMAINISCALLEDFREQUENCYSPECTRUMANALYSISTHEPURPOSEOFFREQUENCYSPECTRUMANALYSISISTODECOMPOSETHESIGNALSINTODIFFERENTCOMPOSITIONSSOTHEVIBRATIONBECOMESTHESIMPLEHARMONICMOTIONINCLUDINGDIFFERENTAMPLITUDES,FREQUENCIESANDPHASESINTHEFREQUENCYSPECTRUMOFROTATORVIBRATION,THEDIFFERENTFREQUENCYISOFTENCORRESPONDINGTOTHEDIFFERENTREASONIFWECANFINDTHEFREQUENCYCOMPOSITIONOFTHEVIBRATIONSIGNAL,THEREASONOFVIBRATIONWILLBEDISCOVEREDTHEREAREABOUT80ACCIDENTSCAUSEDBYROTATORNONEQUILIBRIUMINTHEVIBRATIONACCIDENTSOFTURBINEGENERATORSETHAPPENEDINTHESPOT,AND90ACCIDENTSCAUSEDBYROTATORMASSNONEQUILIBRIUMINTHEEXPERIMENTSDESCRIBEDINTHISPAPERWESTUDYTHEVIBRATIONCAUSEDBYROTATORMASSNONEQUILIBRIUMBYUSINGTHEMETHODOFFREQUENCYSPECTRUMANALYSISANDTHEINFLUENCECOEFFICIENTMETHODOFFINDINGEQUILIBRIUMTODETERMINETHEPOSITIONOFROTATORMASSNONEQUILIBRIUM3EXPERIMENTALRESULTSANDANALYSISTHEBODEDIAGRAMSHOWNASFIG2ISABOUTTHEHORIZONTALVIBRATIONCHARACTERISTICSOFROTATORITSHOWSTHATTHECRITICALVELOCITYOFROTATORISABOUT2605R/MIN,THEMAXIMUMAMPLITUDEOFROTATORCORRESPONDINGTOTHEBEARINGSHELLIS371ΜM,THEAMPLITUDEOFSELECTFREQUENCYAMP1XIS360ΜM,ANDTHEPHASEDIFFERENCEPHA1XIS36THEMARKPOSITIONINFIG3ISTHEMAXIMUMVALUEOFVIBRATION,ANDALSOISTHEPOSITIONWHERETHEPHASEANGLECHANGESWHENTHEROTATORSPEEDISSMALLERTHAN2152R/MIN,THERELATIVEPHASEANGLEIS130WHENTHEROTATORSPEEDINCREASESTO2605R/MIN,THE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