英文翻译2Word文件下载.docx

英文翻译2Word文件下载.docx

《英文翻译2Word文件下载.docx》由会员分享，可在线阅读，更多相关《英文翻译2Word文件下载.docx（11页珍藏版）》请在冰豆网上搜索。

（1）Vibrationfrequency;

（2）Harmonicvibration,forexample,twooctave,3octavevibration;

（3）Theentirebasebandfrequencyscores（suchas1/2,1/3,etc.）ofthevibration;

（4）Frequencyandbasebandintotherelationshipbetweenacertainpercentages（eg38%~49%）ofthevibration;

（5）ultra-low-frequency（vibrationfrequency5Hzbelow）vibration;

（6）Ultra-highfrequency（vibrationfrequencyin10kHzandabove）Vibration

2.Amplitudedirectionaccordingtoclassification

（1）Diameter（horizontal）tothevibrationthatisthedirectionalongtheshaftdiameterofthevibrationisgenerallydividedintohorizontalvibrationstraightvibration.

（2）Axialvibration,thatis,thedirectionalongtheaxisofvibrationcutting;

（3）Tensionalvibration,thatis,thevibrationalongtheshaftrotationdirection.

3.byvibrationofthereasonsforclassification

（1）Thevibrationcausedbyrotorimbalance;

（2）Shaftmisalignmentcausedbyvibration;

（3）Slidingbearingandcrankshaftvibrationcausedbyeccentricity;

（4）Themachinepartscausedbyloosevibration;

（5）Friction（suchassealfriction,therotorandthestatorfriction,etc.）causedbyvibration;

（6）Bearingdamagecausedbyvibration;

（7）Slidingbearingoilwhirlsandoilwhipcausedbyvibration;

（8）Airpowerandhydraulicvibrationcausedbyfactorssuchas;

（9）Bearingstiffnessasymmetrycausedbyvibration;

（10）Electricalaspectsofthereasonsforthevibrationcausedby

4.Vibrationoccurredbythesiteclassification

（1）Rotororshaft（includingthejournal,shaftprofilevane,etc.）vibration;

（2）Bearings（includingthefilmslidingbearingsandrollingbearing）vibration;

（3）Shell,bearingvibration;

（4）Infrastructure（includingaircraftseats,table,orbracket,etc.）vibration;

（5）Otherareassuchasvalves,pipestem,andavarietyofstructuralvibration,etc.

Inaddition,ifaccordingtothecharacteristicsandformsofvibration,butalsoseparationofsynchronousvibrations（forcedvibration）andsub-synchronous（self-excitedvibration）,etc...Duetovibrationscausedbythefailureofitsmanifestationsarediverse,inordertoaccuratelyidentifiedthecausefailurescause-generallyspeaking,havetorelyonsignalprocessingtechniquesandvibrationtheory,andothermodernmethodsandmeanstoconductacomprehensiveandintegratedanalysisandinaccordancewiththegradualaccumulationofexperienceinthespecificcircumstances,theonlywaytoachievefaultdiagnosissuccess.Failureofrotatingmachineryandthereforemustbecharacterizedbyresearch.

2.2Thecharacteristicsofrotatingmachineryfault

Theimplementationoffaultinthedynamicmonitoringofrotatingmachinery,wemustpayattentiontootherfeatures:

2.2.1RotorFeatures

Therotorcomponentisthecoreofrotatingmachineryandequipment,whichisfixedbytheshaftandtheinstallationofvarioustypesofcirculardiscoidcomponents（suchascoupling,bearings,impeller,gear,balancedisk,pulley,wheel,flywheel,etc.）,formed.Astheentirerotorinhigh-speedrotationmovements,soitsmanufacture,installation,commissioning,maintenanceandmanagementhaveaveryhighdemand.Ifyouhadproblemswithoneofthesecomponents,orinconnectionwithachangeinpartanexceptionoccurred,theyimmediatelydrewastrongvibrationunit.Itcanbesaidofdynamicmonitoringrotatingmachinerymonitoringanddiagnosisismainlytherotorstateofmotion.

2.2.2Thefrequencycharacteristicsofrotatingmachineryvibration

Mostofrotatingmachineryvibrationsignalsisperiodicsignals,quasi-periodicsignal,orastationaryrandomsignal.Failureofrotatingmachineryvibrationcharacteristicshaveacommonpoint,namely,thefailureoftheircharacteristicfrequencyrelatedwiththerotorspeedisequaltotherotorrotationfrequency（referredtoastransferfrequency,alsoknownasfrequency）anditsoctaveorsub-frequency.Therefore,theanalysisofvibrationsignalsofthefrequencyandturntherelationshipbetweenthefrequenciesofrotatingmachineryfaultdiagnosisofakey.

2.2.3forrotatingmachineryvibrationmonitoringthemainway

Vibrationsignalanalysisisthebasicmethodformonitoringrotatingmachinery,themainthree-prongedapproachtoobtainmonitoringinformation

1.Analysisofrotatingmachineryvibrationfrequencyofeachtypeoffaulthasitsowncharacteristicfrequencyatthescenetomakethefrequencyofthevibrationsignalanalysisisthediagnosisofrotatingmachineryofthemosteffectivemethod.Frequencyspeedofrotatingmachineryislikea"

militarydemarcationline,"

theentirebandisdividedintosub-andsuper-asynchronousasynchronousvibrationfrequencyofvibrationoftwosections,toseizethispoint,helpsustoanalyzeandjudgethefault

2.Analysisofamplitudeanddirectionoffeaturesinsomecases（certainlynotalloccasions）differenttypesofrotatingmachineryfaultvibrationontheperformancecharacteristicsofacleardirection.Therefore,thevibrationofrotatingmachinerymeasurements,aslongasconditionspermit,thegeneralmeasureofeachmeasuringpointshouldbehorizontal,verticalandaxialthreedirections,asindifferentdirectionstoprovideuswithadifferentfaultinformation.Leakagemeasuredinonedirection,youmayloseamessage.

3.Analysisoftherelationshipbetweentheamplitudechangeswiththespeedofaconsiderableportionofrotatingmachineryfaultvibrationamplitudeandspeedchangesarecloselyrelated,soon-sitemeasurements,whennecessary,tocreateconditionsforasmuchaspossible,intheprocessofchangingthespeedamplitudemeasurementofthemachinevalue.

2.3RotatingMachineryVibrationFaultDiagnosis

Asmentionedearlier,equipmentfaultdiagnosisisessentiallyapatternclassificationarebasedontestanalysisobtainedonthestateinformation,andgroupedintoacertaintypeofequipmentfailure.Therefore,thecharacteristicsofeachtypeoffaultmusthavesufficientunderstanding.Equipmentdiagnosticsdevelopmenttoday,thepeoplethroughalargenumberofexperimentalstudiesandawiderangeofdiagnosticpractice,foravarietyofdevices（especiallyrotatingmachinery）ofthefailuremechanism,faulttypeanditscharacteristicshaveaconsiderableunderstandingofunderstanding.Statisticsshowthat,withtheproductionofadifferentnature,thetypeofequipmentusedisalsodifferent,sotheproportionofvarioustypesoffailuresisalsoinconsistent.Hereareseveralcommonfaultdiagnosisofrotatingmachineryvibrationcharacteristics,diagnosticmethodsandexamples.

2.3.1Imbalance

Accordingtotheinformationthatvarioustypesofrotatingmachineryfailureduetoimbalanceofabout30%,wecanseethatthemachinerotorimbalancecausedbyrotatingmachineryvibrationisacommonmultiplefaults.Tofullyunderstandandgraspthecharacteristicsandmechanismofunbalancedfaultdiagnosisisveryimportant.

1.Thecausesofimbalancescausedbyrotorimbalancearemanyreasons,suchas:

①unreasonablebecauseitisdesignedgeometrycausedbydifferentheart,ordeviatefromthegeometriccenterlineofrotaryvalveshaft;

②Manufacture,installationerror;

③Rotormaterialuneven,orheatunevenly;

④Rotorinitialbending;

⑤Workmediuminthesolidimpuritiesintherotorontheunevendeposition;

⑥Rotorinthecourseofcorrosion,wearandtear;

⑦Rotorpartsloose,falloff.

2.Rotorimbalancemayleadtoconsequencesfortheflexiblerotormayalsogenerateadditionaldegreeofdamageduetodynamicinertiaofthecentrifugalforcecausedbyimbalance.Forvariousreasonscausedbyrotorunbalancefaultisabasicallythesamepattern.Tosumup,therotorimbalancemayleadtothefollowingundesirableconsequences:

（1）Therotorcausedbyrepeatedbendingandinternalstress,causingtherotorfatigue,evenleadtorotorfault;

（2）Toenablethemachineinoperationduringtheexcessivevibrationandnoise,sothatitwillacceleratethewearofbearingsandothercomponentstoreducelifeexpectancyandefficiencyofthemachine;

（3）Throughthevibrationoftherotorbearings,machinetransmitstothebaseblocksandbuildings,resultingindeteriorationinworkingconditions.

3.Rotorimbalancegenerallyincludethefollowingfourcases

（1）Staticunbalance;

（2）double-sidedimbalances;

（3）Staticanddynamicimbalance;

（4）Dynamicimbalance.forexample:

2-1:

Amongthem,staticimbalanceisanimbalanceinthecrosssection,whiletheremainingthreekindsofimbalanceisanimbalanceonthenumberofsections,andeachinspiredbyacross-sectionduetoimbalancesinthelateralvibrationandstaticunbalanceisthesameasthemechanismof.Inotherwords