Experiment report of the Comprehensive ExperimentWord格式文档下载.docx
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Experiment report of the Comprehensive ExperimentWord格式文档下载.docx
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Directory
1.SystemConception
1.1ExperimentBackground
1.2MeasurementSystemDesign
Whatisproblem?
Howtosolve?
Whatsensorcouldbeused?
Whattypeofdisplayisthemostsuitable?
Howtoconditionsignalsandlinkwithdevices?
Whatisthebestsolution?
2.DataAcquisition
2.1Speedandfrequencymeasurement
2.2Measurementoftestingbasevibration
2.2.1Timedomainanalysis
2.2.2Frequencydomainanalysis
2.3Axisorbitmeasurement
2.4Measurementofnoiseoftest-bed
3.PostPerfection
3.1MeasurementSystemImprovement
3.2WorkingSystemImprovement
4.ContactwithReality
4.1WheelDynamicBalance
4.2NoiseDetection
1.1ExperimentBackground
①Whatisdynamicbalance?
Dynamicbalanceisthebranchofmechanicsthatisconcernedwiththeeffectsofforcesonthemotionofabodyorsystemofbodies,especiallyofforcesthatdonotoriginatewithinthesystemitself,whichisalsocalledkinetics.
Animbalanceoftherotorintheprocessoftherotationofthesupportingstructureandtherotoritselfproducesastress,leadingtovibration.
②Whyweneeddynamicbalance?
•Improvethequalityofrotor
•Reducenoise
•Reducevibration
•Toimprovetheservicelifeofbearingcomponents
•Reducethediscomfortofusers
•Reducethepowerconsumptionoftheproducts
③Whatkindofmachinesdoingthisexperiment?
Dynamicbalancingmachineistheinstrumentwhichusedtomeasuretherotorimbalanceandcorrect,accordingtothemeasurementtoimprovethebalanceoftherotorweightdistribution.Sothevibrationoftherotorshaftneckorreducetheforceactingonthebearingduringoperationtothespecifiedrange.
④Whataretheengineeringbackgroundoftheexperiment?
Figure1
Thisexperimentwidelyappliedinengineering.For
example,itisoneoftheimportanttestingitemsintheworkingbalanceofauto-wheels.Thewheelofcarismadeupoftireandthewheelhub.Butbecauseofthemanufacturingreasonsandetc.Soitisimpossiblefortheoverallqualityofthepartsofdistributionisveryuniform.Andwhenthecarwheelinhigh-speedspin,itwillindynamicimbalancesituation,leadingtowheelswobble,andthesteeringwheelvibration.Itisverydangerousandwemustavoidit.Inordertoavoidoreliminatethisphenomenon,wewillincreasetheweightunderthedynamiccondition,themethodofcorrectingthewheelbalancecalleddynamicbalance.
⑤whatweuseinthisexperiment?
Themeasurementsystemincludesfourparts,sensors,signalconditioning,dataacquisitionsandresultdisplay.
1.2MeasurementSystemDesign
①Whatisproblem?
Theworkingbalanceofrotoriswidelyusedinmechanicalengineeringanditisveryimportantinmachinemanufacturing.Therefore,weshoulddosomeresearchtostudyit.
Inthisexperiment,theproblemmainlyincludetwoparts:
testingpartanddataacquisitionandanalysis.
Testingparthas:
Rotorvibration
Rotornoise
Figure6
Rotatespeed
ShaftCenterlineOrbit
Anddataacquisitionandanalysispartwewillgivesomedetailsandopinionsandalsoourimprovementforthisquestion.
②Howtosolveit?
Inthedetectingpart,weshoulddetecttherotorvibration,therotornoise,therotatespeedandtheshaftcenterlineorbit.Soweneedsomesensorstodetectthesignal.Thesensorsweneedisdisplacementsensortodetectthedisplacementofvibrationandthecenterlineorbit,thespeedsensorandtheaccelerationsensortodetectthevibration,theopticalsensortomeasurethespeedofshaftandthenoiselevelmetertomeasurethenoiselevel.
Asforthedataacquisition,wewilluseamachinecalleddatasignalcollectingdevice.Andfinally,thesignalwillbetransformedintosquarewaveanddisplayedinthecomputer.
Hereisthegenerallyframeofourdesign:
③Whatsensorcouldbeused?
(1)Photoelectricsensor
Insidethesensor,thereisaLEDlightwhichwillsendoutabeamoflightwhileworking.Andthelightwillbereflexedbythelightbarrierandreceivedbythereceptioninsidethesensor.Thenthesignalwillbeprocessedandconditionedbythediodeandaudition.Weusethiskindofsensortomeasuretherotatingspeedoftheshaft.
(2)
Electricalvortexsensor
Accordingtotheelectromagneticinductionprinciple,ifthereiselectricityinsidethecircularcoil,itwillcreateamagneticfield.Whiletheconductorisgettingcloserorfurther,therewillbeanothercircularelectricityintheconductorwhichwillalsocreateamagneticalfieldtoreducethefirstone.Weanalyzetheelectricityandwewillgetthedisplacementwhichtheconductorhasmoved.
Therefore,wecanusethissen
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