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1、Title:OscillationofaTorsionalSpringAuthor:WadeW.BernreuterLabPartner:ErinEddyDate:10/19/99Purpose:TostudytorsionaloscillationusingLabviewandcomputerdatacollection.Theory:Supposealargesymmetricrotationmasshasarotationalinertia,J,andatwistingrodhasatorsionalspringcoefficient,K.Rec
2、allthebasictorsionalrelationships.WecancalculatethetorsionalspringcoefficientusingthebasicmechanicsofmaterialsFinally,considertherotatingmassontheendofatorsionalrod.Equipment:1-tableclamp1-computerwithLabViewandMathCadsoftware1-LabViewdataacquisitioncard1-potentiometer1-weightsc
3、ale1-protractor1-25”longtorsionalspring2-24”x4”x4”aluminumbarmassesfastenedtospring1–0to3000gramweightscale1–table1-stopwatchProcedure:1.Assemblethetorsionalspringandrotatingmass.ProgramLabViewtoreadtherotationofthespringwithvaryingvoltagebymeansofthepotentiometer.Attachthepoten
4、tiometertotheaxisofrotationofthetorsionalspring.Clampthespringandmasstothetable.2.Pulltheendofthemasswithasetamountofforceasdeterminedbytheweightscaleandmeasuretheamountofrotationwiththeprotractorandvoltagedifferencefromthepotentiometer.Startrecordingthevoltageoutputofthepotenti
5、ometerwithLabViewandreleasethescale.Timetheamountthatisnecessaryfortwentyrotationsinordertodeterminethefrequencyofthetorsionalspring.3.Repeatstep2forotherforcestodeterminevariancesindataandtoensurethatlegitimatedatawasaccumalated.Results:Graphsdepictingtheoscillationsarebelowfor
6、eachforceapplied:
