開槽圓鋸片減振降噪機理研究.pdf

1、河北工業(yè)大學博士學位論文開槽圓鋸片減振降噪機理研究姓名：姚濤申請學位級別：博士專業(yè)：機械設計及理論指導教師：段國林20090301開槽圓鋸片減振降噪機理研究iiMECHANISMSTUDYONVIBRATIONNOISEREDUCTIONOFCIRCULARSAWWITHSLOTSABSTRACTThevibrationnoiseofcircularsawhasbeenanimptantpartthatpolluttheenvironm

2、ent.Inthepastfewdecadesalotofinvestigationswerededicatedtotheserelatedsubjects.Aseriesoftechnologyweregraspedthatcanreducevibrationnoiseincludingstructureimproveddesignvibrationcontrolintheprocessofcuttingdampingcircular

3、sawbladeetc.Theinitialpurposeofslotsholeswastoreducethecompressedthermalstressthatisresultedfromtemperaturegradient.Practiceshowsthatslottingfillingmaterialseffectivewayofreducingvibrationnoise.Howeverbecausecomplexmecha

4、nicalacousticproblemexistintheprogressofvibrationofcircularsawthetotalsystematicresearchesonvibrationnoiseofcircularsawbladewithslotsfillingmaterialshavebeenstillratherrare.UptonowNoaccuratetheyhasbeenusedtoexplaintheeff

5、ectofslottocircularsawblade.ItbecomesabottleneckofthistypeofSaw’sinnovation.Duetotheabovereasonsnumericalanalysisexperimentalstudyhavebeenconductedinthisthesiswhichstemmedfromthemechanismofvibrationnoiseofcircularsaw.Thr

6、oughdiscussingtheinfluenceofslotparameterstovibrationacteristicofcircularsawoptimizationmethodhasbeenprovided.Theresearchprovidestheeticalguidancefrelevantbladesenterprises.Themainwkwillbeconcludedasfollows:(1)Theequatio

7、nofvibrationofcircularsawbladewithoutanyslotisestablishedincombinationwithplatekiiesthey.NaturalfrequancyoffreevibrationoncommancircularsawbladearecalculatedbasedonMATLABprogram.TheresultcomparedwithFEA.Thedynamicacteris

8、ticofcircularsawbladeswithradialslotsontheouteredgeareinvestigated.Thedistributionofnaturalfrequencyisstudiedbasedonsmallparameterperturbationthey.(2)Bytakingvibrationacteristiccircularsawwithmatrixslotsastheresearchobje

9、ctwhichcanbedividedtwocategies:radialslotsannularslots.Theparametersofslotaffectingtheperfmanceofsawbladevibrationbyanalyzingwereidentifiedwhichincludethelocationwidthlengthnumberofslots.Theeffectofslotparameterstonatura

10、lacteristicisdiscussedbyFEAmethod.Bytakingdampinglossfactasavibrationdampingevaluationwhichwerecalculatedbasedonmodalstrainenergymethod.(3)Thetransientdynamicacteristicofcommoncircularsawsawbladewithfillingmaterialsinslo

11、tsisstudiedthroughFEAmethods.Thevibrationresponseattenuationhistyoftwocirculawsawarecompared.TheresultsofFEAwillbeverifiedbyhammeringexperimental.Thenumberedanalogsimulationintheprogressofcuttingonthreedifferentcirculars

12、aw(withoutanyslotwithslotswithfillingmaterialsinslots)areconductedby“movingload”technology.Theresponseofcircularsawarecompared.IndertoverifytheeffectivenessofFEAcuttingexperimentsareconducted.Throughcomparingnoisepowerle