开槽圆锯片减振降噪机理研究

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1、河北工业大学博士学位论文开槽圆锯片减振降噪机理研究姓名：姚涛申请学位级别：博士专业：机械设计及理论指导教师：段国林20090301开槽圆锯片减振降噪机理研究MECHANISMSTUDYONVIBRATIONANDNOISEREDUCTIONOFCIRCULARSAWWITHSLOTSABSTRACTThevibrationandnoiseofcircularsawhasbeenanimportantpartthatpolluttheenvironment.Inthepastfewdecades,alotofinvest

2、igationswerededicatedtotheserelatedsubjects.Aseriesoftechnologyweregraspedthatcanreducevibrationandnoise,includingstructureimproveddesign,vibrationcontrolintheprocessofcutting,dampingcircularsawbladeetc.Theinitialpurposeofslotsandholeswastoreducethecompressedthe

3、rmalstressthatisresultedfromtemperaturegradient.Practiceshowsthatslottingandfillingmaterialseffectivewayofreducingvibrationandnoise.However,becausecomplexmechanicalandacousticproblemexistintheprogressofvibrationofcircularsaw,thetotalandsystematicresearchesonvibr

4、ationandnoiseofcircularsawbladewithslotsandfillingmaterialshavebeenstillratherrare.Uptonow,Noaccuratetheoryhasbeenusedtoexplaintheeffectofslottocircularsawblade.ItbecomesabottleneckofthistypeofSaw’sinnovation.Duetotheabovereasons,numericalanalysisandexperimental

5、studyhavebeenconductedinthisthesis,whichstemmedfromthemechanismofvibrationandnoiseofcircularsaw.Throughdiscussingtheinfluenceofslotparameterstovibrationcharacteristicofcircularsaw,optimizationmethodhasbeenprovided.Theresearchprovidestheoreticalguidanceforrelevan

6、tbladesenterprises.Themainworkwillbeconcludedasfollows:(1)Theequationofvibrationofcircularsawbladewithoutanyslotisestablishedincombinationwithplatekinetiestheory.NaturalfrequancyoffreevibrationoncommancircularsawbladearecalculatedbasedonMATLABprogram.Theresultco

7、mparedwithFEA.Thedynamiccharacteristicofcircularsawbladeswithradialslotsontheouteredgeareinvestigated.Thedistributionofnaturalfrequencyisstudiedbasedonsmallparameterperturbationtheory.(2)Bytakingvibrationcharacteristiccircularsawwithmatrixslotsastheresearchobjec

8、t,whichcanbedividedtwocategories:radialslotsandannularslots.Theparametersofslotaffectingtheperformanceofsawbladevibrationbyanalyzingwereidentifiedwhichincludethelocat