浮筏隔振系统动态特性建模与CAE系统开发

华中科技大学硕士学位论文浮筏隔振系统动态特性建模与CAE系统开发姓名：宋朝申请学位级别：硕士专业：机械设计及汽车工程指导教师：黄其柏20060425I(108KHz)MSC.PatranAutoSEAVC++IIAbstractTheconcealmentqualityisveryimportanttacticspropertyofshipment.asvibrationisolationdevices,thefolatraftsystemcansignificantlyreducevibrationleveltransferredfromthepowerunitstothebasementofshipment.Greatdealsofresearchesonthevibrationspecitydynamicanalysis,vibrationresponsecalculationofthissystemhavebeendone.However,thedisposalmethodofemulationcalculationresultofmiddlefrequencybandhasn’tbeenproposed.The“dividedfrequencybandmethod”,thatisadoptingfiniteelementmethodinlowfrequencyband,usingStatisticalenergyanalysismethodinhighfrequencyband,isproposedinthisdissertation,thefuzzymathematicsmethodisintroducedintotheemulationalresultdisposalprocess,thefuzzydisposalmethodofmiddlefrequencybandvibrationisolationeffectisproposedatthefirsttimetosolvethewidefrequencybandvibrationisolationeffectcalculationproblem.The“complexstiffnessmethod”,whichtranslatestheimpedancevaryingwiththefrequencyintothestiffnessanddampvaryingwiththefrequency,isadoptedtosimulatethevibrationisolatormorerealistically.Consideringtheneedofemulationalmodelingandvalidationoftheemulationmodel,thedynamicparameterexperimentalsystemissetuptotesttheimpedanceofbaseandvibrationisolator,accelerationlevelofmachines,modeofraftframeandvibrationlevelfallofvibrationisolationsystem.Theemulationalresultisprovedtomatchrightlywiththeexperimentalresultin10~8KHzfrequencyband.TheintegrationoffiniteelementsoftwareMSC.PatranandStatisticalEnergyAnalysissoftwareAutoSEAisproposedinthisdissertation.Themodelingandcalculationoffiniteelementmethod,StatisticalEnergymethodandfuzzymathematicsmethodaredevelopedintheViasualC++environmenttorealizethewidefrequencybandvibrationisolationeffectcalculationandimprovetheefficiencyandreliabilityofdynamicemulationalmodelingandanalysisoffloatraftsystem.Keywords:floatraftvibrationisolationsystem,fuzzymathematics,finiteelement,statisticalenergyanalysis,impedanceofvibrationisolator______111.1[1,2]1.121.11[3,4]2;3(108KHz);4.123345(108KHz)1.2506040dB701975198530dBXX,XX4(17)GLASGOW70215030016.5m14m:(31.5Hz-250Hz)35dB,(250Hz~l0kHz)50dB198619901990:1982(Tripartiteminehunter)MaritimeDefence19854Tripatiteminehunter'smainPropulsionsystem:.:;Hunt;:Lerici5Prof..Siedlecki3668:lkm[5~7]terfenol(PVDF)(PZT)()[8]6Benjeddou[9]FluidlasticMounts[10][11~30][31][32~34]()4.2m6.5m0.6m12.842dB35dB:30.3dB36.6dB6dB1997323:7(400-500r/min)596112km,2800km93[35][36]701[37][38]1.31.3.181231.3.21.3.3CAEMSC.PatranAutoSEAVC++CAEFRCAE(108KHz)CAECAE922.1[48]D12aDa=(2.1)dB(Vibrationleveldifference)(Transmissionloss)1210120020/20log()20log20log/20log()DaaaaaLDaaaaLLdBa===−=−(2.2)1aL2aL0a201/anms=[36]]101log[1011.0∑==niLaainL(2.3)-,aiL102.2MSC.PatranMSC.PatranMSC.Nastrana).b).2.1.112.11PointpointPATRAN0DMass(Lumped)Property(I11I21I22I31I32I33123xyz)PatranMPCMulti-PointConstraintRigid101KHz2100Hz100HzBushBushBush2.2ab[39~41]12fxγktjFefω=tjXexω=kfcfecka)b)2.2.xckxfffeck+=+=2.4tjFefω=jwxxXextj==,ω2.5ecT(2.6)∫∫==TeeddtxcdxxcW022.6)cos(),sin(ϕωωϕω−=−=tXxtXx∫=−=ωπωπϕωω/202222)(cosXcdttXcWeed2.7X2XWdα=2.8α13πωα=ec2.9γ(π2/dW)(2/2maxkXU=k)kUWdπαπγ==max22.10ecγωγkce=2.11xjkxcfedγ==xjkxckxfe)1(γ+=+=2.12cckkjkxfZ=+==−)1(γ2.13γγ2310~10−−γ0.55ckγIm()Re(),cckkkkγ==2.14Re()Im()142.143UnigraphicParaSolidx_tPatranTet10Tet1034Bush5PatranNastran11122122101000Hz1Hz9912.151/3]101log[101.0∑==fiufilfffinL2.15fi1/3fiufil,f152.3[42~46]2.32.31beam23AutoSEA4beam5162.25(160~8KHz)2.4500HzSEAAutoSEA3dB800Hz[160Hz,800Hz]2.4.11[160Hz,800Hz][160Hz,315Hz](315Hz,800Hz]17()()160Hzf315Hz()()315Hzf800Hz()FEfaASfbFEfbASfaTf×+×≤≤×+×≤=2.16()FEf()ASf()Tfa,b0.9,0.10.8,0.20.7,0.32()[()()]/2160800TfFEfASfHzfHz=+≤≤2.173{01}[01]160Hz800Hz[47]11601()1608001(160)0800FfHzfHzfHzfHzfβµα=≤≤+−2.18()1()AFffµµ=−2.1918f1/3,αβ(),()FAffµµ()()()()()FATfFEffASffµµ=×+×2.20,αβ122.12.112dB(Hz)FEfASfEXf16044.235.236.620052.246.944.125038.734.225.231557.351.947.740074.771.666.350079.472.870.863075.569.567.480070.165.961.22.20()Tf2min[()()]TfEXf−∑,αβ0.013406,0.78471αβ==2.21,αβ2.41920030040050060070080000.10.20.30.40.50.60.70.80.91Hz()Ffµ()Afµ2.42.4.212222.22.3202.212(Hz)FEfASfEXf(0.9,0.1)(0.8,0.2)(0.7,0.3)16037.030.436.636.335.735.033.737.020046.236.744.145.344.343.441.544.325029.017.625.227.926.725.623.325.431549.640.947.748.747.947.045.346.040070.561.666.362.563.464.366.166.150075.468.070.868.769.570.271.771.263072.167.967.468.368.769.270.069.580066.659.061.259.860.561.362.861.42.322(Hz)FEfASfEXf(0.9,0.1)(0.8,0.2)(0.7,0.3)16048.138.246.047.146.145.143.248.120054.347.653.053.653.052.351.053.025047.938.544.347.046.045.143.244.931558.249.254.657.356.455.553.754.540072.464.169.064.965.866.668.368.350070.363.566.964.264.965.566.966.563068.061.864.762.463.063.764.964.180070.962.263.963.163.964.866.665.02.52.6211220.030.040.050.060.070.080.0160200250315400500630800(Hz)(dB)(0.9,0.1)(0.8,0.2)(0.7,0.3)2.5122220.030.040.050.060.070.080.0160200250315400500630800(Hz)(dB)(0.9,0.1)(0.8,0.2)(0.7,0.3)2.6222.4.30.9,0.122(0.7,0.3)(0.8,0.2)2