简介:有抑制使用橡胶磁性的粉末(DRM)的材料的一根伸臂横梁被调查了。二个方法被选择保持DRM到一根颤动的钢横梁,一个人是由粘合剂结合由磁性的吸引人的力量(叫的DRM横梁)和其它依附DRM(叫的AB-DRM横梁)。与引起由的AB-DRM横梁的抑制性质不同砍抑制材料的变丑,DRM横梁的抑制性质被滑动描绘和抑制材料的内部损失的摩擦损失。作者建立了明确的表达预言DRM横梁的抑制特征,它试验性地被验证。橡胶材料损失因素尾在抑制DRM横梁对AB-DRM横梁的改进上有明确的影响,这被发现。如果尾是比在0.8255附近的批评价值小的,振动振幅的一个有效范围总是在在哪个DRM,横梁能完成比AB-DRM横梁的更好的抑制存在;相反地,如果尾比批评价值大,当幻灯片发生时,有效范围不存在。如此的结果被用来决定DRM的优点和限制并且开发设计指南。
简介:Thefirstorderdifferentialmatrixequationsofthehostshellandconstrainedlayerforasandwichrotationalshellarederivedbasedonthethinshelltheory.Employingthelayerwiseprincipleandfirstordersheardeformationtheory,onlyconsideringtheshearingdeformationoftheviscoelasticlayer,theintegratedfirstorderdifferentialmatrixequationofapassiveconstrainedlayerdampingrotationalshellisestablishedbycombiningwiththenormalequilibriumequationoftheviscoelasticlayer.Ahighlyprecisetransfermatrixmethodisdevelopedbyextendedhomogeneouscapacityprecisionintegrationtechnology.Thenumericalresultsshowthatpresentmethodisaccurateandeffective.
简介:Itiswidelyknownthattheseismicresponsecharacteristicsofasoilsitedependsheavilyonseveralkeydynamicpropertiesofthesoilstratum,suchaspredominantfrequencyanddampingratio.Awidelyusedmethodforestimatingthepredominantfrequencyofasoilsitebyusingmicrotremorrecords,proposedbyNakamura,isinvestigatedtodetermineitseffectivenessinestimatingthedampingratio.TheauthorsconductedsomemicrotremormeasurementsofsoilsitesinHongKongandfoundthatNakamura'smethodmightalsobeusedtoestimatethedampingratioofasoilsite.DampingratiodatafromseveraltypicalsoilsiteswereobtainedfrombothNakamura'sratiocurvesusingthehalfpowerpointmethodandresonantcolumntests.Regressionanalysisindicatesthatthereisastrongcorrelationbetweenthedampingratiosderivedfromthesetwodifferentapproaches.
简介:TheregularsolutionsoftheisentropicEulerequationswithdegeneratelineardampingforaperfectgasarestudiedinthispaper.Andacriticaldegeneratelineardampingcoefficientisfound,suchthatifthedegeneratelineardampingcoefficientislargerthanitandthegasliesinacompactdomaininitially,thentheregularsolutionwillblowupinfinitetime;ifthedegeneratelineardampingcoefficientislessthanit,thenundersomehypothesesontheinitialdata,theregularsolutionexistsglobally.
简介:ThepaperdealswiththestronglydampednonlinearwaveequationofKirchhofftype.Theexistenceofaglobalattractorisprovenbyusingthedecomposition,andmoreover,thestructureoftheglobalattractorisestablished.Ourresultsimprovethepreviousresults.
简介:Usingthewavepackettheory,weobtainallthesolutionsoftheweaklydampednonlinearSchrodingerequation.Thesesolutionsarethestaticsolution,andsolutionsofplanarwave,solitarywave,shockwaveandellipticfunctionwaveandchaos.Thebifurcationphenomenonexistsinbothsteadyandnon-steadysolutions.Thechaoticandperiodicmotionscancoexistinacertainparametricspaceregion.
简介:Aprecisetangentialcontactdampingmodelisproposed,whichincludesthelateralcontactoftheupper-lowerasperitiesandtheinteractionofadjacentasperities.Theeffectsofthenormalstaticpreload,frequency,andamplitudeoftangentialdisplacementonthetangentialcontactdampingwereanalyzedbysimulation,respectively.Furthermore,theresultsofsimulationareverifiedbyexperiment.Thetangentialcontactdampingofconsideringtheinteractionandlateralcontactofasperityisveryclosetotheexperimentalresults.
简介:Thetensile-shearfailurezoneofthelaminateddampingsteelsheetwasinvestigatedbyscanningelectronmicroscopyandX-rayphotoelectronspectroscopy.Itisfoundthatthereexistscohesivefailureinpolymersandwichandsub-boundaryfailurebetweenthesteelsheetandthepolymer.Thesub-boundarylayerisdominantlypolymermaterial.Thetensile-shearfailureofthelaminateddampingsteelsheetisaprocessduringwhichthecrazesform,growupandmergeintocracks.
简介:Inthispaper,weconsiderthepartialdifferentialequationofanelasticbeamwithstructuraldampingbyboundaryfeedbackcontrol.First,weprovethisclosedsystemiswell--posed;thenweestablishtbeexponentialstabilityforthiselasticsystembyusingatheoremwhichbelongstoF.L.Huang;finally,wediscussthedistributionandmultiplicityofthespectrumofthissystem.Theseresultsareveryimportantandusefulinpracticalapplications.
简介:Theseriescomposedbybeammodefunctionisusedtoapproximatethedisplacementfunctionofconstraineddampingoflaminatedcantileverplates,andthetransversedeformationoftheplateonwhichaconcentratedforceisactediscalculatedusingtheprincipleofvirtualwork.BysolvingLagrange'sequation,thefrequenciesandmodellossfactorsoffreevibrationoftheplateareobtained,thenthetransientresponseofconstraineddampingoflaminatedcantileverplateisobtained,whentheconcentratedforceiswithdrawnsuddenly.Thetheoreticalcalculationsarecomparedwiththeexperimentaldata,theresultsshow:boththefrequenciesandtheresponsetimeoftheoreticalcalculationanditsvariationallawwiththeparametersofthedampinglayerareidenticalwithexperimentalresults.Also,theresponsetimeofsteelcantileverplate,unconstraineddampingcantileverplateandconstraineddampingcantileverplatearebroughtintocomparison,whichshowsthattheconstraineddampingstructurecaneffectivelysuppressthevibration.
简介:<正>AnonlinearhingedextensibleelasticbodyequationwithstrongstructuraldampingandBalakrishnan-Taylordampingoffullexponentisstudiedasageneralmodelforlargespacestructuresofhigherdimensions.Inthispaper,theabsorbingsetsandfiatinertialmanifoldareobtainedforthisnonlinearbodyequation.Thecontrolspilloverproblemassociatedwiththestabilizationofthisequationisresolvedbyconstructingalinearfinitedimensionalfeedbackcontrolbasedontheexistenceofinertialmanifoldsoftheuncontrolledequation.Moreover,theresultsobtainedarerobustwithrespecttotheuncertaintyinstructuralparameters.
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简介:Theinfluenceofthevolumefractionoftemperedmartensiteonmagnetomechanicaldampingoftheferriticmatrixindual-phasealloyswasstudied.Theexperimentalresultsshowedthat(1)dual-phasedampingalloyisofgoodcombinationofstrengthandtoughness:(2)gooddampingca-pacity(Q-1≥5.0×10-3)canbeobtainedindual-phasealloysonlywhenthevolumefractionoftemperedmartensitewascontrolledproperly.Theeffectofmartensiteonmagnetomechanicaldamp-ingoftheferriticmatrixwasanalysed.Thedampingcapacityofdual-phasealloyswasrelatedtothevolumefractionVmoftemperedmartensitebyQ-1=Q-1(1-Vm/1+BVm)atsmallvibrationstrainamplitudesεA≤5.0×10-6.
简介:Asisalreadyknown,mostoftheplasmaliteratureisoccupiedwiththeplasmainstabilitiesandtheinevitableplasmawaves,whichremainmajorobstaclestothethermonuclearfusionprocess.Manyexperimentaldataontheplasmawaves(growthordamping)andtheiraccompaniedtheoreticalinterpretationshavebeenpublishedduringthelastfivedecades;lotsofthemhavebeenidentifiedandjustifiedaswell,somenotyet.Oneoftheseisourpreviousresearchonplasmawaves,whichoriginatedintheearly80'satthePlasmaPhysicsLaboratoryoftheNCSR'Demokritos'.Asthewaverisingisdefinedbythegrowthrate(orthedampingontheextinguishment),theseimportantwavyquantitieswillbestudiedindetailinthepresentpaper.Threeexamplesaretakenfromourprevioustheoreticalresults,andthefirstobservationrevealsthattheinvolvedquantitiesarecomplicatedenoughtobestudiedbythemselves.So,theuseofsuitableapproachmodels,whichmayinterprettheexperimentalwavyquantities,isthecentralideaofthepresentattempt.Furthermore,calculationswithalittlechangeoftheinitialconditionshavebeenrepeatedinordertodeterminewhethertheplasmabehavesasachaoticmedium.
简介:A为称为“变弱并且抑制的技术”的存在大楼翻新过程(结合)在这篇论文被介绍。结构变弱能在严重地面运动期间限制最大的反应加速,但是在排水量或内部故事的飘移导致增加。由使用抑制增加粘滞在另一方面,水坝pers减少内部故事的飘移并且没在全部的加速上有重要效果,结构什么时候有弹性地表现在。变弱并且抑制的技术在结构为结构、非结构的损坏探讨二个主要原因。变弱翻新对结构特别地合适在强调部件和弱易碎的部件上。在这篇论文,WeD的优点被非线性的动态分析验证并且简化光谱被修改了到的途径与另外的抑制适合结构设备。在加利福尼亚位于圣Fernando山谷的医院结构作为案例研究被选择。从两分析的结果证明retrofit溶液是可行的减少结构的加速和排水量。敏感分析也被执行通过脆弱分析在加速和排水量用表演阀值的不同联合评估翻新的方法的有效性。
简介:Thequasilinearhyperbolicequationwithnonlineardampingisconsideredinthispaper,anewasymptoticprofileforthesolutiontotheequationisobtainedbysuitablychoosingtheinitialdataofthecorrespondingparabolicequation,theconvergenceratesofthenewprofilearebetterthanthatobtainedbyNishihara(1997,J.DifferentialEquations137,384-395)andH.-J.Zhao(2000,J.DifferentialEquations167,467-494).