简介：有多重时间延期的一个灵活伸臂盘子的活跃控制用分离最佳的控制方法被调查。有多重时间延期的一个控制器被介绍。在这个控制器，时间延期效果在整个控制设计和没有近似在动态系统的数学模型被合并，假设在控制器推导被做，因此系统稳定性容易被保证。而且，这个控制器为两小时间延期和大时间延期是可得到的。建议控制器的可行性和效率这份报纸最后通过数字模拟被验证。

简介：ThepreviouspaperreportedanewderivativeintheEuleriandescriptioninflatspace—thegeneralizedcovariantderivativeofgeneralizedEuleriancomponentwithrespecttotime.ThispaperextendsthethoughtfromtheEuleriandescriptiontotheLagrangiandescription:onthebasisofthepostulateofcovariantforminvariabilityintimefield,wedefineanewderivativeintheLagrangiandescriptioninflatspace—thegeneralizedcovariantderivativeofgeneralizedLagrangiancomponentwithrespecttotime.Besides,thecovariantdifferentialtransformationgroupissetup.ThecovariantforminvariabilityofLagrangianspace-timeisascertained.

简介：ThispaperreportsanewderivativeintheEuleriandescriptioninflatspace-thegeneralizedcovariantderivativewithrespecttotime.Thefollowingcontentsareincluded:(a)therestrictedcovariantderivativewithrespecttotimeforEuleriancomponentisdefined;(b)thepostulateofthecovariantforminvariabilityintimefieldissetup;(c)thegeneralizedcovariantderivativewithrespecttotimeforgeneralizedEuleriancomponentisdefined;(d)thealgebraicstructureofthegeneralizedcovariantderivativewithrespecttotimeismadeclear;(e)thecovariantdifferentialtransformationgroupintimefiledisderived.TheseprogressesrevealthecovariantforminvariabilityofEulerianspaceandtime.

简介：Stress-dependenceoftheintrinsictimeofviscoelasticmaterialsisinvestigated.Theinfluenceofstresslevelontheintrinsictimeisconsideredtobesimilartothatoflemperature,pressure,solventcon-centration,damageandphysicalaging.Thetime-lemperature-stressequivalenceprincipleisproposed,byemployingwhich,thecreepcurvesatdifferenttemperaturesandstresslevelscanbeshiftedintoamastercurveatreferencetemperatureandstresslevel.Thusthelong-termcreepbehaviorofviscoelasticmaterialsatalowertemperatureandstresscanbepredictedfromtheshort-termoneatahighertemperatureandstress.Asanexample,thenonlinearcreepbehaviorofhigh-densitypolyethylene(HDPE)atroomtemperatureisstudiedusingthetime-temperature-stressequivalenceprinciplepresented.

简介：非线性粘弹性爬性质(甲基methacrylate)poly在短期的测试在各种各样的温度和压力层次被测量检查time-temperature-stress重叠原则的适用性，它是时间温度重叠的联合形式原则和时间压力重叠原则。一位统一主人爬依从曲线被时间温度重叠和时间压力重叠的联合申请从短期的测试构造。统一主人曲线在二年建立creep依从，它比测试持续时间长4.2十年。而且，在非线性的粘弹性的盒子中，时间温度移动因素依赖于移动在被使用的压力，这被验证，当时间压力移动因素依赖于温度时。

简介：受到时间依赖者脉搏的一个把压成薄片的混合合成盘子的非线性的动态回答被调查。板的动态方程被虚拟工作原则的使用导出。几何非线性效果与vonK獲愠敲搠灥湥敤瑮漠?瑳敲獳獥愠?桷捩?桴?桳晩獴愠敲愠灰楬摥?桷汩?桴?楴敭猭牴獥?桳晩?慦瑣牯?牡?敤数摮湥?湯琠浥数慲畴敲s被考虑

简介：Thenonlinearbehaviorofacantileveredfluidconveyingpipesubjectedtoprincipalparametricandinternalresonancesisinvestigatedinthispaper.Theflowvelocityisdividedintoconstantandsinusoidaiparts.Thevelocityvalueoftheconstantpartissoadjustedsuchthatthesystemexhibits3:1internalresonancesforthefirsttwomodes.Themethodofmultiplescalesisemployedtoobtaintheresponseofthesystemandasetoffourfirst-ordernonlinearordinary-differentialequationsforgoverningtheamplitudeoftheresponse.TheeigenvaluesoftheJacobianmatrixareusedtoassessthestabilityoftheequilibriumsolutionswithvaryingparameters.Thecodimension2derivedfromthedouble-zeroeigenvaiuesisanalyzedindetail.Theresultsshowthattheresponseamplitudemayundergosaddle-node,pitchfork,Hopf,homoclinicloopandperiod-doublingbifurcationsdependingonthefrequencyandamplitudeofthesinusoidalflow.Whenthefrequencyofthesinusoidalflowequalsexactlyhalfofthefirst-modefrequency,thesystemhasaroutetochaosbyperiod-doublingbifurcationandthenreturnstoaperiodicmotionastheamplitudeofthesinusoidalflowincreases.