简介:Sometimesmaindrivermotors’torqueexceedsthemaximumlimitinBaosteel’s5mheavyplatemill.Experienceshowedthattorqueoverloadedoccurredincasesofsomespecialrollingsequenceandspecialrollingplatedimension.Mostoftheoverloadedoccurredonlyinstantaneousatsometimepointduringtherollingpass,whichespeciallyeasilyhappenedatthebiteandmotoraccelerationtimeafterthebite.Thispaperanalyzestheimpactfactorsformotortorqueoverloadandcarefullystudiesthekeydetailsofthemillrollingspeedcontrol.Thesolutiontoimprovethespeedcontrolwasgivenatthepreconditionofkeepingproductionyield.Theimplementationofthesolutionsignificantlyreducedtheoccurrenceoftorqueoverloadedtimes.
简介:Inputtorqueisthemainpowertomaintainbipedalwalkingofrobot,andcanbecalculatedfromtrajectoryplanninganddynamicmodelingonbipedrobot.Duringbipedalwalking,theinputtorqueisusuallyrequiredtobeadjustedduetosomeuncertainparametersarisingfromobjectiveorsubjectivefactorsinthedynamicalmodeltomaintainthepre-plannedstabletrajectory.Here,aplanar5-linkbipedrobotisusedasanillustratingexampletoinvestigatetheeffectsofuncertainparametersontheinputtorques.Kine-maticequationsofthebipedrobotarefirstlyestablishedbythethird-ordersplinecurvesbasedonthetrajectoryplanningmethod,andthedynamicmodelingisaccomplishedbytakingboththecertainanduncertainparametersintoaccount.Next,severalevaluationindicesoninputtorquesareintro-ducedtoperformsensitivityanalysisoftheinputtorquewithrespecttotheuncertainparameters.Finally,basedontheMonteCarlosimulation,thevaluesofevaluationindicesoninputtorquesarepresented,fromwhichalltherobotparam-etersareclassifiedintothreecategories,i.e.,stronglysensi-tive,sensitiveandalmostinsensitiveparameters.
简介:在这篇论文,无传感器的转矩为混合电的车辆(HEV)的正式就职马达的柔韧的追踪问题应用被探讨。因为在HEV应用程序的马达参数变化比在工业驱动器系统大,常规面向地的控制(FOC)提供差的性能。因此,FOC控制器的新柔韧的基于PI的延期和一个速度流动观察员基于滑动模式和Lyapunov理论被开发以便改进全面表演。模拟结果证明建议无传感器的转矩控制计划关于马达参数变化和装载骚乱是柔韧的。另外,马达的操作流动最佳地被选择最小化电能的消费,它在模拟显示出的精力损失导致重要减小。关键词混合电的车辆-正式就职马达-追踪的转矩-滑动模式这个工作被追求中国(号码2001BA204B01)的工程的州的科技部分地支持。刘燕是Dalian大学的信息工程的学校的一个教授。她在Dalian工业大学在控制理论和应用程序为工业科学度的医生正在完成要求,Dalian。她的研究兴趣包括控制并且建模,参数评价,电的机器的失败察觉,和为正式就职马达的faulttolerant控制在汽车的应用程序开车。邵成是先进控制技术的研究院的一个教授,Dalian工业大学。他的研究兴趣为工业过程包括柔韧的适应控制,聪明的学习控制,和优化控制。
简介:Background:Theisometricsteady-statefollowingactivelengtheningisassociatedwithgreatertorqueproductionandloweractivation,asmeasuredbyelectromyographicactivity(EMG),incomparisonwithapurelyisometriccontraction(ISO)atthesamejointangle.Thisphenomenonistermedresidualforceenhancement(RFE).WhiletherehasbeenagreatdealofresearchinvestigatingthebasicmechanismsofRFE,littleworkhasbeenperformedtounderstandtheeverydayrelevanceofRFE.ThepurposeofthisstudywastoinvestigatewhetherneuromuscularcontrolstrategiesdifferbetweenISOandRFEbymeasuringtorquesteadinessofthehumanankleplantarflexors.Methods:FollowingISOmaximalvoluntarycontractionsin12males(25±4years),anactivelengtheningcontractionwasperformedat15°/sovera30°ankleexcursion,endingatthesamejointangleasISO(5°dorsiflexion;RFE).SurfaceEMGofthetibialisanteriorandsoleusmuscleswasrecordedduringalltasks.Torquesteadinesswasdeterminedasthestandarddeviation(SD)andcoefficientofvariation(CV)ofthetorquetraceintheISOandRFEconditionduringactivation-matching(20%and60%integratedEMG)andtorque-matching(20%and60%maximalvoluntarycontraction)experiments.Two-tailed,pairedttestswereused,withinsubjects,todeterminethepresenceofRFE/activationreduction(AR)andwhethertherewasadifferenceintorquesteadinessbetweenISOandRFEconditions.Results:Duringthemaximalandsubmaximalconditions,therewas5%-9%RFEwitha9%-11%AR(p〈0.05),respectively,withnodifferenceinantagonistcoactivationbetweenRFEandISO(p〉0.05).TherewerenodifferencesinSDandCVofthetorquetraceforthe20%and60%activation-matchingorthe60%andmaximaltorque-matchingtrialsineithertheRFEorISOcondition(p〉0.05).Duringthe20%torquematchingtrial,therewere~37%highervaluesforSDandCVintheRFEascomparedwiththeISOcondition(p〈0.05).Asignificantmoderate-to-strongnegativerelatio
简介:Inthispaper,wedevelopatheoreticalmethodbasedonrayopticstocalculatetheopticalforceandtorqueonametallo-dielectricJanusparticleinanopticaltrapmadefromatightlyfocusedGaussianbeam.TheJanusparticleisa2.8μmdiameterpolystyrenespherehalf-coatedwithgoldthinfilmseveralnanometersinthickness.ThecalculationresultshowsthatthefocusedbeamwillpushtheJanusparticleawayfromthecenterofthetrap,andtheequilibriumpositionoftheJanusparticle,wheretheopticalforceandtorquearebothzero,islocatedinacircularorbitsurroundingthelaserbeamaxis.Thetheoreticalresultsareingoodagreementqualitativelyandquantitativelywithourexperimentalobservation.Astheray-opticsmodelissimpleinprinciple,userfriendlyinformalism,andcosteffectiveintermsofcomputationresourcesandtimecomparedwithotherusualrigorouselectromagneticsapproaches,thedevelopedtheoreticalmethodcanbecomeaninvaluabletoolforunderstandinganddesigningwaystocontrolthemechanicalmotionofcomplicatedmicroscopicparticlesinvariousopticaltweezers.
简介:【摘要】:本文主要通过运动学仿真分析得到底盘紧固件的极限载荷,再根据极限载荷计算螺栓的强度等级和规格,最终确定紧固件预紧力的大小和拧紧力矩。
简介:这篇论文由电压来源在高力量的感应电动机美联储为全部的泛音电流失真(THCD)的最小化论述基因算法(GA)的强大的应用转换ers,基于一个近似泛音模型。也就是说定义一个需要的基础输出电压,当最小化THCD时,最佳的脉搏模式(切换的角度)决心生产基本产量电压。在脉搏宽度调整(PWM)的开始的1/4个时期的三和五切换的片刻的二个盒子的完全的结果波形被介绍。在定子刺激的泛音的存在导致一个阿富汗辅币转矩部件。就如果阿富汗辅币转矩在低频率,他们能在反馈控制系统引起麻烦速度变化,柄疲劳,和不能令人满意的性能的事实而言,第5,第7,第11,并且第13当前的泛音(在五个切换的角度的情况中)在一些预先指定的价值被抑制,减轻低频率的泛音的有害效果。同时,当要求的基本产量电压被维持时,THCD被优化。
简介:Thispaperdealswiththedesignofanoutputfeedbackpredictivecontrollerforinductionmotors.Thefundamentalinterestoftheproposedcontrolleristhecapabilityofdecouplingthemechanicalspeedandtherotorfluxes,withoutdegradationagainstthevariationofrotorresistanceandloadtorque.Hence,thecontributionistoapplytwoestimationproceduresinordertoachievethisgoal.Namely,anunknowninputobserver(UIO)isusedfortheconstanttimeestimationwhereasaheuristicsolutionisexploitedfortheloadtorqueupdate.Moreover,rotorfluxcomponentsarerecoveredasanunavailablestateofthesystem.Effectivenessoftheproposedobserversandtheperformanceofthecontrollerareconfirmedbysimulationresults.