简介:Inthispaper,aLotka-Volterracooperationsystemwithsinglefeedbackcontrolisproposedandstudied.Weinvestigatethelocalstabilityandtheglobalstabilityofthesystem.Ourstudyshowsthatwithsuitablerestrictiononthecoefficientsofthefeedbackcontrolvariable,thesystemcanstillremaingloballystableorbecomeextinct,whichshowsthatthefeedbackcontrolvariableplaysaveryimportantroleinthedynamicsbehaviorsofthesystem.
简介:In4-strokeinternalcombustionengines,air-fuelratiocontrolisachallengingtaskduetotherapidchangesofenginethrottle,especiallyduringtransientoperation.Toimprovethetransientperformance,managingthecycle-to-cycletransientbehaviorofthemassoftheair,thefuelandtheburntgasisakeyissueduetotheimbalanceofcycliccombustionprocess.Thispaperaddressthemodel-basedestimationandcontrolproblemforcyclicair-fuelratioofspark-ignitionengines.Adiscrete-timemodelofair-fuelratioisproposed,whichrepresentsthecycle-to-cycletransientbehaviorofin-cylinderstatevariablesundertheassumptionsofcyclicmeasurabilityofthetotalin-cylinderchargemass,combustionefficiencyandtheresidualgasfraction.Withthemodel,aKalmanfilter-basedair-fuelratioestimationalgorithmisproposedthatenableustoperformafeedbackcontrolofair-fuelratiowithoutusinglambdasensor.Finally,experimentalvalidationresultisdemonstratedtoshowtheeffectivenessofproposedestimationandcontrolschemethatisconductedonafull-scaledgasolineenginetestbench.
简介:Arandomdistributedfeedbackfiberlaserwithlinearpolarizedoutputat1178nmispresented.Linearpolarizationisrealizedbyfibercoilinginahalf-openedcavityofapolarizationmaintainingrandomfiberlaserstructure.Thesinglelinearpolarizationlaseroutputpowerreaches~3Wwithpolarizationextinctionratio>14dB.Furtherinvestigationsonthecoilingtechniqueandadditionalfeedbackarealsostudied.Sofarasweknow,thisisthefirstreportedlinearpolarizedrandomdistributedfeedbackRamanfiberlaser.
简介:我们考虑在基于测量的反馈控制和隧道被考虑的decoherence的二个原型的类下面受到一条噪音隧道的一个开的量系统:阶段抑制并且概括振幅抑制。基于量轨道理论,我们面对反馈控制为减少的系统的动力学获得一个扩大主人方程。为一个qubit系统我们经分解解决这个主人方程并且获得州的向量动力学的解决方案。然后,我们为准备任意的量建议一个有效反馈控制计划纯状态。我们也学习怎么有效地保护二个nonorthogonal状态,并且发现有不偏的基础的射影的测量不为这项任务是最佳的,当有偏导的基础的弱测量能认识到二个nonorthogonal状态的最好的保护时。而且,在反馈过程的无效也被讨论。