简介:本文基于自适应天线系统中的辨识信号到达方向AOA(AngleofArrival)关键问题,研究了其实现的MUSIC算法的原理,并通过MATLAB仿真分析,结果表明,接收信号个数必须小于阵元数才能用MUSIC算法进行波达方估计,MUSIC算法对于波达方向估计的分辨率在接近90°处为5°左右,在接近0°~180°处为5°~7°。
简介:基于Creator/Vega的屏蔽门控制系统的虚拟现实技术,建立屏蔽门系统的三维模型,重点研究仿真系统中屏蔽门、列车车门与信号系统的联锁控制,给出屏蔽门系统的故障模式,实现屏蔽门系统的电气特性。该设计方案已在大连快轨3号线的仿真测试中得到应用,证明能够满足与车门联锁驱动、实时监控以及故障处理的功能需求。
简介:Forstudyingthedynamicperformanceofsubseaumbilicalcablelayingsystemandachievingthegoalofcabletensionandlayingspeedcontrol,therigidfiniteelementmethodisusedtodiscreteandtransformthesystemintoarigid-flexiblecouplingmulti-bodysystemwhichconsistsofrigidelementsandspring-dampingelements.ThemathematicalmodelofsubseaumbilicalcablelayingsystemkinematicchainispresentedwiththesecondorderLagrangeequationinthejointcoordinatesystem,anddynamicmodelingandsimulationisperformedwithADAMS.Thedynamicanalysisisconductedassumingthefollowingthreestatuses:ideallaying,practicallayingunderwavedisturbance,andpracticallayingwithtensioncompensation.Resultsshowthatmotiondisturbancesofthelayingbudgeunderseawaves,especiallywithheavingandpitching,willcauserelativelyseriousfluctuationsincabletensionandlayingspeed.Tensioncompensation,i.e.,activebacktensiontorquecontrolcanrestrictcontinuoustensionincreasingordecreasingeffectivelyandrapidly,thusavoidingcablebreachorbuckling.