轨枕支撑硬点对轨枕动力响应的影响.pdf

2007年度全国铁路机车车辆动态仿真学术会议论文集轨枕支撑硬点对轨枕动力响应的影响肖新标,金学松,温泽峰(西南交通大学牵引动力国家重点实验室,四川成都610031) 摘要:建立了基于Timoshenko粱模型的车辆/轨道耦合动力学模型,分析轨枕支撑硬点对轨枕动力响应的影响. 轨道采用三层弹性离散点支捧模型,钢轨被视为离散轨枕支撑上的无限长Timoshenko粱。通过假设轨道下轨枕垂向支搏高度沿纵向非均匀分布来模拟轨枕支撑硬点,采用移动轨下支撑模型来分析其对系统动力响应的影响. 模型中考虑钢轨横向、垂向和扭转运动对轮轨滚动接触蠕滑率的影响,利用Hertz法向接触理论和沈氏蠕滑理论分别计算轮轨法向力及轮轨滚动接触蠕滑力。应用新型显式积分法对车辆/轨道耦合动力学系统运动方程进行求解。通过数值方法,分析计算了不同的轨枕支撑硬点个数和高度对车辆/, 轨枕支撑硬点对车辆系统动力响应的影响很小,对轨道系统动力响应的影响较显著,。支撑硬点处钢轨/轨枕问作用力和最靠近硬点区段的轨枕支撑处的钢轨/轨枕拉力迅速增大,将加速轨枕、轨下垫层及钢轨扣件状况的恶化。而支撑硬点个数对系统动力响应的影响很小. 关键词:轨枕;轨道;车辆;耦合动力学;动力响应;硬点 Effect ofHard Spot on dynamic response ofRailway Sleeper XIAO Xin—biao,JINXue—song,WEN Ze—feng (State KeyLaboratoryofTractionPower,Southwest JiaotongUniversity,Chengdu 610031。SichuanChina) Abstract:In order investigate theeffectofhard spot dynamic response ofrailway sleeper,a vehicle-trackcoupling dynamic model established,inwhichthetrack modeled asa3-layer discrc,e elasticsupport model andtherailsa他 assumed tobeT'unosbenko beamsresting on hardspot ofsleepersupport underme rails simulatedbynon-uniform heightofsleepcrsupportalong thetrack,and effecton thecouplingdynamics oftbe vehicle and track taken into consideration by thebackward moving thedynamic model,the effectofthevertical andlateralmotions ofthetrack on thewheel-railcreepages taken normal forcesofwheel/railare calculatedby Henzian contactthcory andthecrop forces ofwheel/rail rolling contact aredecidedby thenonlinear creep theory ofShen equations ofthevehicle/trackcouplingsystem aresolved wim the new explicit integration ofnumber andheight ofhard ondynamic response ofcoupled vehicle/tracksystem numerical resultsindicatethmhardspotgreatly affe蛾sdynamic response of tracksystem ratherthan vehiclesystem,especially increasing theheight ofhardspot,theraii/sleepor pressure forces theregion ofhardspot and therail/sleeper tension forces the nearestsleeper