桥墩沉降下山地齿轨车辆基本振动特性

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关键词：齿轨铁路；齿轮-齿轨动力学；桥墩沉降；列车-轨道-桥梁动力相互作用；振动特性中图分类号：U234；U443.22 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.2025.08.027

Abstract：Therearealargenumberofultra-largeslopebridgesintherackrailwayline，andthesetlementofbridgepiersisdifi culttoavoid.ItleadstothedecreaseofthesmoothnessoftherailwaylineandthreatenthesafetyandsmoothnessofthetrainTo solvethisproblem，basedonthetheoryofvehiclerack（track）-bridgedynamicinteractionandgeardynamics，acoupleddynamic modelofmountainvehiclerack（track）-bridge systemis established.Thedynamic modelconsidersthe nonlinear meshingbehavior ofgearrackandnonlinearcontactbehaviorofwheelrailindetail.Themeshingbehaviorofgearrackandthedynamiccharacteris ticsof vehiclesunderthreedifferentpiersettlementmodes（singlepiersettlement，continuouspiersettlemntandspaced pierset tlement）areinvestigatedndtheifluenceofdiferentpiersetlementmodesonthevibrationofvehicesisompared.Thersults showthatheinfluenceofpierselementontherackrailwaysysteismainlyreflectedintheverticalandlongitudialacceleration of thevehicle，and the main frequencyof vibrationis 1～2Hz and 8～9Hz respectively.The effects of single pier settlement on the basic vibrationcharacteristicsof therack-bridgesystemaresimilartothoseofdoublepiersetlement.Butcomparedwithdouble piersetlement，theectsofinglepiersetlementonthelongiudinalacelerationoftevicleaemoresignificant，ndtfluc tuationofthe meshingfrequencyisalsosignificantlyincreased.Piersetlementwillcausethe increaseof gearofset，andthenlead tothe instability of gear-rack meshing.When pier settlement is 6mm ，theproblem of meshing apartbegins to appear，which seriouslythreatensthe operation safety of vehicles.

Keywords：rackrailway；gearrackdynamics；piersettlement；vehicle-track-bridgedynamic interaction；vibrationcharacteristics

齿轨铁路具有卓越的爬坡能力，最大爬升坡度可达 480‰ 。（剩余16219字）