Vehicle / Track System Vertical Coupling Dynamics Finite Element Analysis

As we all known, FEM (Ftoite Element Method) has been developing very rapidly in thepast few decades. Convenient, fast, accurate and broadly suitable, it is being used more andmore extensively Combined with computer science, FEM has acquired an extrinary favorHowever the application in SCDOV/T (System Coupling Dynamics of Vehicle/Track) is still atits initial stage. It is true that the great advantages of FEM have been come into attention. butthey have not been brought into full play To break the limitation of the conventional multi-rigid system dynamics in modeling and calculation and to solve some difficult problems facedby traditional methods, in this paper, I try to solve such problems as Vertical coupling vibrationof Locomotive & Vehicle/Track with the help of FEM and to introduce the advancedtechniques of FEM more extensively and deeply into SCDOV/T.Whee/Rail relationship, actually a space contact problem, is crucial in studying therelatonship between vehicle and track system. The advancedness and effectiveness of the PQP(Parametric Quadratic Programming) in solving space contac problem are amply proved inpracical engineering applications. In this paper a detailed 3D entity Finite Element model isestablished, by means of PQP, the elastic/plastoelastic contac calculations of Wheel/Railsystem are worked out and the relations in between the Wheeel/Rail normal equivalent contactstiffness, the contact forces and the contact point positions are generalized.Based on the 3D FE model of Vehicle/Track whole system which composed of space beamelements, rod elements, etc., and by use of the elastic/plastoelastic calculating results ofWheel/Rail system, the vertical coupling vibrations of Vehicle/Track whole system are studiedunder a several of track boularities and exciting forees such as, the single harmonicirregularity the continuous harmonic irregularity and the rail joint, etc. The vibrationequations are solved with PCMOTA (Precise Computation Method of Transient Analysis)developed by Prof Zhong Wanxie in Dalian University of Technology PCMOTA has manymerits, for example, the choice of time step has nothing to do with the natural frequencies ofstructure vibration, the stability is unconditional and the calculation precision is comparable tothe computor precision.The infrastructure of rail plays a very important role in the Vehicle/Track system. Thesituations of deformation and force distribution among track infratructure have significantinfluence on the running safety and stationarity of train and on the service life of the track. Toge a trUe inteffiction relationship in bdeeen all componentS, a detailed 3D five-body cohactFE model is PrOPOsed in this W and the defOnnation and strCss distribution of traCkstrUctUre is researchd deeplyThere are various indications that the FEM and itS advanced tecboques to SCDOVrrresearch are not only feasible bu also incomparable in itS adVantages over the otherconventional methods. It is opcted to aPply FEM on railway dynamics successfully and tOgOt it exensive Prospect si~canhyPh.D. Candidatof Quan YUy'UnSuMisorf PrOf Zhan Feishengbof wu cnan...