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NONLINEAR OSCILLATIONS AND CHAOS IN A RAILWAY VEHICLE SYSTEM

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Chinese Journal of Mechanical Engineering 1998年第3期11卷 68-75页

作者： zeng jing national traction power laboratory, southwest jiaotong university southwest jiaotong Univ Chengdu China

The study of nonlinear oscillations and chaos of a railway freight car is undertaken. The vehicle is considered as a multiple rigid body system with 9 degrees of freedom. The vehicle forward speed is taken as the control parameter of the system. Hopf bifurcation point, limit cycles, quasiperiodic and chaotic motions of the system are computed by use of numerical methods. The identification of periodic, quasiperiodic and chaotic motions of the system is carried out by using the methods of phase plane portrait and Poincare map. Numerical results show that chaotic motion appears via the route of quasiperiodicity when the vehicle runs over a certain speed.

关键词： Railway vehicle Vibration Bifurcation Chaos

ELASTIC-PLASTIC FINITE ELEMENT ANALYSIS OF THREE-DIMENSIONAL CONTACT-IMPACT AT RAIL JOINT

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Chinese Journal of Mechanical Engineering 2003年第4期16卷 411-416页

作者： Wen ZefengJin XuesongZhang Weihuanational traction power laboratory,southwest jiaotong university,chengdu 610031, china southwest jiaotong university National Traction Power Laboratory Chengdu 610031

Using the finite element code ANSYS/LS-DYNA, a dynamic finite element modelwith an elastic-linear-kinematic-hardening plastic material is established to analyzeelastic-plastic stresses in the railhead in the impact process of wheel and rail occurring at thegap of rail joint. The model is based on the discrete elastic support condition of the rails, whichis suitable for the actual situation of wheel/track rolling contact. In the analysis the influencesof axle load, yield stress and tangent modulus of rail material on the stresses and strains areinvestigated in detail. The distribution of stresses and strains in the jointed railhead are *** is found that the axle load, yield stress and tangent modulus of rail material greatly affect thestresses and strains in the railhead during impacting. The study provides a reliable method anduseful datum for the further research on fatigue and wear of railhead and improving the rail jointmode.

关键词： Wheel/rail Rail joint Elastic-plastic Contact-impact Finite elementmethod

NUMERICAL ANALYSIS OF NONLINEAR STABILITY FOR RAILWAY PASSENGER CARS

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Chinese Journal of Mechanical Engineering 2001年第2期14卷 97-101页

作者： zeng jing national traction power laboratory, southwest jiaotong university 西南交通大学牵引动力国家重点实验室四川成都

The Newton Raphson iteration and QR algorithm are combined to search the Hpf bifurcation point of the vehicle running on straight track and on large radius curved tracks. Limit cycles that are bifurcated from the equilibrium points and the saddle node bifurcation point are computed through employing a variable step Runge Kutta method and the Poincaré map. Finally, numerical simulations are carried out for the stability of a high speed passenger car operating on straight and large radius curved tracks. The influences of the radius of curvature and the superelevation of the track on the stability of the vehicle system are investigated.

关键词： Railway passenger car Stability Bifurcation Limit cycle Critical speed

SUPER-ELASTIC CONSTITUTIVE MODEL CONSIDERING PLASTICITY AND ITS FINITE ELEMENT IMPLEMENTATION

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Acta Mechanica Solida Sinica 2010年第2期23卷 95-105页

作者： Qianhua Kan Guozheng Kang 1 Linmao Qian(State Key laboratory of traction power,southwest jiaotong university,chengdu 610031,china) [a] State Key laboratory of traction power Southwest Jiaotong University Chengdu 610031 China

Based on the experimental results of super-elastic NiTi alloy, a three-dimensional super-elastic constitutive model including both of stress-induced martensite transformation and plasticity is constructed in a framework of general inelasticity. In the proposed model, transformation hardening, reverse transformation of stress-induced martensite, elastic mismatch between the austenite and martensite phases, and temperature-dependence of transformation stress and elastic modulus of each phase are considered. The plastic yielding of martensite occurred under high stress is addressed by a bilinear isotropic hardening rule. Drucker-Prager-typed transformation surfaces are employed to describe the asymmetric behavior of NiTi alloy in tension and compression. The prediction capability of the proposed model is verified by comparing the simulated results with the correspondent experimental ones. Based on backward Euler＇s integration, a new expression of consistent tangent modulus is derived. The proposed model is then implemented into a finite element package ABAQUS by user-subroutine UMAT. Finally, the validity of such implementation was verified by some numerical samples.

关键词： NiTi alloy super-elasticity plasticity finite element implementation

Design of a 400 N and 12 mm Mechanical Air Gap High Temperature Superconducting Linear Synchronous Motor

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稀有金属材料与工程 2011年第S3期40卷 319-321页

作者： Yen Fei1,2,3, Li jing1,2,3, Zheng Shijun1,2,3, Jiang Donghui1,2,3, liu Lu1,2,3, liu Wei1,2,3, Ma Guangtong1,2,3, Wang Jiasu1,3, Wang Suyu1,3 1 Applied Superconductivity laboratory, southwest jiaotong university, chengdu 610031, china 2 State Key laboratory of traction power, southwest jiaotong university, chengdu 610031, china 3 national laboratory for Rail Transit, chengdu 610031, china SW jiaotong Univ Appl Superconduct Lab Chengdu 610031 Peoples R China SW jiaotong Univ State Key Lab Tract Power Chengdu 610031 Peoples R China Natl Lab Rail Transit Chengdu 610031 Peoples R China

The static thrust output on a superconducting coated conductor coil at different excitation and alternating current suspended above a three phase alternating current long-stator comprised of copper coils is presented. Excitation current up to 45 A was applied through the superconducting coil acting as the excitation system of the superconducting linear synchronous motor (SLSM), alternating current up to 9 A was applied to the armature and magnetic air gaps of 10 and 15 mm were investigated for four different cases; coreless, with an iron core or yoke and both a core and yoke. By scaling up and converting the studied superconducting single pancake racetrack coil into a double pancake coil and connecting four of such coils in series, an SLSM prototype capable of generating 400 N of thrust output and 1 kW of power output with a 12 mm mechanical air gap operating at 77 K is proposed.

关键词： high temperature superconductivity linear synchronous motor long stator motor superconducting coil force measurements

Theoretical　and　Experimental　Study　of　Hopf　Bifurcation　and　Limit　Cycles　of　Railway　Vehicle　Hunting

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Journal of Modern Transportation 1996年第2期13卷 21-28页

作者： zeng jing Zhang Weihua Shen Zhiyun national traction power laboratory,southwest jiaotong university,chengdu 610031,china national traction power laboratory Southwest Jiaotong University Chengdu 610031 China

The nonlinear hunting stability of railway vehicles is studied theoretically and experimentally in this *** Hopf bifurcation point is determined through c... 详细信息

The nonlinear hunting stability of railway vehicles is studied theoretically and experimentally in this *** Hopf bifurcation point is determined through calculating the eigenvalues of the system linearization equations incorporating with the golden cut *** bifurcated limit cycles are computed by use of the shooting method to solve the boundary value problem of the system differential *** validation to the numerical results is carricd out by utilizing the full scale roller test rig.

关键词： railway vehicle stability Hopf bifurcation limit cycle roller rig

Analyses of Creepages and Their Sensitivities for a Single Wheelset Moving on a Tangent Track

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Journal of Modern Transportation 1996年第2期13卷 29-37页

作者： Jin Xuesong Zhang Weihua national traction power laboratory,southwest jiaotong university,chengdu 610031,china national traction power laboratory Southwest Jiaotong University Chengdu 610031 China

Creep forces depend greatly on creepages in the contact area forming between wheel and *** creepages are completely determined by the state of a ... 详细信息

Creep forces depend greatly on creepages in the contact area forming between wheel and *** creepages are completely determined by the state of a wheelset moving on a *** this paper the contact state of a single rigid wheelset moving on a tangent rigid rail,creepages and their sensitivities to some parameters of contact geometry are analyzed by semi analytical method and numerical method,*** important ideas will be provided for the studies done on the interactions between wheels and rails at high speed.

关键词： creepage sensitivity wheel/rail contact

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具有主动悬挂的高速客车动力学性能研究

西南交通大学学报 1997年第2期32卷 193-197页

作者：徐涛西南交通大学牵引动力国家重点实验室

以具有二系横向主动控制悬挂装置的高速客车为例，建立了具有３１个自由度的整车数学模型。通过对系统主动悬挂简单数学模型最优控制的研究，给出了其控制规律，并用于高速客车的主动控制悬挂装置。通过对高速客车的运动稳定性、曲线通... 详细信息

以具有二系横向主动控制悬挂装置的高速客车为例，建立了具有３１个自由度的整车数学模型。通过对系统主动悬挂简单数学模型最优控制的研究，给出了其控制规律，并用于高速客车的主动控制悬挂装置。通过对高速客车的运动稳定性、曲线通过性能、随机响应的动力学仿真分析表明，加装该二系横向主动控制装置不仅能提高高速客车的蛇行临界速度，而且能较大地改善高速客车的横向运行平稳性；高速客车曲线通过性能如脱轨系数、轮轨横向力均有降低，其曲线通过性能得到了改善。因此。

关键词：高速客车主动悬挂计算机仿真动力学

Effects of Lateral Motion on the Creep Forces in Wheel/Rail Rolling Contact

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Journal of Modern Transportation 1997年第1期14卷 45-55页

作者： Jin Xuesong Zhang Weihua Hu liujia national traction power laboratory, southwest jiaotong university, chengdu 610031, china

The influences of the lateral motion of a single wheelset running on a tangent railway on the creepages and creep forces between wheel and rail are investigated with numerical methods. The effect of the yaw motion of wheelset is neglected in the analysis, and Kalker’s theory of three dimensional elastic bodies in rolling contact is employed to analyze the creep forces in the wheel/rail rolling contact with Non Hertzian form.

关键词： lateral motion wheel/rail rolling contact creepage creep force