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In this paper, the effect of strip spacing on the aerodynamic performance of a high-speed pantograph with a double-strip is numerically studied using a shear stress transport turbulence model. Seve...

This paper studies the influence of lateral and local rail deformation on the train–track interaction dynamics in high-speed railways. While the traditional method ignores the curvature of a latera...

Plenty of studies focused on single-direction active suspensions on railway vehicles; at least four actuators per vehicle are needed forconventional active secondary suspensions in both lateral and...

A complete track-vehicle-pantograph-catenary (TVPC) coupling dynamics model is presented and several elaborate simulation cases are set to analyse the effect of vehicle body vibration on the pantog...

The transmission system of a motor car directly affects the operating reliability and running safety of a high-speed train. This study examines the coupled torsion vibration responses of a transmis...

Railway vehicle dampers undergo degradation and failure after long-term service. Bench tests in this paper indicate a stochastic failure process, in which damping characteristics follow bimodal ran...

A three-dimensional, vehicle–track coupled dynamics model has been developed that accurately reflects the dynamic performance of a high-speed train during operation. The model includes novel elemen...

A three-dimensional vehicle-track coupled dynamics model, with the inclusion of the axle-box bearings, has been developed, which considers the coupling effects between the bearing and the vehicle c...

A new fully parametric model revealing the nonlinear displacement-dependent characteristics of a high-speed rail pantograph damper has been developed in this study. In the multi-disciplinar...

This paper describes an impact detection system using strain signals based on fibre optic sensors(FBG) for the real-time monitoring of the catenary system. The proposed detection system consists of...

The rail is modelled as a simply supported beam in the vehicle–track coupled dynamics. The beam is formulated by a partial differential equation that is transformed into an ordinary differential equation by the method of mode superposition for numerical calculation. However, the size of the matrix that is formed by the mode-superposition method increases significantly with track length, which limits the calculation efficiency. Some methods have been developed to solve this calculation issue, but they diminish the merits of the vehicle–track coupled dynamics, which would systematically investigate the dynamics of a vehicle and a track from the entire vehicle–track system. A new method is developed to resolve this contradiction. First, a theory based on a sliding window is established to improve the computational stability with respect to the length and the window-movement ratio. Then, two methods, namely finite element method analysis and an analytical solution, are used to verify the accuracy of t...

TPL-PCRUN is a software program for the dynamic interaction simulation of pantograph–catenary systems. In the benchmark, based on the finite element method, the catenary model was built and the pantograph was considered as a three-level spring–damper–mass system. Then, through the contact definition between pantograph and catenary, the coupled model of the pantograph and catenary system was established. The respective dynamic equations of motions were solved by the time integration method. Thus, the simulation results were obtained and submitted for the comparison with the other software. On the other hand, a standard model from EN50318 was established and analysed by TPL-PCRUN. The simulation results by TPL-PCRUN were remarkably consistent with the reference values given by EN50318. It was proved that the results by TPL-PCRUN can be reliable. Recently, the software has been updated and improved. Some new models and algorithms are proposed, including the rigid–flexible hybrid pantograph model, contact def...

This paper studies the relationship between various coupled systems that can affect train operation, including interactions between track and train, the pantograph–catenary system and train, power supply system and train, and airflow and train, with respect to the structure and characteristic of a high-speed railway. With the increasing speed and aggravated dynamic behaviours of trains, the necessity for a study of the system dynamics of high-speed trains, considering all these interactions, is discussed. The overall simulation, optimisation and control are achieved based on the analysis of the dynamics generated by coupled systems in high-speed trains, and a theoretical framework for the dynamics is presented in the paper.

In this article, the static stresses in a catenary and its vibration modes are calculated by establishing the FEM model of the catenary with Euler–Bernoulli beam elements. The mode shapes of the catenary obtained are considered as the generalized variables which are used in the establishment of the motion equations of the catenary system. The physical model of the pantograph is simplified as a multi-body system with mass, stiffness, damping, and friction. On the basis of having derived the coupled motion equations of the pantograph–catenary system, its dynamic behavior is analyzed in detail and the contact force is calculated. Using the contact force as the external moving load of the FEM model of the catenary, the dynamic stress in the catenary is simulated. Through the detailed analysis and calculation, we not only obtain the dynamic stress response at any element of the catenary, but also its frequency responses. As the dynamic stress in the assistant wire is quite large, the influence of its structure...

The process of model set-up for the full system (the catenary system, the pantograph system and the overlap span) is described in detail. Especially, the nonlinear element of the dropper (may be slacken) is drawn out and is considered independently. Its dynamic force is exerted on the catenary wire and the contact wire separately. By the interface of the software ANSYS and Visual C++, the initial tension of each dropper is carried out for any appointed sag. On the basis of this, the static curve of the catenary wire and the contact wire is figured out and the final length of the dropper is obtained accordingly to offer effective guidance for the workers on the spot. Adjusting the original model of the pantograph system, the problem of the overlap span is solved. At last, by using a hybrid method, FEM and mode superposition technique, the degrees of the full system is reduced greatly and the computational speed increases. The result of the simulation is fit for the actual phenomenon. Thus, the method of this paper is valid.

Summary In order to examine the static and dynamic behavior of the pantograph-catenary system, a special teat facility is established and described in this paper. Since the catenary is difficult to be modeled by a hardware teat facility indoor, a mixed theoretical-experimental technique is introduced, in which the pantograph is an actual one but the catenary is just an input of a mathematical model. Bayed on setting up the hybrid simulation teat device of the pantograph-catenary system, the dynamic behavior of the system under overhead equipment with variant parameters is analyzed for different speed. The effect of the presag and the surface irregularities of contact wire on current-collection has been studied.

First in this paper, the nonlinear stability for a high speed railway passenger car is investigated theoretically and experimentally. Numerical methods are used to evaluate the Hopf bifurcation point and limit cycles of the vehicle system. And full scale roller rig test is carried out for the validation of the theoretical analysis. Then the H∞ robustness control theory is applied to design an actively controlled secondary lateral suspension. The controller is designed according to a simple car body-bogie frame model. Numerical computation shows that the use of active secondary suspension can not only ensure the hunting stability, but also improve the dynamic responses of the high speed passenger car. An attempt is made to realize active control for the secondary lateral suspension forces and to carry out test validation on roller rig.

This paper presents a systematic approach for robust performance analysis of active suspension system. Firstly, the background information on H - μ control methods is briefly described. Secondly, the formula of the structured uncertainties of active suspension are given, and the difference between the maximum singular values and structured singular values of a transfer function matrix is discussed. Then the robust performance of an active suspension system in the presence of assumed parameter variation is analyzed. All the steps are illustrated by means of a numerical example of a railway car with lateral active suspension system.

The International Association for Vehicle System Dynamics (IAVSD) symposium is the pre-eminent international conference dealing with ground vehicle dynamics and is organised under the auspices of t...