High-speed Rail Vehicle Research Articles

Dynamic stability and curving performance of railway vehicles.

This paper presents hunting stability and curving performance of high speed rail vehicles. Considering non-linear creep force and flange contact, the lateral force of front wheel on outer rail was calculated in steady state curve negotiation, and critical speed of wheelset and truck hunting was also calculated. The influence of linkages which were so-called cross-anchor linkage, linkage between wheelset and truck frame, and secondary suspension which were bolster anchors and anti-yaw damper and primary anti-yaw damper were examined. These results were compared with our proposed analytical solutions of optimal design for stability and curving performance, and design of truck suspension was discussed. By studing the difference of analytical truck models, it was proved that it was possible to use half body model for testing on roller rig or truck model. Moreover calculation of hunting stability by using half body model was compared with results of test on roller rig, which was carried out in Railway Technical Research Institute with good agreement.

Dynamic Stability and Curving Performance of Railway Vehicles

This paper presents the hunting stability and curving performance of high speed rail vehicles. Considering non-linear creep force and flange contact, the lateral force of the leading wheel on outer rail is calculated in steady state curve negotiation. The critical speed of wheelset and the truck hunting are also calculated. The influences of the linkage which is so-called cross-anchor linkage, the linkage between wheelset and truck frame, and secondary suspensions which are composed of bolster anchors, anti-yaw damper and primary anti-yaw damper are examined. The results are compared with analytical solutions of an optimal design proposed by the authors for good stability and curving performance. Finally the design of truck suspension is discussed. By studying the difference among analytical vehicle models, it is proved that it is possible for analysis of hunting stability to use a truck model or a half body model. Moreover, the calculation results of hunting stability by using the half body model are compared to agree well with the test results of a vehicle conducted on roller rig in Railway Technical Research Institute of Japanese National Railways.

Three-dimensional dynamic interaction of ties : Sarfeld, W; Savidis, S A; Schuppe, R; Klapperich, H Proc 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15–19 June 1981V3, P287–292. Publ Rotterdam: A. A. Balkema, 1981

A model is presented for the calculation of high speed rail vehicles in which coupling of the ties bedded on the surface of a homogeneous elastic isotropic half space is taken into account. The three dimensional mixed boundary conditions in the region of the rigid ties are satisfied exactly. Numerical results are presented for rectangular concrete ties illustrated by amplitude curves, whereby the side length ratio and the number of the ties are varied. The results demonstrate the influence of coupling on vertical vibrations. Compliance functions for vertical coupling are presented which allow derivation of suitable frequency independent spring and damping coefficients. These compliance functions can be used for calculating the total system tie-rail-vehicle finite element. It is finally shown how these compliance functions can be easily calculated approximately.

An Active Suspension System Design for the Lateral Dynamics of a High-Speed Wheel-Rail System

Railroad cars are known to exhibit instabilities in the lateral dynamics at high speeds. To solve some of the problems of stability, an active suspension system is studied for the high-speed rail vehicle and is compared with the passive system. The vehicle control problem is formulated as an optimization problem with an integral quadratic cost function, and the feedback law thus obtained is further simplified. For the case of the truck dynamics, with external controllers, a Lyapunov function approach is taken for considering state constraints. Stability regions are obtained by analog computer simulation.