Abstract: The installation tolerance of reaction plate on a linear induction motor(LIM) metro track is a key parameter having a great influence on the interaction of the LIM rotor hanging from the bogies and the reaction plate(RP) on the track slab, based on the coupling vehicle-track system dynamic theory, a new model of vehicle-track coupling dynamic system considering the LIM behavior is developed to investigate the influence mentioned above. In this model, the vehicle subsystem is treated as a rigid multi-body system, considering a carbody, two bogies, four wheelsets and two LIM, which are connected with equivalent linear spring-damp systems. The track subsystem is considered as an elastic structure, consisting of rails, slab and the RP, the link between rails and slabs, slabs and RP is also treated as equivalent linear spring-damp system. Using this dynamics model the effect of the installment tolerance of the RP on the gap and interaction of the LIM rotor and the RP are analyzed, in which the track irregularities are simultaneously considered. The analyzed dynamical behavior includes the dynamic wheel-rail forces, derailment coefficient and the instant gap variation.

Key words: Air gap of the motor, Coupling vehicle-track dynamics model, Installation tolerance, Linear induction motor(LIM), Reaction plate(RP)