Simulation of the behavior of a railway vehicle with independently driven wheels

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Simulation of the behavior of a railway vehicle with independently driven wheels

Liang, B. / Iwnicki, S.D. / Swift, F.J.

It is well known that railway vehicles with conventional rigid wheelsets can experience problems of unstable running which in extreme circumstances may lead to derailment. Uncoupling the two wheels across each axle dramatically reduces the instability known as hunting but can lead to an impairment in the natural curving ability of the wheelset. However if wheels on the same axle are driven independently through a suitable control system, improved curving performance as well as good stability may be achieved. This paper presents an application of advanced control methods and simulation to the operation of independently rotating wheelsets for railway vehicles. Due to the nature of the application, the implementation of the control system needs to have a fast response. In this work we have investigated the use of modem vector control strategy to control the induction motors. The preliminary simulation results show that good stabilization can be achieved. A test implementation on a 1/5 scale roller rig is now being set up to validate the simulation results.