A Study On Steering Technology Of Bogie With Electricial Coupling Independently Rotating Wheel

Key technology, using the Independently Rotating Wheel (shorted as IRW) makes floor height of Light Rail Vehicles (short as LRVs) lower than 200mm to facilitate passengers up and down. The princple and technology of IRW currently become its research focus. Apllicating electrical coupling technology to replace mechanics has been a novel research direction of IRW steering technology. So this paper completes exploratory study as follows:Firstly, an overview of the development history for IRW steering techonolgy has been summed up. The comparison of driven motors suspension and coupling relation between IRWs has been expatiated. Steering technology of different types of 100% low floor LRVs has been deeply discussed.Secondly, for the wheel-rail steering mechanisms and technology, in the softwares Matlab, establishing solid wheelsets and IRWs in the numerical models, have been utilized to simulate the different performance in straight line or curving. Introducting the active control technology, the apllied features have been writed in the paper between solid wheelsets and IRWs. With feedback singal such as speed difference, lateral displacement and lateral displacement speed, the advantages and disadvantages of three kinds of feedback technology have been comparated and simulated.The results showed that speed difference as feedback signal is the simplest and convenient to control.Thirdly, for the two-axle bogie, four structure styles of bogie have been constructed to choose the wheelsets model, IRWs or solid wheelsets. At first, the theory of steady-state curve have been accepted to research the linear bogie model; then the appropriate vehicle numerical models have been used to simulate dynamic performance of four vehicles, in order to determine the best type of bogie. By qualitative research and numerical simulation two concluion was drawed:the new type bogie with IRWs in rear axle are the best one; asymmetric suspension program of primary vertical stiffness is better than the symmetries. Fourthly, study a novel electrical coupling wheelsets which adopt the "electrical axis" technology to IRWs.The method of equivalent circuit has been apllied to establish its mathematic models.A new concept called electrical axle coupling stiffness factor has been firstly proposed to assess the coupling capability.A testing measurement of electrical axle system has been set up with double motors. Synchronous capability, rotor current and stator current of the system was invested by the numerical caculation and experimental testing, and found out their disciplines are the same to each other.Finally, in order to carry out experimental study of the bogie with electrical coupling IRWs, above philosophy and important conclusions have been apllicated to design experimental bogie with electrical coupling IRWs in concept:front and rear axle can rotate around the hinge in the middle of combination bogie.The structure and control strategy of its active control system was also determined.