Research Of The Suspension System Based On The Dual Position Loop Feedback

Suspension control is the key technology of the maglev train research. The single position loop control system based on the gap feedback has some aspects to improve. The dissertation concentrate on the dual position feedback control in maglev suspension applaction, Adopting the way of analysis in theory togethered with the simulation experiment. The main contents are as follows:Firstly, the mathematical modal of the suspension system is built. And based on this, some kind of feedback in common use is analyzed and the cascade control method used abroadly is introduced.Secondly, based on the idea of the complementary filters, the modal of the single-electrical magnetic suspension control system using the dual position feedback, the design of the filters and the closed-loop stability and so on are discussed. The dual position feedback and the single position feedback control schemes are discussed in the way of the response to the given signal, the ability to restrain the disturbance from the track, the performance of reducing the influence of the load changes and so on. The influence due to changes of high pass filter and the low pass filter's parameters are analyzed from the system's stability angle.Then, the principle of the dual position feedback control is used in the dual velocity loop and the suspension control system based on the dual velocity feedback is discussed in detail. This control scheme is compared with the single velocity system in the way of considering the random disturbance of the roadway and when the train running on the transition curve as well as considering the elasticity of the track and so on. The characteristic between the two methods of frequency weight sum and the algebra sum are compared.Finally, the hardware of a digital controller is designed with DSP as the calculating core and FPGA as logical core. The program of the system is developed based on the inner interrupt function of the DSP. single magnet and bogie suspension experiments have been carried out. Also two kinds of control algorithms effect has been compared. The experiments confirmed that the analysis in theory is correct.