Study On Dynamics And Wear Of Low And Medium Speed Maglev Current Reception System

Compared with the traditional wheel-track rail transit,the low and medium speed maglev(LMSM)transit possesses the superiority of low noise,small turning radius,strong climbing ability,stable operation together with small area occupation,etc.In the development mode of urban rail transit in China,the LMSM as a new system has attracted much attention.As an important component of LMSM,the shoe-gear and contact track(SGCT)system is used to transmit the electric energy required by the train operation.At present,the operating speed of LMSM train is about 100 km/h,and there is a need to increase the speed.The SGCT system is one of the restricting factors for the speed increasing and the research on it is relatively weak,meanwhile,it also faces the problem of fast wear of the shoe-gear.Therefore,it is necessary to study the wear and dynamics of the SGCT system.The main contents of this thesis are as follows:(1)Three kinds of current reception system in rail transit are introduced in this thesis.Then three wear prediction models of rail transit are introduced.On this basis,a wear prediction model for LMSM train is deduced to calculate the wear of current collector shoe-gear and the factors influencing the wear are determined: contact pressure,contact resistance,friction coefficient,etc.(2)Based on the structure and characteristics of the maglev vehicle with six levitation frames,the dynamic model is established by the multibody dynamic software.Through simulation,the dynamic responses of the installation position of the current collector are obtained under the speed conditions of 100 km/h-200 km/h.(3)According to the structure and characteristics of current reception system in LMSM,multibody dynamic software is used to establish SGCT system dynamic model,the dynamic responses of the installation position of the current collector are imported into the SGCT system dynamic model.Finally,the dynamic responses of the contact force-velocity between the SGCT are calculated.Through the analysis of the results,the contact force to guarantee the stability of the current reception under different speed conditions is obtained which is helpful for the wear analysis of the shoe-gear.(4)On the basis of the contact resistance model of pantograph-catenary system,the contact resistance model of SGCT system in LMSM is deduced,and then the contact resistance is calculated.Finally,the wear of the shoe-gear under different contact forces and speed conditions is calculated by substituting the contact force,contact resistance and friction coefficient into the wear model of SGCT.Based on the above research,a reasonable initial value of contact pressure is set according to the relation diagram of velocity-contact pressure-wear,which can not only reduce the wear of the shoe-gear of the current collector,but also promote the speed increase of the LMSM.