| With its unique structural advantages,linear motor metro has been gradually popularized and applied worldwide.However,no matter how special its structure is,linear motor vehicles still need to operate on track system.Under the action of high load bearing and track irregularity,the wheel-rail interaction force is increasing and the operation quality is deteriorating.In order to improve this situation,a series of wheel-rail vibration reduction methods have been explored and applied,and the resilient wheel has achieved certain effects due to the use of rubber layer between the rim and the wheel core,which has the ability of vibration mitigation,therefore the resilient wheel has caused some research and attention.However,there are some problems when the resilient wheels are used to improve the quality of linear motor vehicles.Firstly,unlike traditional rotary motor vehicles,the driving of linear motor vehicles requires the joint action of the primary of LIM on the bogie and the secondary of LIM on the track plate.The resilient wheel not only changes the contact characteristics of the wheel-rail system,but also changes the electromagnetic coupling characteristics of the linear motor system,and the related research is very rare.On the other hand,the stiffness is the key parameter of the resilient wheel,which not only affects the dynamic performance of the vehicle but also is closely related to the safety of the vehicle.How to select the stiffness parameters matching the linear motor vehicle in the design and how to achieve the ideal stiffness parameters in production still need further exploration and research.Therefore,this thesis studies the dynamic characteristics and stiffness characteristics of resilient wheels of linear motor metro vehicles,the results of which can promote the popularization and application of resilient wheels in linear motor metro vehicles,and provide some guidance for the practical application of resilient wheels.The main work and conclusions of the thesis are as follows:(1)Based on the vehicle-track coupling dynamics theory,the vehicle-track coupling dynamics model of linear motor metro with resilient wheel and rigid wheel is established respectively,and the correctness of the model is verified by field test.(2)By using the dynamic model of linear motor metro vehicle,the dynamic performance of linear motor vehicle under resilient wheel and rigid wheel in straight section,curve section,corrugation section and welded joint section is compared and analyzed.The calculation results show that,in addition to the vertical stability index in straight section,the dynamic performance indexes of linear motor metro vehicle under resilient wheel are better than those of rigid wheel vehicle under various working conditions,especially for curve condition and welded joint condition,the improvement of dynamic performance is particularly obvious.(3)Based on the linear motor vehicle dynamics model,the effect of resilient wheel stiffness parameters on vehicle dynamics indexes is explored,and the optimal stiffness value of resilient wheel is given.Since then,in order to ensure that the wheel stiffness reaches the design value in production,the finite element model of resilient wheel is established for exploring the factors affecting the wheel stiffness and its variation law.The simulation results show that the structural parameters and friction coefficient of the rubber have a greater impact on the resilient wheel stiffness. |
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