Mechanical Analysis And Kinematic Trajectory Optimization For Sliding Plug Door Of Rail Vehicle

In recent years,due to the rapid development of rail vehicle technology,sliding plug doors have become the preferred choice for modern rail train passenger compartment doors because of their high sealing,high safety,high thermal insulation and sound insulation performance.As sliding plug doors are more widely used,their problem of “difficulty in closing” has gradually emerged,especially in cities with large passenger flow,which often causes train delays and other consequences.This paper takes sliding plug door of rail vehicle as the research object,and studies the closing performance of sliding plug door through theoretical analysis,mechanical modeling,construction function and simulation verification.The specific research work is as follows:(1)The structural principle of sliding plug door of rail vehicle is analyzed,and the finite element model of sliding plug door system is established.Based on the calculation formula of equivalent elastic modulus and equivalent density of aluminum honeycomb composite material,the concrete parameters of the composite materials of the sliding plug door were determined,and the external load was applied to the door according to the standard.The static deformation and static stress of the door are obtained by finite element statics analysis.The analysis results show that the maximum deformation of the door structure is 7.73 mm and the maximum stress is 92.2MPa,both of which meet the requirements of domestic railway standards for side door system.Modal analysis results show that the fundamental frequency of the whole structure system is 12.8Hz.(2)The basic logic of sliding plug door closing motion control is explored,and the mechanical factors affecting the closing performance of sliding plug door during closing process are analyzed.The resistance model of each factor in sliding plug door closing process is established,and the total resistance model of closing motion is constructed.The condition model for successful closing of sliding plug door is obtained,and the specific factors affecting the closing performance of sliding plug door are determined.(3)The relevant parameters of train,vehicle and door are clarified.The effects of vehicle marshalling number,door installation number,train air conditioning air supply volume and door motion trajectory function on sliding plug door closing performance are analyzed and relevant conclusions are drawn.A method to improve the closing performance of sliding plug door by optimizing the design of sliding plug door motion trajectory curve is proposed.(4)The resistance difference of the existing sliding plug door closing motion is calculated by using mathematical software.According to the construction condition of sliding plug door motion trajectory function,the sliding plug door motion trajectory optimization function is established,and the parameters of the optimized trajectory function are determined.The resistance difference of the optimized trajectory function is calculated.The motion trajectory curves before and after optimization are simulated by kinematics simulation software respectively.The rationality and effectiveness of the optimization method proposed in this paper are verified by comparing the analysis results.