Study On Dynamic Performance And Control Of Airport Rapid Transit Straddle Monorail Vehicle Through Small Curve

Chongqing Jiangbei International Airport adopts straddle-type monorail system for the first time in the world.The airport rapid transit system has full-line tunnel access,minimum curve radius of 50 meters,full-line track and turnout without elevation,and 24-hour uninterrupted high-intensity operation.The track curve radius is small and the operating conditions are extremely complex.In order to ensure the safety of vehicles in extremely complex conditions,it is necessary to explore and carry out the research on the dynamic performance and control of the small curve of straddle monorail vehicles in airport rapid transit.Taking Jiangbei International Airport rapid transit monorail vehicles as the research object,this thesis establishes a linear air spring model and a nonlinear air spring model considering additional air chamber,height control valve and differential pressure valve,and designs an air spring suspension semi-active controller based on ceiling damping control strategy.Through the co-simulation method,the semi-active control of rapid transit monorail vehicles is studied based on the nonlinear air spring model.The main research content of this thesis is as follows:(1)Research on dynamic performance of rapid transit monorail vehicles based on linear air spring model.The structural characteristics of rapid transit monorail vehicle are analyzed,and a multi-rigid body dynamics model of rapid transit monorail vehicle with38 degrees of freedom is established and a simulation model of the whole vehicle is built based on ADAMS software.It was found that there is a problem of excessive radial force of the guide wheel when the vehicle passes through small curves.(2)Establish nonlinear suspension dynamics model.Using fluid mechanics and thermodynamics to analyze the working principle of air spring suspension,,and deriving the vertical mechanical models of air spring body,additional air chamber,height control valve and differential pressure valve.A nonlinear air spring suspension dynamics model including each subsystem is established by SIMULINK to lay the foundation for the subsequent research on the semi-active control of nonlinear air spring model when the rapid transit monorail vehicles pass through small curves.(3)Research on semi-active controller with canopy damping control strategy as the core.The characteristics of semi-active control strategies such as ceiling damping control and optimal control are compared and analyzed.Based on the principle of ceiling damping semi-active control,a semi-active controller of air spring of rapid transit monorail vehicle is established.The control effect of ceiling damping semi-active controller is verified by ADAMS-SIMULINK co-simulation.(4)Research on dynamic performance of rapid transit monorail vehicle with semiactive control of nonlinear air spring suspension.Through ADAMS-SIMULINK cosimulation platform,a simulation model of rapid Transit monorail vehicle based on semiactive control of air spring suspension was established.The dynamic performance analysis was carried out combined with evaluation criteria,and the comparative analysis of dynamic performance of rapid transit monorail vehicle before and after control was carried out to verify the effect and feasibility of ceiling damping semi-active controller.The results show that the designed semi-active controller can control the dynamic performance of the monorail vehicle through the small curve effectively,which provides a reference value for the semi-active control of the air spring of rapid transit monorail vehicle...