Design And Dynamics Simulation Analysis Of Suspended Monorail Bogie With Wheel Motor

As the city continues to prosper,the structure of the city becomes more and more compact,and traffic congestion on the ground is severe.In order to solve the problem of large and medium-capacity transportation systems that are single and expensive.more and more cities are favoring suspended monorail transportation systems.A suspended monorail bogie driven independently by the wheel-side motors was designed in this paper.The bogie did not need the complicated transmission system,and had higher transmission efficiency,lighter weight and simpler structure.Overall parameters of the bogie were determined firstly,which were based on the technical parameters of the existing suspended monorail bogies at home and abroad.It was modeled by the three-dimensional modeling software Cero4.0,and the structural characteristics and force transmission process of the bogie were analyzed.Then refer to the basic resistance formula provided by CRRC Ziyang Locomotive Co.,Ltd.and corrected its quadratic coefficient.And the basic resistance formula was used to calculate driving torque,the basic resistance and additional resistance under different speeds,curve radii.The dynamic equations and the topological diagram of the whole vehicle were established under reasonable simplification of the vehicle structure.And the dynamic simulation model of the vehicle was established in Simpack software.According to GB5599-2019 and the bogie structure characteristics,the evaluation standards of running quality,running stability and curve passing performance were established.Then,the working principle,advantages and disadvantages of mechanical differential and electronic differential were compared and analyzed.The dynamic equation of the bogie in the curved section was established according to the analysis of the force of the bogie in the curved section.A torque distribution strategy aimed at improving the radial force distribution of the front and rear guide wheels was proposed and the boundary conditions of the maximum output torque of the motor and the maximum slip rate of the running wheel were also proposed.According to the analysis and calculation of vehicle dynamics,the following conclusions were obtained:1.The Sperling stability index of the suspension vehicle wheel-side motor bogie designed in this paper reached level 1 in the straight section,and the average maximum vibration acceleration reached the excellent level.2.In the curve section,the wheel load reduction rate,the maximum vertical force of the running wheel,and the roll angle of the car body generally decreased with the increase of the radius of the curve,and the deviation angle of the running wheel increased with the increase of the radius of the curve,then tending to be smooth.The radial force of each guide wheel varied with the curve radius.The wheel slip rate was positive,and there was no large slip of the wheel.All indicators had not exceeded the limit,and the curve passing performance was good;3.The torque distribution strategy proposed in this paper significantly improved the radial force distribution of the front and rear guide wheels,increasing the wheel tread to the curve passing performance of the bogie had been improved as a whole,and the more the motor can optimize the force difference between the front and rear guide wheels within the adjustable torque.The wheelbase of the bogie should not be too long or too short.And the torque distribution strategy was also applicable under crosswind conditions...