Structural Design And Dynamics Simulation Research Of Single-Axle Bogie For Suspended Monorail Vehicle

Suspended monorail transit system is a new type of urban rail transit system with medium or low capacity.It has the characteristics of short construction period,small area and low cost.It is very suitable for the construction of small and medium-sized urban rail transit.Due to its unique structure,the single-axle bogie has good curve passing performance and can well adapt to the complex characteristics of urban roads.On the basis of studying the suspended monorail traffic system,in order to improve the dynamic performance of the suspended monorail vehicle,this thesis studies a single-axle bogie suitable for the suspended monorail vehicle.First,a suspended single-axle bogie with permanent magnet motor direct drive is designed,and 3D modeling is carried out with CATIA software.Then the force transmission of the suspended monorail vehicle and the single-axle bogie is carried out,the working principle of the single-axle bogie is studied,the models of the vehicle and the bogie are simplified,and the UM(Universal Mechanism)software is used to establish the dynamic simulation model of the suspended monorail vehicle.Refer to the standard document GB/T 5599-2019 "Specification for dynamic performance assessment and testing verification of rolling stock" to design the simulation conditions and dynamic performance evaluation standards of vehicles on straight lines and curved lines.Then,the dynamic performance simulation analysis of the suspended monorail vehicle is carried out to study the dynamic performance of the vehicle.Finally,the genetic algorithm NSGA-Ⅱ is used to optimize the suspension parameters of the bogie to further improve the dynamic performance of the vehicle.Use the TOPSIS method to evaluate the optimization results and get the best suspension parameter scheme.Use the optimized parameters to simulate the vehicle dynamics performance again,compare the performance data and the optimization calculation results before and after the optimization,and verify the correctness of the optimized parameters and research methods.Through research and analysis,the following conclusions are drawn:(1)Due to the unique single-axis structure of the single-axle bogie,it will inevitably be affected by the overturning moment to generate a nodding motion when transmitting the traction force or braking force around the wheel,and set the balance rod device to suppress the nodding motion and maintain the stability of the bogie;(2)The stability indicators of the suspended monorail vehicles designed in this thesis are all less than 2.5,and the straight-line running quality reaches the excellent level.The curve passing performance of the vehicle,such as the roll angle and the maximum bearing capacity of the wheels,all meet the safety indicators,and the curve passing state and guiding action mode of the bogie depend on the curve radius and running speed;(3)The suspension parameters of the single-axle bogie are optimized,and the Pareto solution set of the optimization results is obtained by calculation.Use the evaluation method to find the best suspension parameter results,and perform the vehicle dynamic performance simulation analysis again.Comparing the simulation results before and after the optimization,it is proved that the optimization of the suspension parameters of the single-axle bogie improves the dynamic performance of the suspended monorail vehicle,and also verifies the correctness of the optimization results and the optimization design method.