Dynamic Performance Optimization for Permanent Magnet Levitation Suspended Monorail Vehicle Bogies

ObjectiveImpact is generated when the permanent magnet levitation suspended monorail train passes through the finger plate area, significantly affecting the bogie dynamic performance and subsequently the passenger ride comfort. Therefore, it is necessary to study the critical technical bottleneck for the widespread application of this type of vehicles. MethodTaking the Honggui (red rail) Line developed by Jiangxi University of Science and Technology (which uses permanent magnet levitation suspended monorail vehicles) as the research object, the time-domain distribution of the lateral and vertical accelerations on the bogie at measuring point 1 is analyzed, when the train passes through the finger plate area at 40 km/h. Using the Simpack dynamics simulation software, a high-precision dynamic model of the permanent magnet levitation suspended monorail vehicle is established, with fully considering the complex characteristics of the non-linear magnetic forces in the permanent magnet levitation system. The input spectrum of the simulation model is calibrated combining with line test data. The guide wheel and stability wheel stiffness, and the height of the on-board magnet installation position relative to the bottom surface of the guideway beam, these two parameters’ influence on the bogie's impact acceleration and the lateral displacement of the magnets is specifically analyzed. A comprehensive optimization scheme combining "stiffness reduction + centering magnet position" is proposed. Result & Conclusion Reducing the stiffness of the guide wheels and stability wheels can effectively suppress the impact acceleration but may increase the lateral displacement of the magnets at the same time, further increasing the risk of rail suction. Centering the on-board magnets can suppress the bogie's rolling motion and reduce the lateral displacement amount of the magnets. The proposed comprehensive optimization scheme can not only reduce the bogie impact acceleration when passing through the finger plate area, but also effectively limit the lateral displacement amount of the magnets, preventing the rail suction.