Research on Design Optimization of Levitation Controller Reliability for Medium-low Speed Maglev Vehicles

Abstract

Objective Levitation controller is a key component of the medium-low speed maglev vehicle, and its reliability directly affects the stability and reliability of the vehicle′s levitation system. Therefore, it is necessary to improve the reliability of the levitation controller. Method With a single levitation electromagnet containing two levitation controllers as the research object, through analyzing the reliability of the levitation controller, its reliability model is established, and a fault tree analysis is conducted to identify the key factors influencing the levitation controller. By transforming two levitation controllers in the single levitation electromagnet into one levitation controller, an optimization scheme for the levitation controller is proposed, together with the redundant design for some key components. Based on the circuit principle of the optimized levitation controller, a reliability model and a fault tree model for the optimized levitation controller are established, and comparison analysis is conducted on the reliability of the levitation controller before and after the optimization. Result & Conclusion Compared with the levitation controller before optimization when a single levitation electromagnet contains two levitation controllers, the total failure rate of which is 2.282×10-6 h-1, the rate of an optimized single levitation electromagnet levitation controller is 1.064×10-6 h-1, a decrease of 53.37%. The reliability of the optimized levitation controller is significantly higher than that of the original one.

Keywords

• urban rail transit
• medium-low speed maglev vehicle
• levitation controller
• reliability model
• fault tree analysis
• equipment failure rate