Parameter Optimization and Sensitivity Analysis of Track Structures for Superconducting EDS Ultra-High-Speed Maglev Systems on Bridges

Existing studies have mainly focused on vehicle suspension control and coupled analysis of normal conducting maglev systems, while research on parameter optimization and sensitivity analysis of guideway girders for superconducting electrodynamic suspension (EDS) maglev systems on bridges remains limited. In this study, a coupled mechanical simulation model of the maglev vehicle, guideway, and bridge is developed. Considering vertical train loads, temperature rise of trackside coils, and high-speed operating conditions, the displacement, stress, dynamic amplification factor, vehicle vibration response, and levitation gap variation of the guideway girder are analyzed. The results show that increasing the girder height can improve the first-order vertical natural frequency of the structure and reduce the dynamic amplification effect. A girder height of 3.0–3.2 m provides relatively stable dynamic responses at 600 km/h. Under the structural form and calculation conditions considered in this study, a span of 24 m shows favorable dynamic response and engineering applicability. The concrete elastic modulus of the guideway girder is a key parameter affecting the system dynamic response. The levitation gap variation is sensitive to car body mass, and the air spring stiffness should be optimized by balancing vibration reduction performance and gap stability. The results can provide a reference for structural design and parameter optimization of guideway girders for superconducting EDS maglev systems on bridges.