Stability Analysis and Field Test of High-Speed Maglev Vehicle-Guideway System

Track irregularities are a major excitation source in maglev transportation systems, and controlling these irregularities is key to ensuring long-term operational comfort. Variations in train speed alter the excitation frequency induced by track irregularities, often leading to amplified vibrations within specific speed ranges during variable- speed operation. This phenomenon negatively impacts ride comfort. This study conducted field tests on the stability of a high-speed maglev system. We investigate the vibration response characteristics of a high-speed maglev train during variable- speed operation and analyzed the stability trends of the system. A high-speed maglev vehicle-guideway coupled vibration model was developed based on parameters from the Shanghai Maglev Demonstration Line. The study investigated the dynamic behavior of key indicators, including carriage acceleration, suspension frame acceleration, and air gap, during acceleration phase, identifying the speed ranges in which vibration amplification occurs. Furthermore, the effects of key track irregularity parameters were examined by modifying the wavelength and amplitude of irregularities. The study identified the critical wavelengths that significantly influence dynamic responses under variable-speed conditions. Based on the findings, we propose the wavelength range and amplitude thresholds that should be closely monitored and controlled in acceleration zones. This research provides a theoretical basis for managing track irregularities in variable-speed sections and offers guidance for maintaining the long-term ride comfort of maglev transportation systems.