Field Test and Dynamic Characteristics Analysis of High-Speed Maglev Guideway Girder

Abstract

High-speed maglev, as the fastest transportation on the ground, may become the most promising long-distance transportation choice in the future. The dynamic characteristics of the girder, which is the main supporting member, is very important to the design and health monitoring of the maglev transportation system. This paper presents the field measurement and numerical analysis of the dynamic behavior of the guideway girders in Shanghai high-speed maglev test line. An output-only time-domain system identification method namely, the Natural Excitation Technique (NExT) coupled with the Eigensystem Realization Algorithm (ERA) was used in this study. The dynamic responses of the girders are presented and analyzed in both time and frequency domains. The results show that the NExT-ERA method can well predict the inherent dynamic properties of the girders.