Guofeng Zeng

Turning over Investigation of Low-Speed Guideway Switch for High-Speed Maglev Transportation

In this paper, investigations on turning over of the first low-speed guideway switch for high-speed maglev transportation are introduced. Through geometric nonlinear analyses and comparisons for several characteristics during the turning over process of the switch, a schema with minimum position deviation, smooth changes of line types, gentle variations of stresses, and driving forces, is obtained. Based on the test and verification, the correctness of the theoretical analyses and the feasibility of the turning over schema are proven. The turning over schema has been applied to the low-speed guideway switch and obtained satisfied results.

Scheme Research on Transfer Table for Shanghai Maglev Line

With the development of urban rail transit, a trend of parking trains and maintenance vehicles separately has emerged. Because of its convenience and the relatively small area it occupies, transfer tables are typically utilized to transfer vehicles from one track to the other track in the maintenance base. In order to improve the maintenance function of the Shanghai Maglev Demonstration Line, exclusive parking tracks for maintenance vehicles, which are parallel to the existing ones, need to be added to the existing infrastructure. Transfer tables are typically characterized as running safely and steadily while maintenance vehicles ride atop the rail. As the vehicles transfer between different tracks, it ensures that maglev trains pass through it smoothly when located in the existing track. In this paper, the scheme of the transfer table is introduced.

New Technologies Make Maglev Guideway Safer and More Comfortable

This article describes the different types of the guideway inspecting technologies developed for the Shanghai maglev demonstration line. For safety and riding comfort, it is important -- during both construction and daily operations -- to inspect or measure the different deviations of the guideway regularly. However, it is impossible to do the job manually because of the short maintenance window time, the high accuracy requirement and the long distance. Therefore, the National Maglev Transportation Engineering R&D Center (NMTC) has developed a series of guideway inspection technologies and equipment -- like Automatic Inspection Equipment (AIE), Long-wave deviation Detection System (LDS), Stator Inspection Equipment (SIE), and Vehicle Vibration Evaluator (VVE) -- that are based on the system requirements of maglev and historical experience from operation and maintenance. With the help of these new technologies and equipment, maglev guideways will become safer and more comfortable in the future.

Dynamic Responses of Different Types of Guideway Structures on Shanghai Low-speed Maglev Test Line

The National Maglev Technology R&D Center (NMTC) has been doing research on low-speed maglev technologies since 2005. The Shanghai low-speed maglev test line was built in July 2006, with a total length of 2.0 kilometers. During the layout of the test line, situations that may arise in engineering practice were taken into account. For the guideway system, different types of structures for the main line and the vehicle maintenance line, of different spans, were produced and erected. From 2006 to 2010, numerous tests have been systematically conducted on the line, covering all sub-systems. According to experiences from the Shanghai high-speed maglev line, dynamic response of the guideway structure may have a great influence on the stable running of a maglev vehicle. During these tests, dynamic responses of different types of girders and track skeletons are recorded and analyzed, including accelerations, displacements and stresses. The responses of different parts of the guideway switch were also taken in order to make evaluations and find its weakness to guide further optimization. Through these analyses, some instructive suggestions for the design of guideway structures were acquired.