Study On Ground Continuous Monitoring System Of Wheel-rail Force For High-speed Railway

Ground monitoring system of wheel-rail force is great important for keeping high-speed trains safe.The existing technologies and equipments of wheel-rail force measurement based on resistance strain measuring are immature for continuous monitoring of wheel-rail force and difficult to fully adapt complicated electromagnetic environment of high-speed trains. Ground continuous monitoring technology of wheel-rail force for high-speed railway is eager to be researched and developed.This paper deeply analyzed existing ground monitoring technologies of wheel-rail force, proposed new ground continuous monitoring technology of wheel-rail force based on rail strain, carried out test verification and pre-researched monitoring system based on optical fiber. The main work and results are as follows:1) Established a virtual platform for the design and analysis of ground monitoring system of wheel-rail force by FEM analysis and virtual form strain gage bridges. The proposed platform systemically simulated the feedback of rails under various constrains and loading conditions. The extensive simulation results had verified the validity of the proposed platform. This work also creates a foundation for the measurement of wheel-rail force and the development of research in theory and related products based on the measurements of the rail strain and deformation.2) Proposed a scheme for the ground continuous measurement of wheel-rail force which is based on the rail strain in this paper. An algorithm for the continuous measurement of the linear status for the vertical force was proposed and this algorithm can be used to cope with the impact of sleeper constraints. Methods using additive flexural moment and the difference of general flexural moment were proposed to solve the effects of additive flexural moment. The scheme was verified through the simulations and the results showed that the proposed algorithms can fulfill the requirements of high accuracy, long term and continuous monitoring for wheel-rail force measurement. This part of work also creats a new orientation of basic theory research on ground continuous measurement of wheel-rail force. 3) Conducted the prophase work for the prototype development of FBG for continuous monitoring of wheel-rail force which aims to satisfy the demand of the rail side monitoring system of high-speed trains, proceeded the research on related technologies and applications, the basic fixture design and selection of FBG sensor and demodulation system in the prototype system were accomplished as well.