High Speed Scanning The Swept Force Under Rail-based Detection Of Position Dynamic Response Analysis And Experimental Research

In recent years, rail transport has become the main method for freight. However, overload and partial load of freight train cars not only bring down the fatigue and service life of track, but also be a key factor inducing railway traffic. Therefore, it is of great importance to timely detect the phenomenon of unbalanced loading of train cars, using unbalanced load monitoring technology for high-speed rail.To deeply study the influence between the front wheel and the back wheel, an experiment rig monitoring wheel-rail forces was designed. Three-dimensional wheel-rail finite element model was set up according to the real experiment rig, explicit dynamic analysis was made to find the relationship between strain and car speed in the detecting position. The validity of outcomes was demonstrated by comparing to the experimental results. These works perfected the research theory and system for wheel-rail force monitoring system. This paper will include the following research contents:(1). Current situation studies of home and abroad models of wheel-rail were made, the theory of dynamic finite element analysis was introduced, then the paper displayed the methods when using LS-DYNA and filter methods for results.(2). Wheel-rail finite element models were set up and then element types, material models, boundary conditions, initial conditions and controlling parameters were defined according to the real object. After that, strain responses of different positions under various speeds were obtained by using LS-DYNA.(3). Strain response discipline of current and adjacent cross-section was drawn by Matlab data processing of LS-PREPOST simulation data. Improvement scheme were brought forward after the comparison between simulation results and experimental results.