Round Sweep Force Monitoring Signal Effect Of The Analysis, The Track Support Stiffness

With the increase in freight train speed, the overload and unbalanced-load of the train becomes the major factor of the running accident that the freight train derailed and turned over. By the technology of overload and unbalanced-load measurement to detect overload and imbalanced load in time, take necessary measurements to avoid running accidents, which possesses much significance. To further study the overload and unbalanced-load measuring technology, a small-scale experimental platform for the high speed wheel-scan force detecting was designed and built. The thesis studied the affect of the wheel-scan force detecting signals when the support conditions under the rail changed. The wheel/track contact model under flexible support was established in finite element analysis software; By the orthogonal experimental design method, the Simulate combination was rationalized, and the dynamic simulation was done; Combined with experimental research, the correctness of this mathematical model was verified and it improved the initial integration of wheel-scan force detecting system.The main contents are detailed as following:(1) The track dynamic model in domestic and overseas was summarized. Directed towards the specificity of this study's content, the finite element method was used to model, and the arithmetic theory and process of the analysis problem by explicit dynamics finite element analysis procedure LS-DYNA was theoretically expatiated。(2) The finite element model of rail was established in the large finite element analysis software "ANSYS/LS-DYNA" by selecting of element type, material model and contact algorithm, etc. the explicit nonlinear dynamic finite element procedure "LS-DYNA" was used to solve and the dynamic simulation was carried out.(3) By the orthogonal experimental design method, the wheel load,brace stiffness and velocity was chose as variable factors, the strain value of the designated point on the rail as test indexes. After the simulation test, the simulation results were got by the post-processing software "LS-PREPOST". According to the working principle of the sensor, the strain output in the result curves was changed to the practical detecting voltage signals, and the impact of these three variable factors on the wheel-scan force detecting signals was summarized.(4) A set of equipments which can achieve different loaded weight through the rail detection area and change the brace stiffness under the rail was designed and manufactured and static experiment was executed. Compared the experimental datas with the simulation results, the similarities and differences were get and the reason was analyzed. The model's correctness was proved, which provide feasible research methods to next simulation.