Abstract
In order to find out the reason for the bogie frame instability alarm in the high-speed railway vehicle, the influence of wheel tread profile of the unstable vehicle was investigated. By means of wheel-rail contact analysis and dynamics simulation, the effect of tread wear on the bogie frame lateral stability was studied. The result indicates that the concave wear of tread is gradually aggravated with the increase of operation mileage; meanwhile the wheel-rail equivalent conicity also increases. For the rail which has not been grinded for a long time, the wear of gauge corner and wide-worn zone is relatively severe; the matching equivalent conicity is 0.31-0.4 between the worn rail and the concave-worn-tread wheel set. The equivalent conicity between the grinded rail and the concave-worn tread is below 0.25; the equivalent conicities are always below 0.1 between the reprofiled wheel set and various rails. The result of the line test indicates that the lateral acceleration of bogie frame corresponding to the worn wheel-rail can reach 8.5m/s2, and the acceleration after the grinding is reduced below 4.5m/s2. By dynamics simulation, it turns out that the unreasonable wheel-rail matching relationship is the major cause of the bogie frame lateral alarm. With the tread-concave wear being aggravated, the equivalent conicity of wheel-rail matching constantly increases, which leads to the bogie frame lateral instability and then the frame instability alarm.
Highlights
The instability of the railway vehicle means that the amplitude of a certain vibration type constantly increases with time when the vehicle is running at a high speed on a flat and straight track
Based on an existing linear creep model, Wickens [5] has researched the relationship between worn-wheel set creep and frame stability, as well as that between wheel-rail conicity and frame stability; the results have been verified by vehicle rolling test
The research of True H [7] has focused on the stability of railway vehicles; the use of nonlinear critical velocity has been proposed to evaluate the instability; the calculation method of nonlinear critical velocity has been summarized
Summary
The instability of the railway vehicle means that the amplitude of a certain vibration type constantly increases with time when the vehicle is running at a high speed on a flat and straight track. Based on the researches of True H et al, Ahmadian M [12] has studied the effect of parameters of antihunting motion damper and wheel-rail contact on the vehicle stability; the two-axis bogie has been taken as an example to analyze the creep force as well as the nonlinear wheel-rail contact characteristics; it has turned out that the nonlinear flange-rail contact could significantly increase the hunting motion of bogie. Park J H [13] has analyzed the lateral stability; the effect of vehicle suspension parameters and wheel-rail friction coefficient on the limit cycle has been studied and verified by rolling test. Piao M W [17] has proposed a vehicle-lateral-stabilityanalysis method which was based on wheel-rail matching and studied the antihunting damper constraint effect on the hunting oscillation of vehicle architecture frame. The analysis results are valuable for exploring the main cause of hollowed–wear tread in the future research
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