关键词: 地铁车辆, 轮径差, 钢轨波磨, 动力学性能, 熵权逼近理想解排序法

Abstract: The difference in wheel diameter has a significant impact on the running performance of metro vehicles, and the presence of rail corrugation makes the wheel-rail contact characteristics and metro vehicle dynamic performance increasingly complex. Based on the measured data of a certain Type B metro vehicle, a vehicle-track coupled dynamics model was established. A rail corrugation with a wavelength of 100 mm and a wave depth of 0.03 mm and five types of wheel diameter differences were set to study the variation laws of wheel-rail lateral force, wheel-rail vertical force, derailment coefficient, wheel load reduction rate, wear index, and wheel-rail creep force when the wheel diameter difference varies within the range of -1 mm to 1 mm under four curve conditions with radii of 300, 400, 500, and 600 m. The dynamic performance indicators were compared with those under the standard rail profile condition. A multi-objective optimization model was established using the entropy weight Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method to analyze the optimal wheel diameter difference corresponding to different curve radii in the presence of rail corrugation.Research has found that: when the wheel diameter difference is the same, the maximum wheel-rail vertical force, maximum derailment coefficient, wheel load reduction rate, wear index, and maximum lateral creep force all decrease with the increase of the curve radius, while the maximum wheel-rail lateral force shows a gradual increase on the left wheel and a gradual decrease on the right wheel. When the curve radius is the same and the wheel diameter difference varies between -1 mm and 1 mm, the maximum wheel-rail lateral force and maximum wheel-rail vertical force of the left and right wheels, the derailment coefficients of the left and right wheels, the wear indices of the left and right wheels, and the wheel load reduction rate all increase, while the maximum longitudinal creep force and maximum lateral creep force of the left and right wheels gradually decrease. Compared with rails without corrugation, the variation laws of the dynamic indicators of metro vehicles under rail corrugation are the same, but the magnitude of change is greater. The optimal wheel diameter difference range corresponding to the 300 m curve is -0.5 mm to 0 mm, while the optimal wheel diameter difference range corresponding to the 400, 500, and 600 m curves is -1 mm to 0 mm, and the optimal wheel diameter difference for all four curve radii is -0.5 mm.

Key words: subway vehicles, wheel diameter difference, rail corrugation, dynamic performance, entropy weight Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method