Research on the optimal matching and dynamics performance impact of subway vehicles rail cant coupling wheel out-of-round
Aiming at the focuses on the impact of wheel out-of-round on the profile changes of the wheel surface,a dynamic model for subway vehicles-rail was established using SIMP ACK software.Involveing nine different rail cant settings and two different wheel out-of-round conditions,and including analysis of linear and four different radius curves,the influence of rail cant coupling wheel out-of-round on dynamics performance of subway vehicles was analyzed.Evaluation metrics include wheel-rail vertical force,wheel-rail lateral force,derailment coefficient,wheel load reduction rate,wheel-rail displacement,and wear index.Based on entropy weight method,a multi-objective optimization model was established to evaluate the linear riding smoothness and curve passing ability of the vehicle,and to obtain the optimal matching scheme between rail cant and wheel out-of-round.The study indi-cates that when there is wheel out-of-round,the impact of rail cant changes on lateral smoothness is greater than that on vertical smoothness.The existence of wheel out-of-round will increase the impact of rail cant on wheel-rail vertical force,wheel-rail lateral force,wheel load reduction rate.For linear and curved sections,the optimal rail cant for external or internal rail varies depends on the type of curvature radius.Specifically,the optimal rail cant for the R300,R400,R500 and R600 m is(1/40,1/30),(1/20,1/30),(1/40,1/30),(1/30,1/30)and(1/30,1/30),respectively.When there is no wheel out-of-round,the optimal rail cant for external or internal rail is(1/40,1/30),(1/30,1/40),(1/30,1/30),(1/30,1/30),and(1/40,1/30)respectively.This study provides technical support for wheel maintenance and repair for operational line design.
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