Optimal Analysis of the Hysteretic Characteristic Curve for Draft Gear Based on Response Surface Method

In order to truly reflect the work state of the draft gear and optimize the hysteretic characteristic curve for draft gear,it is proposed that the Longitudinal Train Dynamics(LTD) should be the most powerful tool for the analysis and simulation of the draft gear model.In the aspect of numerical optimization technique,according to the basal principle of Response Surface Method(RSM),the adjustment method for the size of RSM successive subregions is built,and the quadratic response surface model with constrains is solved by Genetic Algorithms(GA),which adopts surrogate constraint handling method and penalizing factor.Computational condition of the optimization is the Daqin railway line,the heavy haul connected trains and the danger running case.Based on numerical model of draft gear,the optimal model of its hysteretic characteristic cure is provided. Then an attempt has been made to optimize the optimal model using RSM based on GA.The results demonstrate that the optimal method is efficient and effective in solving the optimal design problem of hysteretic characteristic curve of draft gear.