Multi-Objective Optimization Study for the Turnout Sub-Rail Parameters Based on Orthogonal Experiment

ABSTRACT

The stiffness and damping characteristics under the turnout rail are important factors affecting vehicle safety and stable running. According to the variable cross-section structure of a single 60 kg/m turnout No.18, a multi-body dynamic model of the vehicle-turnout coupled system is established. Based on the orthogonal test method, 25 group working conditions have been designed with the combination of the sub-rail stiffness and damping parameters. It has been found that the stiffness parameters under the rail have a greater impact on the vehicle’s performance through the range analysis of the simulation results. The vertical sub-rail stiffness mainly influences the vehicle’s vertical response and Sperling indicator. The lateral stiffness affects the derailment coefficient and the riding comfort. The matching scheme of the sub-rail stiffness and damping parameters is deduced by aiming towards the optimal vehicle security, stability and comfort, which provides a reference for the sub-rail structure design.

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