Optimization Research On Coupler System Based On Train Collision Simulation

Coupler is the most basic connection part in the train, which has the function oftraction and buffer. Coupler buffer and crushing tube are the main components forenergy absorption. In low speed collision, energy absorption of the coupler system hasimportant effects on safety of train.Currently, there is less research on the interaction between energy absorption of thecoupler and the crashworthiness of train. With explicit finite element technology, thethesis research on the train the collision process of coupler system, to improve thesafety performance of the train effectively by the coupler system of the appropriateconfiguration. Specific contents are as follows:1. The theory of finite element method, the dynamic finite element theory and theimplicit and explicit algorithm are described in detail. Then introduce the use ofLsdyna software, contact algorithm and the hourglass control simply.2. Based on the working principle of the coupler system, the simplified model ofthe train couplers are constructed, the finite element analysis model of the train rigidbody model to simplify the coupling model and the train of15km/h to brake andvehicle movement train crash simulation analysis, the section of the vehicle speedcurve is obtained, coupler of crushing capacity curve and coupler force curve,evaluate the safety of the train. Compare the data with coupler company data forfurther optimization analysis.3. Optimization model of the train is established with maximization the minimumvalue of remaining coupler crushing distance as the optimization goal of train safety.Optimize the coupler crushing force in the condition of collision between15km/hmoving train and braking train by the means of surrogate model. Then conductmulti-objective optimization in different conditions of former impact and collisionbetween20km/h moving train and Static train for an appropriate direction to couplersystem configuration. Through the analysis of the principle of coupler system, the simplified finiteelement model simulation of train collision was established, the reliability of themodel was verified by comparing the simulation results with the coupler companydata. Under two different working conditions, the minimum value of remainingcrushing distance was maximized through optimization methods, the optimizationprocess and optimization results were analyzed. The research results in this paperprovide a proper improvement scheme for the coupler system configuration.