A shock resistance optimization design method for multi-stage energy absorption of rail trains

Abstract

The invention discloses an impact-resistance optimization design method of multilevel energy absorption of a railroad train. A one-dimensional longitudinal flexible dynamic model which can accuratelyreflects critical responses of the railroad train in a crash process is established, and mainly consists of a coupler contact end part unit, a rigid connection unit, a coupler spring element and a train body rod element. Main technology of the method includes longitudinal load-deformation feature extraction of a single-section train body, global optimization method-based reverse calculation of mechanical properties of stiffness and damping parameters of the simplified nonlinear train body rod element, establishment of a one-dimensional longitudinal flexible dynamic model of a whole-array formation and train energy absorption system parameter optimization process building. The method increases an accuracy rate of the one-dimensional simplified model on predicting train formation dynamic-response information, also greatly saves single-analysis machine time, solves the problem that synchronous optimization of energy absorption parameters of whole-formation trains is always limited by too-long consumed single-analysis time in the past, and can be used for crash energy system design and parameter optimization of a train design stage.

Description

technical field [0001] The invention relates to an impact-resistant optimization design method for multi-stage energy absorption of rail vehicles, which is especially used for parameter design and optimization of energy configuration schemes of rail vehicles in the initial design stage, and can perform synchronous real-time optimization of energy absorption parameters of the entire train. Background technique [0002] Over the past ten years, the passive safety of rail vehicles in China has received sufficient attention and development. The scope of research involves the configuration of train energy management systems, new concepts of energy dissipation, the development of new energy-absorbing structural components, and the analysis of crashworthiness of single-section car bodies. On the one hand, there are many studies on the development of energy-absorbing components and single-vehicle analysis, but relatively insufficient research on the energy configuration of the entire...

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Problems solved by technology

At present, the finite element model of the integrated train is widely used to analyze the collision response of the train under the specified calculation conditions, and the data obtained is abundant. However, due to the limitation of the computer hardware level, the single solution of the model takes a long time, and it is difficult to directly combine it with the optimization method. To optimize the energy absorption parameters of the train, but the current one-dimensional longitudinal dynamic model based on the mass-spring model cannot better approach the results of the finite element analysis, which shows that the longitudinal rigid shock is significant, and the response propagation is faster than the actual model

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