Analysis of the crashworthiness design and collision dynamics of a subway train

Abstract

In this study, the crashworthiness of a subway train was assessed by establishing a finite element model for the first three carriages of the train and the track using the Hypermesh software. By utilising the *MAT_HONEYCOMB material model, a honeycomb in an anti-climbing energy-absorbing device was simulated. Moreover, the process of a subway train – travelling at a speed of 25 km/h – colliding with another identical train in a stationary and non-braking state was simulated by employing the finite element analysis software Hypermesh and LS-DYNA. The process of simulation analysis was divided into two parts: (1) analysis of the anti-climbing energy-absorbing devices under static compression for the investigation of energy absorption and (2) collision analysis of the whole train. The contributions of the proposed energy-absorbing structure – at the end of driver’s cab, the coupler and draft gears on each section – to the overall energy absorption in a train collision were calculated. Furthermore, based on the EN15227 standard, the crashworthiness of the train with respect to the survival space for occupants, train acceleration and uplift of wheels relative to the track was evaluated. The coupler of the first carriage fails in a collision at 25 km/h, and the coupler and draft gear are the main energy-absorbing devices. *MAT_HONEYCOMB was used to define the honeycomb materials in anti-climbing energy-absorbing devices and could simulate the mechanical performance thereof. The crashworthiness of the train meets the relevant standard requirements.

Parameter study and multi-objective optimization for crashworthiness of a B-type metro train

“…It can meet the requirements for engineering design, and has been widely used in research on passive safety in train collisions. [4][5][6][7][8][9][10] In this study, a one-dimensional train collision multi-body dynamics model was established using "LS-DYNA" software, as shown in Figure 4(a). The vehicle models were simulated using hexahedral solid elements with material #MAT 20, and only the translational degree of freedom in trains moving direction were retained, and other degrees of freedom were constrained.…”

“…3 These simulation analyses often incorporate a finite element method and/or system dynamics method. Xie et al 4 set up a finite element model for the first three carriages of a subway train, and accessed the train's crashworthiness. Zhu et al 5 created a finite element model for a rigid barrier impacting a single vehicle, and proposed an energy absorption ratio for the vehicle body and its key components.…”

Study on Dynamic Damage of Crash Barrier under Impact Load of High-Speed Train

“…In the aspect of train collision, Li et al [8] found that the time to achieve collision avoidance is constrained by the timing of events, such as wireless communication latency, driver reaction, safety protection distance, and deceleration rate. Xie et al [9] used HyperMesh software to establish the finite element model of the first three carriages and tracks of a train to evaluate the crashworthiness of a subway train. The energy absorption research of an anti-climbing energy absorption device under static compression and the collision analysis of the whole train are carried out.…”