Crashworthiness Analysis of the Structure of Metro Vehicles Constructed From Typical Materials and the Lumped Parameter Model of Frontal Impact

Proceedings of the Institution of Mechanical Engineers, Part F:

et al. 2021

Self Cite

A train’s crashworthiness responses are directly affected by the vehicle weight M, train collision speed V, and empty stroke D. This study investigated the influences of M, V, and D on train crashworthiness. A one-dimensional multi-body dynamics model for a B-type metro train was created and verified. Approximate models were established for the total compression displacement (TS) and overall average collision deceleration (TMA) based on M, V, and D, and a novel method was proposed for quickly predicting the output response of a train’s crashworthiness. The effects of the various parameters on TS and TMA were investigated, and a multi-objective optimization for minimizing TS and TMA was conducted. The results indicated that V has the greatest influence on TS and TMA, followed by M, and then D; M has a positive effect on TS and negative effect on TMA, whereas D has a negative effect on both TS and TMA; V has a positive effect on TS, but for TMA, the effect changes from positive to negative when V increases to 23 km/h. The optimized metro train has higher integrity in the passenger living space and a lower train collision average deceleration, and the crashworthiness is significantly improved.

Section: Dynamics Model Establishmentmentioning

confidence: 99%

Section: Surrogate Model Construction and Accuracy Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Liu

Yang

Proceedings of the Institution of Mechanical Engineers, Part F:

et al. 2021

Self Cite

“…1 However, train collisions are diverse and most existing standards are set for frontal collisions without any requirements for side collisions and collision scenarios between trains and other trackside buildings. 2,3 Current research on train collisions is primarily focused on the collision dynamics theory, [4][5][6][7][8] numerical collision simulation techniques, [9][10][11][12][13][14][15][16] collision energy management, [17][18][19][20] and tests. 21,22 In terms of train collision simulation modelling, compared with testing, multi-body dynamics theory and finite element numerical simulation have become commonly adopted methods for designing and verifying the crashworthiness of vehicle structures owing to their advantages of economy, convenience, operability, short cycle time, and repeatability.…”

Section: Introductionmentioning

confidence: 99%

Simulation method for train curve derailment collision and the effect of curve radius on collision response

Zhu

Proceedings of the Institution of Mechanical Engineers, Part F:

et al. 2023

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A method of collaborative simulation of the train collision process using a rigid motion model and a flexible collision model is proposed to solve the problem of the low computational efficiency of the finite element numerical simulation of the train collision process. This study investigated the collision response of a train derailment hitting a platform with different curve radii based on an accident in which a subway train derailed and hit a platform. Based on the results, a collision damage index is proposed to assess the relative degree of damage of train derailment collisions at different curve radii. The results reveal that within a certain radius of the curve (when the impact distance D exists), there is a positive correlation between the curve radius and the collision damage index, and when the curve radius exceeds a certain value (when the impact distance D doesn’t exist), the train and platform don’t collide.

“…Numerical simulation methods include the finite element method and the multi-body dynamics method [4]. Xie et al [12,13] investigated the collision responses of two colliding trains and vehicles impacting obstacles using the finite element method respectively. Compared with the finite element method, the multi-body dynamics method can significantly shorten the calculation time, and the calculation accuracy is within the acceptable range in engineering.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Multiple Parameters on the Responses of a B-type Subway Train

Yang

Zhu

et al. 2022

Chin. J. Mech. Eng.

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To obtain improved comprehensive crashworthiness criteria for a B-type subway train, the influence laws of the vehicle design collision weight M and empty stroke D on the train’s collision responses were investigated, and multi-objective optimization and decision-making were performed to minimize TS (total compression displacement along the moving train) and TAMA (the overall mean acceleration along the moving train). Firstly, a one-dimensional train collision dynamics model was established and verified by comparing with the results of the finite element model. Secondly, based on the dynamics model, the influence laws of M and D on the collision responses, such as the energy-absorbing devices’ displacements and absorbed energy, vehicles’ velocity and acceleration, TS, TAMA and the coupling correlation effect were investigated. Then, surrogate models for TS and TAMA were developed using the optimal Latin hypercube method (OLHD) and response surface method (RSM), and multi-objective optimization was conducted using the particle swarm optimization algorithm method (MPOSO). Finally, the entropy method was used to obtain the weight coefficients for TS and TAMA, and multi-objective decision-making was performed. The results indicate that D and M significantly affect the compression displacements and energy absorption of the first three collision interfaces, but have limited impact on the last three collision interfaces. The velocity versus time curves of vehicle M1 and M2 are shifted and parallel with different D. However, the velocity versus time curves of all the vehicles are shifted but gradually divergent with different M. The maximum collision instantaneous accelerations of the vehicles are directly determined by M, but are only slightly affected by D. Under the coupling effect, all concerned collision responses are strongly correlated with M; however, the responses are weakly correlated with D except for the compression displacement at the M2-M3 collision interface and the maximum collision instantaneous acceleration of vehicle M2. The comprehensive crashworthiness criteria of the B-type subway train were significantly improved after multi-objective optimization and decision-making. The research provides more theoretical and engineering application references for the subway train crashworthiness design.