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

Liu, Yanwen; Yang, Bing; Xiao, Shoune; Zhu, Tao; Yang, Guangwu; Xiu, Ruixian

doi:10.1177/09544097211008283

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…In Ref. [33], the accuracy of the one-dimensional train collision dynamics model has been verified by comparing the simulation results with the energy absorbing devices' test results and the three-dimensional train collision FE model's simulation results including the compression stroke of each collision interface, the train collision energy conversion and the vehicles' velocity versus time curves. Wheel-rail contact 1.…”

Section: Model Validationmentioning

confidence: 99%

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

Yang

Xiao

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.

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Section: Model Validationmentioning

confidence: 99%

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

Yang

Xiao

Zhu

et al. 2022

Chin. J. Mech. Eng.

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“…e draft gear has only the functions of connecting and energy absorption. Based on previous research results, simplified longitudinal collision dynamics model, the following assumptions were made [12,42]:…”

Section: Model Assumptionsmentioning

confidence: 99%

Research on Calculation Method for Maximum Mean Acceleration in Longitudinal Train Collision

Zhang

Wang

Zhu

et al. 2021

Shock and Vibration

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A large number of numerical simulations are required to design an energy absorption scheme for train crashworthiness, leading to low design efficiency in the early stage. Based on train collision dynamics theory and the finite element method, a dynamic finite element model of longitudinal train collision is established. According to the model, we studied the acceleration time-history characteristics during the train collision process, obtained the mean-peak ratio coefficient, and determined the calculation formula for the maximum mean acceleration of a longitudinal train collision. Through characteristic analysis of the vehicle acceleration, interface force, and other parameters during a longitudinal train collision, the calculation method of the mean acceleration was improved. The analysis shows that the maximum mean acceleration depends on two stages in the collision process: (1) the coupler action of the head vehicle: the mean-peak ratio coefficient of the head vehicle is 0.7 in this stage, and the mean-peak ratio coefficient of other vehicles is 0.43; (2) the coupler of the collision interface is cut off, and the energy absorption devices of the head vehicle or intermediate vehicle absorb energy; the mean-peak ratio coefficient of the vehicle is 0.93 in this stage. On this basis, a mathematical function is established describing the mean acceleration of the vehicle and the average crushing force of the coupler collapse tube and the energy-absorbing device. The calculation formula is obtained for the maximum mean acceleration of the longitudinal train collision, and the results are compared with the mean acceleration obtained by numerical simulation. The Kruskal–Wallis ANOVA multisample independent nonparametric test was conducted to verify the reliability of the calculation results in the 95% confidence interval. The calculation formula can be used to calculate the maximum mean acceleration in the energy allocation stage of train crashworthiness design to effectively improve the efficiency of train collision energy allocation.

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弹性波传播对列车撞击动力学特性影响研究

Li,

Gong,

et al. 2023

J. Cent. South Univ.

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

Cited by 8 publications

References 27 publications

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

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

Research on Calculation Method for Maximum Mean Acceleration in Longitudinal Train Collision

弹性波传播对列车撞击动力学特性影响研究

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