Design and injury analysis of the seated occupant protection posture in train collision

Yang, Wendi; Xie, Suchao; Li, Haihong; Chen, Zengtao

doi:10.1016/j.ssci.2019.04.028

Cited by 24 publications

(9 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimal values of the neck injury predictor and the weighted injury criterion were obtained by identifying the balance between

and WIC in the optimization so that each body part was only slightly injured. The comprehensive optimal point was found when the criterion of minimizing the sum of the distances from the two Pareto response values to the optimal point to the corresponding minimum values in the solution set was the least, according to the principle of distance minimization ( Yang et al, 2019 ). The calculation formula is as follows:

where n = 2 denotes the number of optimization goals, i.e., the two WIC and

optimization objectives;

is the response value of the i th optimization objective at the k th Pareto response point.…”

Section: Multi-objective Optimization Of the Pre-tensioned Force-limi...mentioning

confidence: 99%

Optimization of the driver’s seat belt and injury biomechanical analysis in real-world minivan small offset impact accident scenarios

Yang

Shi²,

Fu³

et al. 2022

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

To minimize injuries and protect the safety of the driver in minivan small offset collisions, an optimized pre-tensioned force-limiting seat belt was proposed herein. An accident with detailed information, such as medical reports, vehicle inspection reports, and accident scene photographs, was reconstructed using HyperMesh software. The effectiveness of both the accident model and the pre-tensioned force-limiting seat belt was evaluated. To obtain the optimal seat belt parameters for driver protection, first, force-limiting A, pre-tensioned force B, and pre-tensioned time C factors were selected in designing an orthogonal test with different factor levels. The influence laws of each factor on the injury biomechanical characteristics of the driver were analyzed via the direct analysis method. Moreover, each kind of critical injury value of the human body was synthesized, and the radial basis function surrogate model was constructed. The three seat belt parameters were optimized using the NSGA-II multi-objective genetic algorithm. The results showed that the optimal balance variable parameter of the seat belt was 4751.618 N–2451.839 N–17.554 ms (A–B–C). Finally, the optimal scheme was verified in a system simulating a minivan small offset collision. The results showed that after optimization, the skull von Mises stress was reduced by 36.9%, and the stress of the cervical vertebra cortical bone and cancellous bone decreased by 29.1% and 30.8%, respectively. In addition, the strains of the ribs and lungs decreased by 31.2% and 30.7%, respectively.

show abstract

“…The optimal values of the neck injury predictor and the weighted injury criterion were obtained by identifying the balance between

where n = 2 denotes the number of optimization goals, i.e., the two WIC and

optimization objectives;

is the response value of the i th optimization objective at the k th Pareto response point.…”

Section: Multi-objective Optimization Of the Pre-tensioned Force-limi...mentioning

confidence: 99%

Optimization of the driver’s seat belt and injury biomechanical analysis in real-world minivan small offset impact accident scenarios

Yang

Shi²,

Fu³

et al. 2022

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…The research conducted in different fields can be summarized as follows. At a global level, the collision response and energy management of the marshaling train have been studied, including the energyabsorption structure distribution and energy-absorbing order optimization [19]; furthermore, cab and interior structure optimization, and occupant secondary collision damage assessments have been conducted [20][21][22][23][24]. At a local level, based on the maximum energy absorption guideline, special energy-absorption devices have been designed to optimize and improve the energy-absorbing performance [25][26][27][28][29][30].…”

Section: Introductionmentioning

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.

View full text Add to dashboard Cite

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.

show abstract

“…In general, after a primary collision, the effect of inertia causes interference between passengers and interior structure such as chairs, floors, and sidewalls, resulting in secondary collision injury. 3,4 Some studies [5][6][7] have attempted to improve crashworthiness by incorporating crash energy management (CEM) methodology in order to limit the deceleration imposed on passengers caused by a primary collision. Several studies [8][9][10] tried to reduce the initial peak crushing force of the energy absorption structure through optimization methods to lower the initial acceleration pulse.…”

Section: Introductionmentioning

confidence: 99%

Analysis of passenger’s injuries caused by sidewall impact during train-overturn derailments

Wang

Peng

et al. 2022

Proc Inst Mech Eng H

View full text Add to dashboard Cite

The contact between passenger and the vehicle interior especially sidewall in train overturn derailment accident cause extremely serious injuries to passenger. It is regrettable that there are few relevant studies that account for overturning accidents and passenger injuries. In this study, the impact responses subject to sidewall and passenger injuries during train-overturn derailments are investigated. First, a theoretical model and a practical accident are used to validate the overturning multi-body dynamic model of an 8-car Electric Multiple Unit (EMU) coupled with a passenger. And then, the passenger’s kinematic responses of baseline models with tray tables put back and put down are studied. The results of simulation cases with different train speeds (V), friction coefficients, chair distances (D), and passenger positions (P) show that V and D have a positive impact on passenger injuries. While the friction coefficient has an overall negative influence on the passenger’s injuries, there are some irregular fluctuations. Generally, the sitting position farther away from the sidewall tends to be more dangerous for passengers. And the tray table plays an important role in protecting passengers under the same conditions. This study provides referential value for the study of train overturning accidents and guidance for the protection of passengers.

show abstract

Design and injury analysis of the seated occupant protection posture in train collision

Cited by 24 publications

References 27 publications

Optimization of the driver’s seat belt and injury biomechanical analysis in real-world minivan small offset impact accident scenarios

Optimization of the driver’s seat belt and injury biomechanical analysis in real-world minivan small offset impact accident scenarios

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

Analysis of passenger’s injuries caused by sidewall impact during train-overturn derailments

Contact Info

Product

Resources

About