Energy-absorption optimisation of locomotives and scaled equivalent model validation

Yao, Shuguang; Ke-fei, Yan; Lu, Sisi; Xu, Ping

doi:10.1080/13588265.2016.1276118

Cited by 20 publications

(10 citation statements)

References 8 publications

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“…Based on the similarity theory, a one-ninth-scale model of the train is established. 39 The mass of the scaled equivalent model is 135 kg, so the mass of the full-scale car is 98,415 kg, which is close to the mass of a locomotive. The plastic deformation platform force of a honeycomb material is stable, 40,41 and the loading curves of a crushing tube (energy absorber of vehicle) and a honeycomb are shown in Figure 13; thus, an aluminum honeycomb can be used to simulate the energy absorber of vehicle.…”

Section: Scaled Equivalent Model Testmentioning

confidence: 97%

Equivalence study involving rail vehicle collision test conditions

Yao

Ke-fei

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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In the context of rail vehicle collision tests, which incur high costs and consume substantial time and energy, the equivalence between a single vehicle crashing into a rigid wall and two identical vehicles colliding with each other was studied. Taking the car body as a rigid body, a three-dimensional multi-body dynamic model was built to simulate a single-vehicle impact and a collision between two identical vehicles; the results showed that the condition of a single vehicle crashing into a rigid wall at a speed of [Formula: see text] can be used to replace the condition of one vehicle moving at a speed of v and crashing into an identical vehicle that is stationary. However, the actual collision is a strong nonlinear process, and it is necessary to conduct the equivalent test of the condition of collision. Based on the similarity theory, the scaled equivalent vehicle model is established. Through a series of scaled model tests, the following conclusion is drawn: if one vehicle moving at a speed of vcrashes into another identical vehicle that is stationary, one can equivalently use a single vehicle with a speed of [Formula: see text] (units: m/s) that crashes into a rigid wall. This study provides practical support for the equivalence of vehicle collision test conditions and holds great value for engineering applications.

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Section: Scaled Equivalent Model Testmentioning

confidence: 97%

Equivalence study involving rail vehicle collision test conditions

Yao

Ke-fei

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…Previous studies have found that during a collision, the compression of the moving train is always greater than that of the stationary train; in addition, the first three interfaces of the moving train undergo the maximum EA. 5,29 Thus, during the test, three high-speed cameras were used to record the first three interfaces’ collisions of the moving cars. The centre of each of the first three cars in the moving train was equipped with a longitudinal acceleration sensor.…”

Section: Scaled Equivalent Model Collision Testmentioning

confidence: 99%

“…Related studies have shown that moving cars absorb slightly more energy than the stationary cars in both scaled test and simulations. 29 Therefore, statistics are generated only for the deformation of the moving car to obtain the EA of the subway vehicle head and middle cars. When the deformation of one middle car is the highest, its EA can meet the requirements of the other middle cars to absorb energy; thus, the deformation of the HC and the MDMC were considered.…”

Section: Statistics Of the Calculationmentioning

confidence: 99%

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Energy absorption design study of subway vehicles based on a scaled equivalent model test

Ke-fei

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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To obtain the characteristics of collision energy absorption and improve the passive safety of subway vehicles, the energy absorption design of subway vehicles was studied based on a one-seventh-scale model crash test. A full-size three-dimensional model of a subway vehicle was established using the multibody dynamics software MADYMO. The simulation results of the dynamics model were scaled down according to the similarity coefficients. By comparing the simulation results with the scaled model test results, the maximum error of deformation was 2.10 and 4.35% for the head car and the maximum deforming middle car, respectively, and the energy absorption error was found to be 8.75 and 5.70% for the head car and the maximum deforming middle car, respectively. The results indicate that the collision dynamics model of subway vehicles is relatively accurate. Next, based on this dynamics model, a full factorial experiment was designed to study the effects of the marshalling, mass and crushing tube’s plastic deformation platform force on the energy absorption of subway vehicles. The calculation results were fitted by multiple linear regression functions. Finally, the authors obtained the crash energy absorption formulas for the subway head car with an accuracy of 98.42% and for the maximum deforming middle car with an accuracy of 95.31%. These formulas can be applied to the preliminary design of subway vehicles and offer guiding significance for the parameter design of subway vehicles’ energy-absorbing devices.

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“…Research shows that the energy generated by a rail vehicle collision is extremely large; because the head car is located at the first impact interface, it has a higher demand than the other rail cars in terms of the energy-absorbing capability of the energy-absorbing device. 35–38 However, to reduce the aerodynamic drag, the cross-sectional area of the high-speed train is limited. A honeycomb energy-absorbing device should be designed in such a way that it is longer than the traditional energy-absorbing devices, which may lead to bending, destruction and uncontrollable deformation of the honeycomb; these factors are not conducive to energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a honeycomb energy-absorbing device for high-speed trains

Li¹,

Zhang²,

Ke-fei³

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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Aluminium honeycomb is a light weight, thin-walled material with a typical multi-cellular construction and a good strength-to-weight ratio. Therefore, aluminium honeycomb can be used as an energy-absorbing device for high-speed trains. Due to its large mass and high operating speed, a high-speed train can generate large impact energy. Thus, an energy-absorbing device with a greater energy absorption capability must be designed for high-speed trains. To reduce the aerodynamic drag, the cross-sectional area of a high-speed train is limited. Therefore, a honeycomb energy-absorbing device should be designed in such a way that it is longer than the traditional energy-absorbing devices; however, this may lead to bending, destruction and uncontrollable deformation of the honeycomb; these factors are not conducive for energy absorption. In this paper, a sleeve structure was designed for high-speed trains, and a crash experiment of the energy-absorbing structure showed that the bending and destruction of the honeycomb energy-absorbing device are effectively suppressed compared with the ordinary honeycomb energy-absorbing structure. Moreover, the fluctuation of the crash force was smaller and the crash force is more stable than the traditional thin-walled energy-absorbing structure. Therefore, the deformation instability problem of the ordinary honeycomb energy-absorbing structure and the crash force fluctuation problem of the traditional thin-walled energy-absorbing structure can be solved. Then, a crash experiment and simulation involving a high-speed train with improved honeycomb energy-absorbing device was carried out, and the results showed that the deformation of the end of the train body was stable and controllable, and the train body deceleration satisfied the collision standard EN15227.

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Energy-absorption optimisation of locomotives and scaled equivalent model validation

Cited by 20 publications

References 8 publications

Equivalence study involving rail vehicle collision test conditions

Equivalence study involving rail vehicle collision test conditions

Energy absorption design study of subway vehicles based on a scaled equivalent model test

Experimental study of a honeycomb energy-absorbing device for high-speed trains

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