Study on the influence factors of impact ejection performance for flexible airbag

Li, Yu-Ru; Xiao, Shoune; Yang, Bing; Zhu, Tao; Yang, Guangwu

doi:10.1177/1687814018807333

Cited by 4 publications

(8 citation statements)

References 7 publications

(6 reference statements)

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“…In [6], the landing process is simulated using FEM in the LS-DYNA software package in order to further optimize it. The same package is used in works [7,8] whose authors compare the method of corpuscular particles with the method of volume control and study the effect of mass flow, compression, and the thickness of an airbag on its effectiveness. As already noted, such solutions are universal but inferior in accuracy to the spectral ones.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Spectral solution to a problem on the axisymmetric nonlinear deformation of a cylindrical membrane shell due to pressure and edges convergence

Myntiuk

2021

EEJET

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A geometrically and physically nonlinear model of a membrane cylindrical shell, which has been built and tested, describes the behavior of a airbag made of fabric material. Based on the geometrically accurate relations of "strain-displacement", it has been shown that the equilibrium equations of the shell, written in terms of Biot stresses, together with boundary conditions acquire a natural physical meaning and are the consequences of the principle of virtual work. The physical properties of the shell were described by Fung’s hyper-elastic biological material because its behavior is similar to that of textiles. For comparison, simpler hyper-elastic non-compressible Varga and Neo-Hookean materials, the zero-, first-, and second-order materials were also considered. The shell was loaded with internal pressure and convergence of edges. The approximate solution was constructed by an spectral method; the exponential convergence and high accuracy of the equilibrium equations inherent in this method have been demonstrated. Since the error does not exceed 1 % when keeping ten terms in the approximations of displacement functions, the solution can be considered almost accurate. Similar calculations were performed using a finite element method implemented in ANSYS WB in order to verify the results. Differences in determining the displacements have been shown to not exceed 0.2 %, stresses – 4 %. The study result has established that the use of Fung, Varga, Neo-Hookean materials, as well as a zero-order material, lead to similar values of displacements and stresses, from which displacements of shells from the materials of the first and second orders significantly differ. This finding makes it possible, instead of the Fung material whose setting requires a significant amount of experimental data, to use simpler ones – a zero-order material and the Varga material

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Spectral solution to a problem on the axisymmetric nonlinear deformation of a cylindrical membrane shell due to pressure and edges convergence

Myntiuk

2021

EEJET

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“…This method transforms the traditional work done by cylinders into work done by airbags to achieve ejection acceleration of the test rig [24]. Li et al [25] used the CV method to establish a finite element model for air spring ejection and obtained the influence of parameters such as gas mass flow and wall thickness on ejection performance through simulation analysis. To further study the impact of cord parameters on ejection performance, Xiao Shoune's team established a dynamic ejection model for air spring based on the surface fluid element method.…”

Section: Introductionmentioning

confidence: 99%

“…Through simulation analysis, they obtained the influence of cord parameters on ejection performance and static load characteristics. They also discovered the phenomenon of impact instability during the acceleration of the test rig in ejection impact tests [26]. The series/parallel combination of air spring can achieve long-distance and high-thrust ejection impact tests on rail vehicles and component-level elements.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Performance Prediction of Ejection Impact of Air Spring Based on Fluid–Structure Interaction

li,

Xiao,

Xie

et al. 2023

Preprint

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Air springs have found wide application in cushioning and shock absorption, but their use in ejection scenarios is still in its early stages. To address the challenges of applying air spring in high-speed ejections of rail vehicles, this study focuses on the ejection of the driver's cabin structure and investigates the elastic performance of air spring using a series-parallel combination. The study analyzes ejection characteristics for air spring in a series-parallel configuration by number simulation. A second-order response surface method is employed to establish a predictive model for the ejection performance of air spring in this configuration. The model's accuracy is verified through virtual collision analysis of the driver's cabin in a rail vehicle. The ejection velocity exhibits a relative error of only 9.1%. The test vehicle, driven by air spring, achieves a maximum kinetic energy of 415 kJ, meeting the initial target value of not less than 408 kJ. Additionally, the analysis of wheel-rail interaction reveals that the vertical lift and lateral displacement of the test vehicle are within acceptable limits, measuring 5.49 mm and 9.89 mm, respectively, without exceeding the wheel flange height and tread width. These results demonstrate that air spring with series-parallel combination can successfully propel the test vehicle to conduct driver's cabin collision tests, without any derailment or overturning. As a result, the study realizes ejection tests using air spring with series-parallel combination. The research on the ejection performance of air spring in this configuration offers a new driving and ejection method for applying air spring in rail vehicles, drones, and air-launched missiles, presenting promising prospects for future applications.

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“…Liu, Li, and Zhu [31][32][33] proposed an air spring impact test system for rail vehicle propulsion that utilizes air spring inflatable energy storage ejection work, leading to improved ejection acceleration, lower noise, and faster reaction times compared to traditional methods. The Xiao's team conducted a series of studies on the ejection performance of air springs, exploring the force characteristics under compressed gas using the CV method, as well as the impact of gas mass flow and air spring thickness on ejection performance [34]. The team also analyzed the load characteristics of air springs and investigated the influence of cord parameters on ejection performance and static load characteristics [35,36].…”

Section: Introductionmentioning

confidence: 99%

“…The Xiao's team conducted a series of studies on the ejection performance of air springs, exploring the force characteristics under compressed gas using the CV method, as well as the impact of gas mass flow and air spring thickness on ejection performance [34]. The team also analyzed the load characteristics of air springs and investigated the influence of cord parameters on ejection performance and static load characteristics [35,36].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Mechanical Characteristics of Air Springs Based on a Fluid–Solid Coupling Simulation Method

Li,

Xiao,

Xie

et al. 2023

Applied Sciences

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The use of air springs has become widespread in various industries due to their exceptional superelastic properties; however, their strong nonlinear characteristics have become a hindrance to numerical simulations of air springs and have garnered increasing attention. This paper examined the nonlinear dynamic mechanical characteristics of air springs from a fluid–structure interaction perspective and verified the accuracy of the simulation analysis model through quasistatic tension and compression experiments. The average relative errors for air spring load and gas pressure were found to be 8.1% and 7.7%, respectively, which supports the validity of the model. The impact of frequency and amplitude excitations on the axial load characteristics of air springs was investigated through tension and torsion testing. The results showed that increasing the excitation frequency improves the stability of the axial load, while increasing the excitation amplitude enhances the axial load value. The change in axial compression was found to be more significant than that in axial tension, as it was affected not only by the axial load but also by the radial load, which is a key factor affecting the dynamic characteristics of air springs. A radial load analysis model was established to study the influence of frequency and amplitude excitations on the axial load characteristics of air springs. The simulation results indicated that under different amplitudes, the radial load of air springs goes through four stages: a steady period, rising period, steady period, and falling period. Additionally, under the same amplitude, the radial load value increases with an increase in frequency. This research on the dynamic load characteristics of air springs under amplitude and frequency excitations is important for their application in low-frequency and low-amplitude vibration environments, and its findings can be utilized to improve the technical parameters of air springs for suspension damping.

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Study on the influence factors of impact ejection performance for flexible airbag

Cited by 4 publications

References 7 publications

Spectral solution to a problem on the axisymmetric nonlinear deformation of a cylindrical membrane shell due to pressure and edges convergence

Spectral solution to a problem on the axisymmetric nonlinear deformation of a cylindrical membrane shell due to pressure and edges convergence

Numerical Simulation and Performance Prediction of Ejection Impact of Air Spring Based on Fluid–Structure Interaction

Nonlinear Dynamic Mechanical Characteristics of Air Springs Based on a Fluid–Solid Coupling Simulation Method

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