Performance of end-capped multi-segmented conical tubes filled with foam under axial and oblique loads as an energy absorber

Rezvani, Mohammad Javad; Souzangarzadeh, Hamidreza

doi:10.1007/s40430-023-04581-4

J Braz. Soc. Mech. Sci. Eng.

2024

DOI: 10.1007/s40430-023-04581-4

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Performance of end-capped multi-segmented conical tubes filled with foam under axial and oblique loads as an energy absorber

Mohammad Javad Rezvani,

Hamidreza Souzangarzadeh

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Cited by 3 publications

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Energy-absorbing performance of multi-segmented conical tubes with different connections

Zhao,

Lin,

Chen

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part D:

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Thin-walled tubes are widely used in vehicle engineering due to their exceptional energy absorption capabilities. This study presents a series of multi-segment tapered tubes (MSTs) characterized by varying connection angles and segment counts. The MSTs are designed by establishing different connection angles (α) between adjacent tapered segments. A finite element (FE) model was developed to simulate axial impact loading, which was subsequently validated using the simplified super-folded element (SSFE) theory. The crashworthiness of MSTs with varying connection angles was analyzed. The following conclusions were drawn: (1) When α exceeds 10°, an increase in α leads to a gradual decline in the energy absorption efficiency of the MSTs, resulting in a “descending” load-displacement curve; (2) MSTs with α less than 0° exhibit a greater tendency to buckle under load and demonstrate a more rapid response to external forces; (3) Compared to corrugated straight tubes, the configuration featuring α = −30° and +30°, consisting of three segments and a cone angle of 7.5° (designated as MST3-7.5), significantly enhances specific energy absorption (SEA) and reduces the initial peak crushing force (IPCF).

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Energy-absorbing performance of multi-segmented conical tubes with different connections

Zhao,

Lin,

Chen

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

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Dynamic characteristics analysis of shock absorber based on fluid simulation

Li,

Yang

2024

Vib. proced.

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Pneumatic spring dampers are extensively utilized within hydraulic systems, and the flow characteristics of the internal oil play a crucial role in determining noise and vibration levels. To validate the mechanical structure's reliability, the shock absorber was simplified and the fluid domain was extracted using a CFD method. The velocity field and pressure field under different conditions were then simulated and analyzed. A finite element model of the flow field was established, and its accuracy was verified by comparing simulation results of gas side pressure with experimental results. According to the working principle of the oil-gas spring, dynamic active surfaces in contact with the main piston and dynamic driven surfaces in contact with the floating piston were defined, determining moving conditions for dynamic grids. The results indicate that as the diameter of flow channels increases, there is a decrease in average pressure drop within the oil chamber (i.e., pressure loss within the flow field). Additionally, as bend angle increases, average pressure drop decreases. However, optimization effects become less significant beyond a certain bend angle.

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Dynamic performance of compound vibration damping device for sport fitness equipment

Liu,

Sun,

2024

Vib. proced.

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Composite vibration damping is a crucial aspect in enhancing the performance of shock absorber, with potential for significant application in multi-degree-of-freedom sports facilities. Based on the finite element method, the modal analysis, harmonic response analysis and stiffness analysis of metal rubber shock absorber were realized, and the parameters of natural frequency, acceleration transmissibility and average stiffness were verified. Through ABAQUS, the finite element model of shock absorber was established and reasonably simplified, and the influence of wire diameter and relative density on the comprehensive performance was studied under the condition of prestress modal analysis. The results indicate that the shock absorber with a relative density of 0.35 exhibits higher average stiffness, but lower energy dissipation coefficient. Additionally, it shows larger peak values for natural frequency and acceleration transmissibility, but reduced damping. The simulation findings are in line with the experimental results, demonstrating the accurate acquisition of nonlinear mechanics and dynamic response properties of metal rubber shock absorber.

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Performance of end-capped multi-segmented conical tubes filled with foam under axial and oblique loads as an energy absorber

Cited by 3 publications

References 56 publications

Energy-absorbing performance of multi-segmented conical tubes with different connections

Energy-absorbing performance of multi-segmented conical tubes with different connections

Dynamic characteristics analysis of shock absorber based on fluid simulation

Dynamic performance of compound vibration damping device for sport fitness equipment

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