Crushing analysis and multiobjective crashworthiness optimization of combined shrinking circular tubes under impact loading
| Autor: | Yao Yu, Weiyuan Guan, Guangjun Gao |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Control and Optimization
Materials science business.product_category 0211 other engineering and technologies Particle swarm optimization 02 engineering and technology Mechanics Radius Deformation (meteorology) Computer Graphics and Computer-Aided Design Multi-objective optimization Finite element method Computer Science Applications 020303 mechanical engineering & transports 0203 mechanical engineering Control and Systems Engineering Die (manufacturing) Crashworthiness Sensitivity (control systems) business Software 021106 design practice & management |
| Zdroj: | Structural and Multidisciplinary Optimization. 64:1649-1667 |
| ISSN: | 1615-1488 1615-147X |
| DOI: | 10.1007/s00158-021-02938-8 |
| Popis: | This paper proposes a new type of energy absorber with combined shrinking circular tubes for a high-speed train. An impact experiment is conducted to investigate the dynamic crushing performance of this energy absorber with combined shrinking circular tubes. The results show that the combined tubes experience steady dynamic shrinking deformation. Finite element (FE) models of the energy absorber are then developed, and the dynamic crushing forces are in good agreement with the impact test. A theoretical solution for the dynamic shrinking crushing load is derived. Based on the validated FE models, the effects of the friction coefficient, wall thickness and die radius on the dynamic crushing force and energy absorption are investigated. An increase in the wall thickness leads to a substantial growth in the maximum crushing force (Fmax) and specific energy absorption (SEA), but the growth rate of Fmax is much larger than that of the SEA as the wall thickness increases. In addition, comparing theoretical and FE results demonstrates that predictions of the dynamic steady-state forces for the combined shrinking circular tubes with different friction coefficients, wall thicknesses (t) and die radius (Rdie) are satisfactory. Finally, to improve the crashworthiness of the expanding circular tubes, Sobol’ sensitivity analysis is employed to analyze the effects of the design parameters (t and Rdie) on the objective responses (SEA and Fmax) using the Kriging model. A Pareto front of double optimization objective SEA and Fmax was obtained after being optimized by multiobjective particle swarm optimization (MOPSO). The results show that SEA and Fmax are positively correlated, and a balance between the SEA and Fmax was obtained at optimal point C (SEA = 13.09 kJ/kg, Fmax = 581.11 kN). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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