دانلود رایگان مقاله بهینه سازی لوله های بیضی شکل پر شده با فوم دوبل

Abstract

In this paper, a novel foam-filled double ellipse tube (F-DET) is proposed. First, the circle and ellipse tubes with three different configurations(hollow, foam-filled, double foam-filled) are investigated under axial and oblique impact by using the nonlinear finite element code LS-DYNA. The numerical results showed that the F-DET tube has the best crashworthiness performance than tubes with other configurations. Then to optimize the F-DET tube, the Kriging model about the radial rate f, thickness of wall t and foam density ρf is constructed. Based on the Kriging model, the multiobjective particle swarm optimization (MOPSO) algorithm is utilized to achieve the optimized F-DET tube, foam-filled ellipse(F-ET) tube and foam-filled double circle(F-DCT) tube on the maximizing specific energy absorption (SEA) and minimizing peak crush force (PCF) under multiple loading angles. It can be found that the F-DET tube has better crashworthiness performance than F-ET tube and F-DCT tube. This indicates F-DET tube can be a potential energy absorber under the multiple loading cases.

5. Conclusion

In this study, a novel foam-filled double ellipse tube is proposed. First, the circle and ellipse tubes with three different con- figurations(hollow, foam-filled, double foam-filled) are investigated under axial and oblique impact by using the nonlinear finite element code LS-DYNA. The numerical results showed that the foam- filled double ellipse tube has the best crashworthiness performance than tubes with other configurations. Thus, we focus on the optimization of the foam-filled double ellipse tube. Then, based on the DOE results, the Kriging models of the foam-filled ellipse tube, the foam-filled double ellipse tube and foam-filled double circle tube are constructed. The optimal models of the F-DET, F-ET and F-DCT tubes are achieved by using the multiobjective particle swarm optimization (MOPSO) algorithm. After comparing the Pareto fronts of three kinds of tubes, it is obvious that the energy absorption capability per unit mass of the foam- filled double ellipse tubes is larger than the other two tubes. The SEAα of the F-DET tube is 11.77% higher than the F-ET tube and 10.51% higher than the F-DCT tube at the condition that the PCF equals 80KN. This indicates that the F-DET tube is superior to the F-ET tube and F-DCT tube under the multiple loading.