Dynamic response of Voronoi structures with gradient perpendicular to the impact direction

Gradient porous structures are extensively studied in impact-resistant structures due to their light weight and high energy absorption. Different from existing studies, this article focuses on novel Voronoi structures with gradient perpendicular to impact direction, and compares their dynamic response with the uniform structure through numerical simulation. It shows that the novel gradient design comprehensively improves the impact resistance of Voronoi structures. Furthermore, density gradient is introduced into the one-dimensional shock model, and the theoretical solution of the plateau stresses at the impact end are compared with the simulation results, which verifies the correctness of the model in this article

高速受电弓气动减阻的仿真优化研究

随着绿色环保的现代轨道交通设计理念发展，受电弓减阻成为制约高速列车提速的关键问题之一。高速列车运行时，受电弓暴露于流线型车体之外，是列车气动阻力的主要来源之一，随着列车速度的提高，受电弓的减阻问题亟待解决。本文针对某型高速受电弓，基于计算流体动力学仿真技术，分析了整弓气动阻力分布，确定滑板与底座的压差阻力是气动阻力的主要来源，提出了滑板流线型减阻外壳与底座包裹流线型减阻外壳的优化方案，并与原模型对比验证了减阻效果。计算表明，减阻模型在350 km/h运行时，整弓气动阻力在开口、闭口时分别降低25.13%与24.19%