This paper focuses on the design of an impact-resistant protective structure for an ejection flight data recording and emergency tracking system.To ensure that the protective structure possesses excellent impact resis...This paper focuses on the design of an impact-resistant protective structure for an ejection flight data recording and emergency tracking system.To ensure that the protective structure possesses excellent impact resistance and energy absorption performance under the design constraints of light weight and miniaturization,a preliminary design of the impact-resistant protective structure is achieved by adopting a thin-walled shell with a periodic perforation pattern based on the analysis of protective theory and design principles.A parametric study of the structure through axial compression simulations indicate that the structure exhibits superior energy absorption when subjected to lower impact velocities,larger wall thicknesses,and moderate hole diameters.A multi-objective optimization for structural dimensions is conducted to maximize specific energy absorption and minimize peak crushing force.The performance of the impact-resistant structure is validated with a numerical model by analyzing the stress distribution and acceleration of the circuit board.The results show that the optimized structure reduces the peak stress by 15%and the maximum acceleration by 44%.展开更多
基金supported by the Shanghai Central Guidance Science and Technology Development Fund[YDZX20233100004008].
文摘This paper focuses on the design of an impact-resistant protective structure for an ejection flight data recording and emergency tracking system.To ensure that the protective structure possesses excellent impact resistance and energy absorption performance under the design constraints of light weight and miniaturization,a preliminary design of the impact-resistant protective structure is achieved by adopting a thin-walled shell with a periodic perforation pattern based on the analysis of protective theory and design principles.A parametric study of the structure through axial compression simulations indicate that the structure exhibits superior energy absorption when subjected to lower impact velocities,larger wall thicknesses,and moderate hole diameters.A multi-objective optimization for structural dimensions is conducted to maximize specific energy absorption and minimize peak crushing force.The performance of the impact-resistant structure is validated with a numerical model by analyzing the stress distribution and acceleration of the circuit board.The results show that the optimized structure reduces the peak stress by 15%and the maximum acceleration by 44%.
