【摘要】 适坠性是民用飞机适航取证的重要内容，对此开展研究具有重要意义。以某型民用飞机等直段为研究对象，进行了适坠性分析，研究了机身段的变形失效和各个部件的吸能特性。研究表明：各个部件内能曲线的变化趋势表现出一致的相关性，均与机身框的失效形式密切相关，且机身框及剪切角片是最主要的吸能结构；客舱下部大变形区域的紧固件吸能效果显著，仿真分析时不能忽略紧固件或者使用刚性梁代替可变形的紧固件。因此，适坠性研究需要重点关注客舱下部机身框的吸能特性。更多还原

【Abstract】 Crashworthiness is an important part of civil aircraft airworthiness certification, and the research on it is of great significance.In this paper, taking the straight fuselage section of a civil aircraft as the research object, the crashworthiness analysis is carried out, and the deformation failure of the fuselage and the energy absorption characteristics of each component are studied.It is found that the trend of the internal energy curve of each component shows a consistent correlation during the crash, which is closely related to the failure mode of the fuselage frame, and the fuselage frame and shear clips are the most important energy absorption structures; the energy absorption effect of fasteners in large deformation area is significant, so fasteners cannot be ignored or be replaced by rigid beams in simulation analysis.Therefore, the crashworthiness design needs to focus on the energy absorption characteristics of the fuselage frame under the cabin.更多还原