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针对复合材料飞机结构适坠性验证及适航审定需求,建立货舱地板下部为波纹板的复合材料蒙皮机身框段有限元模型及货舱货物刚体简化模型,研究其在7 m/s垂直坠撞条件下的适坠性能。通过与无货舱货物情况进行对比,分析货舱载荷对机身结构变形模式、加速度响应特性和机身结构吸能特性的影响,进而为飞机结构适坠性设计及分析提供参考。仿真结果表明,货舱载荷导致货舱下部波纹板严重变形,但吸能量增加,外侧座椅与地板连接处的加速度低于无货舱货物情况,坠撞过程中机身各部分结构吸能是同时进行的。
Aiming at the requirement of composite airplane’s structural suitability and airworthiness validation, a finite element model of composite material skin frame and a simplified rigid body model of cargo are established, Impact fit conditions under the falling performance. Through the comparison with the cargo without cargo, the influence of cargo load on the deformation mode, acceleration response and the energy absorption characteristics of the fuselage structure are analyzed, which will provide reference for the design and analysis of the aircraft structure. The simulation results show that the load of the cargo hold causes the corrugated plate in the lower part of the cargo hold to deform seriously, but the energy absorption increases and the acceleration of the connection between the outside seat and the floor is lower than that of the cargo without cargo. The structural energy absorption of the various parts of the fuselage during the collision is simultaneous .