民机机身耐撞性设计的波纹板布局

 耐撞性是民机机身结构设计的一项重要要求。为了研究以波纹板为吸能结构的机身结构能量吸收特性和冲击响应特性，针对常规的机身构型，提出了3种货舱地板下部波纹板布局形式，建立了相应的机身段有限元模型，对机身垂直撞击刚性地面的情况进行分析。获得了不同布局形式下的波纹板变形模式和能量吸收情况，以及机身段的破坏模式、能量吸收情况和座椅处的过载-时间历程。3种布局的对比分析表明，在机腹隔框下端和蒙皮之间布置波纹板，可以使机身下部结构的破坏模式稳定，显著降低座椅处的过载峰值，缩短高过载脉宽，有效提高机身结构的耐撞性。

Crashworthiness Layout of Civil Aircraft Using Waved-plate for Energy Absorption

Crashworthiness is an important requirement in civil aircraft structural design. In this article, the energy absorption characteristics and impact response characteristics of fuselage structure are studied with waved-plate as energy-absorbing structure. Three waved-plate layouts of subfloor concerning the typical civil aircraft fuselage section are suggested. The vertical impacting on the rigid ground is analyzed with finite element model established. Waved-plate deformations and energy-absorption, fuselage’s failure modes and energy-absorption, as well as overload time history at seats in different layouts are compared in detail. Simulation results show that the layout with waved-plate between the bottom frame and skin can effectively improve the structural crashworthiness of civil aircraft. The failure modes of aircraft fuselage can be efficiently controlled, the overload peak of seats is significantly reduced, and the pulse width of maximum overload is shortened.