大型飞机货舱地板下部结构吸能特性研究  

STUDY ON ENERGY ABSORPTION CHARACTERISTICS OF THE SUBCARGO FUSELAGE SECTION OF LARGE AIRCRAFTS

作　　者：王伟俊 牟浩蕾 孙滨 孙金波 刘秀芝 王晓红 WANG Weijun;MOU Haolei;SUN Bin;SUN Jinbo;LIU Xiuzhi;WANG Xiaohong(Department of Structure and Strength,Shenyang Aircraft Airworthiness Certification Center of CAAC,Shenyang 110044,China;Key Laboratory of Technology and Equipment of Urban Air Transportation System of Tianjin,Tianjin 300300,China;College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民用航空沈阳航空器适航审定中心结构强度室,沈阳110044 [2]天津市城市空中交通系统技术与装备重点实验室,天津300300 [3]中国民航大学安全科学与工程学院,天津300300

出　　处：《力学与实践》2024年第2期280-289,共10页Mechanics in Engineering

基　　金：天津市城市空中交通系统技术与装备重点实验室开放基金(TJKL-UAM-202308)资助。

摘　　要：为了研究大型客机货舱地板下部结构吸能特性,在已开展的3框两跨货舱地板下部结构落重冲击试验基础上,建立了结构的细节有限元模型,开展了坠撞动力学仿真分析。与试验结果对比分析了货舱地板下部结构的变形模式、关键点位移及落重速度变化情况等,并得到了各部件能量吸收情况。研究结果表明:货舱地板下部结构有限元模型总体刚度与试验件基本相同,验证了有限元模型和材料模型的准确性。建立了货舱地板下部结构垂直坠撞工况模型,验证了货舱地板下部结构垂直坠撞与落重冲击工况的等效性。同时建立货舱地板下部结构垂直坠撞俯仰(3°,5°,7°和9°)与滚转(3°,5°,7°和9°)模型,通过变形模式及吸能分析对比,进行了俯仰、滚转对货舱地板下部结构适坠性的影响分析。结果显示,货舱地板下部结构俯仰及滚转对框组件、立柱及横梁变形和吸能有较大的影响。货舱地板下部结构适坠性研究可以为客舱地板下部结构适坠性设计和分析研究提供技术支持。To study the energy absorption characteristics of sub-cargo fuselage section of a large passenger aircraft,based on the crash test that was carried out on the sub-cargo fuselage section with three frames and two spans,the detailed finite element model of the structure was established,and the crash dynamics simulation analysis was carried out.The deformation mode,key point displacement and fall velocity of the sub-cargo fuselage section were analyzed compared with the test results,and the energy absorption of each component was obtained.The results show that the overall stiffness of the finite element model of the sub-cargo fuselage section is basically the same as the test part,which verifies the accuracy of the finite element model and the material model.The model of vertical impact of sub-cargo fuselage section is established,and the equivalence of vertical impact and falling weight impact of the sub-cargo fuselage section is verified.At the same time,the vertical impact models(pitch 3°,5°,7°,9°;roll 3°,5°,7°,9°)of the sub-cargo fuselage section are established,and the influence of pitch and roll on the sub-cargo fuselage section is analyzed through deformation mode and energy absorption analysis.The results show that the pitch and roll of the sub-cargo fuselage section have great influence on the deformation and energy absorption of the frame assembly,the column and the beam.The study on the sub-cargo fuselage section can provide technical support for the design and analysis of the substructure of passenger floor.

关 键 词：货舱地板下部结构 适坠性 俯仰 滚转 吸能特性 

分 类 号：O39[理学—工程力学]