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To study the energy absorption characteristics of sub-floor structure of a large aircraft, a detailed finite element model of the structure was established, and crash dynamics simulation analysis was carried out. Through the analysis, the time—history deformation of sub-floor structure and the energy absorption of each component were obtained. In order to study the influence of the moments of inertia in the roll and pitch directions on the crash characteristics, models of the moments of inertia in the roll and pitch directions (with a 5% deviation) of sub-floor structure were established. By analyzing and comparing the deformation modes, the influence of the deviated moments of inertia in the pitch and roll directions on the crashworthiness of sub-floor structure was analyzed. The results show that the moment of inertia in the roll direction (with a 5% deviation) of sub-floor structure has a significant impact on the overall deformation. The research on the crashworthiness of sub-floor structure can provide technical support for the crashworthiness design and analysis of the entire aircraft.

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Research on the Crashworthiness of a Typical Fuselage Section

  • 会议论文

  • 发表日期：

    2026年

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  • Weijun Wang,
  • Xiulu Zhang,
  • Jinbo Sun,
  • Guocheng Lv,
  • Xiaohong Wang,
  • Xiaoguang Zhao

摘要

To study the energy absorption characteristics of sub-floor structure of a large aircraft, a detailed finite element model of the structure was established, and crash dynamics simulation analysis was carried out. Through the analysis, the time—history deformation of sub-floor structure and the energy absorption of each component were obtained. In order to study the influence of the moments of inertia in the roll and pitch directions on the crash characteristics, models of the moments of inertia in the roll and pitch directions (with a 5% deviation) of sub-floor structure were established. By analyzing and comparing the deformation modes, the influence of the deviated moments of inertia in the pitch and roll directions on the crashworthiness of sub-floor structure was analyzed. The results show that the moment of inertia in the roll direction (with a 5% deviation) of sub-floor structure has a significant impact on the overall deformation. The research on the crashworthiness of sub-floor structure can provide technical support for the crashworthiness design and analysis of the entire aircraft.