Vertical crash response of typical fuselage frame section and analysis of


	occupant lumbar injury

Abstract

Abstract:

To analyze the crash response, structural energy absorption, and occupant injury of a large aircraft fuselage frame

section in the vertical crash test, firstly, the finite element model of typical fuselage frame section-seat-occupant of

a large aircraft is established. Secondly, the failure mode of fuselage frame section and occupant response of the test

piece and this finite element model are compared and analyzed. Finally, the crash energy absorption is analyzed on

different components of the fuselage frame section, and the occupant injury situation is analyzed from the perspectives of lumbar compression load and pelvic acceleration. The simulation results show that the finite element model

of fuselage frame section-seat-occupant can effectively simulate the failure mode of fuselage frame section, one

plastic hinge at the middle support area of the the lower structure of the cargo floor and two plastic hinges at the

connections between cabin floor support columns and fuselage frames, and occupant response is effectively validated. From the perspective of energy absorption, at the vertical crash velocity of 6.02 m/s, the fuselage frame, skin

and connecting corner pieces are the main energy absorbing components, and from the perspective of occupant injuries, simulation results show that the lumbar compression load of occupant is less than 6 672 N and the pelvic acceleration is within the acceptable range of human injury. Furthermore, the dynamic response index (DRI) value

obtained from floor acceleration is lower compared with that of pelvic acceleration. The survival space in the cabin area of the fuselage frame section is maintained, and the injury risk of the occupant lumbar compression load and

pelvic acceleration is relatively small for a certain type of aircraft at a crash speed of 6.02 m/s. The research conclusion of this article can provide reference for the design of large civil aircraft fuselage structure.

Key words:

crashworthiness, fuselage frame section crash response, occupant crash response, crash energy absorption, occu－

pant injury analysis

CLC Number:

V223+ .2

XIE Jiang a , XIE Weiwei b , CUI Shurui c , MOU Haolei a.

Vertical crash response of typical fuselage frame section and analysis of

occupant lumbar injury

[J]. Journal of Civil Aviation University of China, 2024, 42(6): 1-8.

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Vertical crash response of typical fuselage frame section and analysis of

occupant lumbar injury

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