ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Crashworthiness characteristics analysis of typical fuselage section of large transport aircraft
Received date: 2022-05-24
Revised date: 2022-07-14
Accepted date: 2022-11-07
Online published: 2022-12-06
Supported by
Tianjin Applied Basic Research Multi input Fund Project(21JCYBJC00690)
To study the crashworthiness characteristics and failure mode of large transport aircraft and develop the finite element modeling and crashworthiness simulation technology of fuselage structures， a three-frame and two-span full-scale fuselage section with two sets of triple seats installed and four FAA Hybrid III Anthropomorphic Test Devices （ATD） placed is firstly designed and manufactured； the crash deformation and response characteristics are then obtained by carrying out a drop test of the typical fuselage section； Finally， a finite element model of fuselage section is established and verified by the drop test results， and the crashworthiness characteristics are evaluated when hitting different grounds （concrete ground and soft grounds）. The results show that at the vertical impact velocity of 6.02 m/s， the upper area of the cabin floor remains basically intact， and the sub-cabin structures are significantly deformed and damaged， resulting in three plastic hinges； the cargo floor beam breaks on one side where it joins the fuselage frame， resulting in a significantly faster peak acceleration of the cabin floor on the same side than on the other side， and the maximum acceleration peak value and impact force are 427.7 m/s2 and 290.8 kN， respectively. The finite element model can accurately simulate the three plastic hinges and the failure of the connection between the cargo floor beam and the fuselage frame， and it is in good agreement with the test results in terms of impact velocity and acceleration. The fuselage frame is the main energy-absorbing component， accounting for 40.7% of the total absorbed energy； when hitting different grounds， the partial impact energy is absorbed by the soft ground， resulting in slightly different failure modes of the fuselage section and a reduction in the peak acceleration transmitted to the occupants.
Haolei MOU , Jiang XIE , Zhenyu FENG , Kun CHENG , Yi LIU . Crashworthiness characteristics analysis of typical fuselage section of large transport aircraft[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(9) : 227512 -227512 . DOI: 10.7527/S1000-6893.2022.27512
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