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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (12): 3200-3210.doi: 10.12382/bgxb.2021.0669

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Flutter Characteristics of High Aspect Ratio Multi-segment Folding Wings with Equal Section

TIAN Sumei1, ZHANG Yingpeng1, ZHANG Heming2, QI Wuchao2   

  1. (1.College of Aeroengine, Shenyang Aerospace University, Shenyang 110136, Liaoning, China; 2. Key Laboratory of Liaoning Province for Aircraft Composite Structural Analysis and Simulation, Shenyang Aerospace University, Shenyang 110136, Liaoning, China)
  • Online:2022-05-21

Abstract: Flutter characteristics of high aspect ratio multi-segment folding wings are studied. A beam element considering bending and torsion deformations is used to simulate the two deformation modes of bending and torsion. Combined with the modified aerodynamic strip theory, flutter velocities and flutter frequencies of the high aspect ratio wing at different folding angles are obtained. Considering changes of the folding angle of each segment of the wing, a structural dynamic model including the parameter of folding angles is established based on the finite element theory. Then the dynamic model is reduced and decoupled by modal truncation. According to Theodorsen's unsteady aerodynamic theory, aerodynamic lifts and pitching moments on the bending-torsion beam element are modified in the frequency domain. And an artificial structural damping is introduced based on the V-g method for flutter calculation. The flutter calculations for the multi-segment folding wings under different folding angles reveal that: the natural frequencies of the wing structures show nonlinear growth with the change of folding angles; the variation laws of flutter velocities and flutter frequencies with folding angles are basically the same; the existence of the outer wing folding angle can effectively improve the flutter velocity of the wing; the number of wing segments has no obvious effect on flutter velocities when the outermost wing folding angle is fixed.

Key words: flutter, multi-segmentfoldingwing, largeaspectratio, bending-torsionbeamelement

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