| Citation: | WANG Longfang, HE Weiliang. Parafoil aerodynamic deformation simulation based on cable-membrane finite element model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 47-52. doi: 10.13700/j.bh.1001-5965.2016.0017(in Chinese)
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The fluid-structure coupling deformation of the parafoil was numerically simulated under steady condition. The finite volume method was used to compute the aerodynamic load, and the effect of leading-edge cut and ribs on the pressure distribution was analyzed simultaneously. Nonlinear cable-membrane finite element model was established based on the large displacement-small strain characteristics of parafoil structure. Canopy was modeled by membrane element which was unable to bear bending moment, and ropes and reinforcing tapes were modeled by cable element which could only bear uniaxial tension. The deformation relative to ideal configuration and stress distribution of parafoil were simulated on aerodynamic load. The results show that the span decreases compared with design value in flight, the maximum thickness of airfoil profile increases after bumps appear, and extra angle of attack and sweepback arise from canopy deformation; the maximum equivalent stress is mainly concentrated around holes and rope joints of ribs, and reinforcing tapes must be arranged properly in order to satisfy the strength requirements.
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