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| The aeroelastic analysis of the high aspect ratio wing considering the geometric nonlinearity |
| YANG Zhi-chun，ZHANG Hui，GU Ying-song，SONG Miao |
| Institute of Structural Dynamics and Control, School of Aeronautics, Northwestern Polytechnical University |
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Abstract The large deformation of the high aspect ratio wing during flight has an important effect on the aeroe-lastic stability. The aerodynamic performance and flying safety of the high-altitude，long-endurance uninhabited air vehicles are largely affected. Therefore, the geometric nonlinearity of the high aspect ratio wing can’t be ignored. Based on the secondary development of MSC.Nastran software, the method to analyzing the aeroelastic characteristics consid-ering the geometric nonlinearity is established. Considering the effect of the large geometric deformation on the aerody-namic surface grid, the aerodynamic surface grid is updated at every iterative step, the static aeroelastic deformation at the flight condition can be obtained when the iteration is convergent, then the flutter characteristic of the large aspect ratio wing is analyzed based on the stiffness matrix considering the geometric nonlinearity. Using this method, the aeroe-lastic characteristic of the large aspect ratio wing model is analyzed, it is shown that comparing with the linear result the dynamic aeroelastic characteristic is affected by the static aeroelastic deformation, the torsion frequency of the wing will decrease and the coupled bending- torsional flutter velocity will drop at the same time. The result of the method is the same as the reference, which validates the feasibility of this method.
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Received: 09 April 2013
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2014, Vol. 33 
