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| Geometric Nonlinear Flutter Analysis of High Aspect Ratio Unmanned Aerial Vehicles |
| Received:August 09, 2024 Revised:September 09, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.09.013 |
| KeyWord:flutter geometric nonlinearity high aspect ratio unmanned aerial vehicles surface effect aerodynamics |
| Author | Institution |
| LI Guangyao |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| LU Jia |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| HU Wei |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
| XU Yan |
AVIC Chengdu Aircraft Industrial Group Co., Ltd., Chengdu , China |
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| Abstract: |
| The work aims to conduct flutter analysisbased on the geometric deformation characteristics of high aspect ratio unmanned aerial vehicles.Based on the nonlinear dynamic characteristics of high aspect ratio unmanned aerial vehicles in large deformation states, the structural stiffness in nonlinear equilibrium states was obtained. The nonlinear flutter characteristics of high aspect ratio unmanned aerial vehicles were obtained by coupling with unsteady aerodynamics. On this basis, the flutter characteristics of high aspect ratio unmanned aerial vehicles under the coupling of flat plate aerodynamics and structural nonlinear dynamics considering surface effects were explored. Considering geometric nonlinearity, the flutter velocity decreased by about 8% compared with linear flutter velocity. Andconsidering surface effects, the flutter velocity decreased by about 11% compared with flat aerodynamic forces. The calculation results indicate that the geometric nonlinearity caused by large structural deformation can cause coupling of horizontal and vertical wing motion, change the corresponding frequency and vibration mode, thereby affecting the aeroelastic coupling relationship and reducing the critical flutter velocity. Moreover, aerodynamic models that consider surface effects can alter the interpolation relationship with structural models, leading to a decrease in the critical flutter velocity. |
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