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| Geometrical Nonlinear Flutter Research of a High-aspect-ratio Wing through Wind Tunnel Test |
| Received:June 28, 2018 Revised:January 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.01.013 |
| KeyWord:high-aspect-ratio wing geometrical nonlinear aeroelastic flutter |
| Author | Institution |
| ZENG Hui-hua |
Shenyang Aircraft Design & Research Institute, Shenyang , China |
| LIU Zhong-kun |
Shenyang Aircraft Design & Research Institute, Shenyang , China |
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| Abstract: |
| Objective To research geometrical nonlinear flutter problem induced by geometrical nonlinear effects because of large structure deformation of high-aspect-ratio wing during flying. Method A wind tunnel test model corresponding to the ge-ometrical nonlinear flutter problem was designed to carry out wind tunnel test under different wing deformations, compare the test results and get the geometrical nonlinear flutter characteristics. Results Under the influences of geometrical nonlinear, the flutter speed was decreased with the increase of deformation. The divergency mode and flutter frequency were also changed because of the influence of geometrical nonlinear. In large deformation, flutter speed was decreased to 71.7 percent of small deformation. Conclusion When the aeroelastic character of high-aspect-ratio flexible wing is analyzed, the influence of geometrical nonlinear must be considered; otherwise it will cause large error for the conclusions of flutter character. |
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