Nonlinear Aeroelastic Modeling of a Folding Wing Structure

The nonlinear aeroelastic response of a folding wing with the hinge free-play nonlinearity is investigated. A nonlinear structural dynamic model is established based on the modal synthesis of free-substructures by modification of the connected relationships, and is unnecessary to re-establish it if...

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Bibliographic Details
Published in:Journal of physics. Conference series 2019-05, Vol.1215 (1), p.12009
Main Authors: Li, Peicheng, Ni, Yingge, Hou, Chi, Wan, Xiaopeng, Zhao, Meiying
Format: Article
Language:English
Subjects:
Aerodynamic forces
Aeroelasticity
Dynamic models
Folding
Limit cycle oscillations
Nonlinear response
Nonlinearity
Physics
Rational functions
Runge-Kutta method
Stiffness
Unsteady aerodynamics
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Summary:The nonlinear aeroelastic response of a folding wing with the hinge free-play nonlinearity is investigated. A nonlinear structural dynamic model is established based on the modal synthesis of free-substructures by modification of the connected relationships, and is unnecessary to re-establish it if the stiffness changes. The nonlinear aeroelastic equation is obtained by rational function approximation of the unsteady aerodynamic force, and solved by Runge-Kutta method to predict the aeroelastic response of the folding wing. The results show that the free-play at hinges changes the aeroelastic characteristic of the folding wing, leading to the occurrence of the limit cycle oscillation within a certain velocity range. Moreover, the sensitivity to the free-play is different for the inboard and outboard hinges. If the free-play is controlled within a certain value, the motion of nonlinear aeroelastic system of the folding wing can be considered linear approximately.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1215/1/012009