Aeroelastic Analysis of Preset Angle for A Typical Airfoil Section with Cubic Nonlinear Stiffness. (August 2019)

• Record Type: Journal Article
• Authors: Nan, Guofang; Ding, Di; Wang, Weitao
• Is Part Of: Journal of physics. Volume 1300(2019)
• Publication Date: 2019-08
• Subjects: Aeroelastic -- Preset Angle -- Airfoil -- Cubic Nonlinear Stiffness -- Vibration; Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1300/1/012100
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: The influences of the preset angle on the dynamic responses of the typical airfoil section with cubic nonlinear stiffness were investigated under consideration of the aerodynamic flutter onset due to certain angle of attack. The typical airfoil model with cubic nonlinear stiffness is developed to analyze the plunging and the pitching motions for the airfoil section. Based on the Grossman's quasi steady aerodynamic model, the aerodynamic lift and the moment can be obtained and then the equation of motion for the airfoil section is derived by applying the Lagrange theorem. The effects of the preset angle and the oncoming flow speed on the nonlinear dynamics are analyzed by means of the bifurcation diagram, the frequency-amplitude diagram, the time history, etc. Simulation results show that the preset angle influences the intensity of the vibration, moderate or severe, stable or unstable, even under certain circumstance, the jump and chaos phenomenon occur; and the oncoming flow speed affects the distribution of the vibration energy for the plunging and the pitching motions. The unstable stall region for the responding parameters should be avoided to keep the airfoil safe in engineering practice. Some qualitative and quantitative rules are obtained for the airfoil design and the flutter suppression.