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Journal of Aerospace Science and Technology، جلد ۱۶، شماره ۲، صفحات ۳۳-۳۹
عنوان فارسی On the Effects of Stiffness Ratio in Nonlinear Aeroelastic Stability of a Folding Wing
چکیده فارسی مقاله In this paper, the effects caused by the combination of folding angles simultaneously with changing the stiffness ratio of different parts of a folding wing are investigated. The geometrically exact fully intrinsic equations are employed to simulated the wing nonlinear dynamic behavior. The important advantages of these geometrically exact equations can be seen as complete modeling without simplifying assumptions in large deformations, low-order nonlinearities, and thus less complexity. In this research, folding angles have been used in the geometrically exact fully intrinsic beam equations and the combination of different folding angles is studied. The applied aerodynamic loads in an incompressible flow regime are determined employing Peter’s unsteady aerodynamic model. In order to check the stability of the system, first the resulting non-linear partial differential equations are discretized, and then linearized about the nonlinear steady-state condition. By obtaining the eigenvalues of the linearized system, the stability of the wing is evaluated. Furthermore, investigation of the effects of the stiffness on the flutter speed and frequency of the folding wing for various folding angles, is another achievement of this study. It is observed that the combination of folding angles can significantly delay the flutter speed and improve the performance of the bird.
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی On the Effects of Stiffness Ratio in Nonlinear Aeroelastic Stability of a Folding Wing
چکیده انگلیسی مقاله In this paper, the effects caused by the combination of folding angles simultaneously with changing the stiffness ratio of different parts of a folding wing are investigated. The geometrically exact fully intrinsic equations are employed to simulated the wing nonlinear dynamic behavior. The important advantages of these geometrically exact equations can be seen as complete modeling without simplifying assumptions in large deformations, low-order nonlinearities, and thus less complexity. In this research, folding angles have been used in the geometrically exact fully intrinsic beam equations and the combination of different folding angles is studied. The applied aerodynamic loads in an incompressible flow regime are determined employing Peter’s unsteady aerodynamic model. In order to check the stability of the system, first the resulting non-linear partial differential equations are discretized, and then linearized about the nonlinear steady-state condition. By obtaining the eigenvalues of the linearized system, the stability of the wing is evaluated. Furthermore, investigation of the effects of the stiffness on the flutter speed and frequency of the folding wing for various folding angles, is another achievement of this study. It is observed that the combination of folding angles can significantly delay the flutter speed and improve the performance of the bird.
کلیدواژه‌های انگلیسی مقاله Folding wing,nonlinear aeroelasticity,fully intrinsic equations,stiffness effects,folding angle
نویسندگان مقاله Sayed Hossein Moravej Barzani |
Department of Mechanical Engineering, Faculty of Engineering, University of Isfahan, Iran

Mahdi Mortazavi |
Department of Mechanical Engineering, Faculty of Engineering, University of Isfahan, Iran

Hossein Shahverdi |
Department of Aerospace Engineering Amirkabir University of Technology (Tehran Polytechnic)

نشانی اینترنتی https://jast.ias.ir/article_171596_3ced198a45a1e7605bbfbf0f09638432.pdf
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