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Nonlinear analysis of 2D flexible flapping wings

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Abstract

Natural flyers have flexible wings, which deform significantly under the combined inertial and aerodynamic forces. In this study, we focus on the role of chord wise flexibility in 2D pitch and plunge motions. We derive the exact nonlinear 2D equations of motion for a flexible flapping wing with flying support. In achieving the closed-form equations, we use the exact strain field concerning considerable elastic deformations. After numerically solving the novel equations, we validate them in simulations with highly deformable wings. By coupling the derived equations of motion with fluid flow, we study the aerodynamic performance of the geometrically nonlinear flexible flapping wing. Through numerical simulations, we see that a flexible wing generates much lower drag with increasing flexibility. While at angles of attack \(>\) \(50^{\circ }\), more lift is generated by flexible wings.

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Authors and Affiliations

  1. School of Mechanical Engineering, Sharif University of Technology, 11365-9567, Tehran, Iran

    Mohammad H. Abedinnasab

  2. Center of Excellence in Design, Robotics, and Automation, Sharif University of Technology, 11365-9567, Tehran, Iran

    Hassan Zohoor

  3. Academy of Sciences of I.R.Iran, Tehran, Iran

    Hassan Zohoor

  4. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Yong-Jin Yoon

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  1. Mohammad H. Abedinnasab
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  2. Hassan Zohoor
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  3. Yong-Jin Yoon
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Correspondence to Mohammad H. Abedinnasab.

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Abedinnasab, M.H., Zohoor, H. & Yoon, YJ. Nonlinear analysis of 2D flexible flapping wings. Nonlinear Dyn 81, 299–310 (2015). https://doi.org/10.1007/s11071-015-1992-6

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  • DOI: https://doi.org/10.1007/s11071-015-1992-6

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