Analytical model and stability analysis of the leading edge spar of a passively morphing ornithopter wing.


:This paper presents the stability analysis of the leading edge spar of a flapping wing unmanned air vehicle with a compliant spine inserted in it. The compliant spine is a mechanism that was designed to be flexible during the upstroke and stiff during the downstroke. Inserting a variable stiffness mechanism into the leading edge spar affects its structural stability. The model for the spar-spine system was formulated in terms of the well-known Mathieu's equation, in which the compliant spine was modeled as a torsional spring with a sinusoidal stiffness function. Experimental data was used to validate the model and results show agreement within 11%. The structural stability of the leading edge spar-spine system was determined analytically and graphically using a phase plane plot and Strutt diagrams. Lastly, a torsional viscous damper was added to the leading edge spar-spine model to investigate the effect of damping on stability. Results show that for the un-damped case, the leading edge spar-spine response was stable and bounded; however, there were areas of instability that appear for a range of spine upstroke and downstroke stiffnesses. Results also show that there exist a damping ratio between 0.2 and 0.5, for which the leading edge spar-spine system was stable for all values of spine upstroke and downstroke stiffnesses.


Bioinspir Biomim


Wissa A,Calogero J,Wereley N,Hubbard JE Jr,Frecker M




Has Abstract


2015-10-26 00:00:00












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    journal_title:Bioinspiration & biomimetics

    pub_type: 杂志文章


    authors: Wolff JO,Wells D,Reid CR,Blamires SJ

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    journal_title:Bioinspiration & biomimetics

    pub_type: 杂志文章


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    journal_title:Bioinspiration & biomimetics

    pub_type: 杂志文章


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    journal_title:Bioinspiration & biomimetics

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    authors: Karlinsey RL,Yi K,Duhn CW

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    authors: Otero TF

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    journal_title:Bioinspiration & biomimetics

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    authors: Cao F,Li D

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