Fluid-Structure Interaction Analysis of the Fish Bone Active Camber Concept
BKS Woods, I Dayyani & MI Friswell (Swansea University)
Journal of Aircraft, Vol. 52, No. 1, January 2015, pp. 307-319
A coupled, partitioned fluid-structure interaction analysis is introduced for calculation of the deformed equilibrium shape, aerodynamic coefficients, and actuation requirements of the Fish Bone Active Camber morphing concept. The Fish Bone Active Camber concept is a high authority morphing camber architecture with a broad range of applications; including fixed wing aircraft, helicopters, wind turbines, and tidal stream turbines. The low chordwise bending stiffness of the morphing structure, high stiffness of the tendon drive system, and the large changes in aerodynamic loading while morphing necessitate a coupled fluid-structure interaction analysis for determination of the static equilibrium. An Euler-Bernoulli beam theory based analytical model of the structure is introduced and validated. Aerodynamic loads are found using XFOIL software, which couples a potential flow panel method with a viscous boundary layer solver. Finally, the tendons are modeled as linear stiffness elements whose internal strains are found from Euler-Bernoulli theory and whose axial forces create bending moments on the spine at their discrete mounting points. Convergence of the FSI code is stabilized through incorporation of relaxation parameters. Results for two chosen test cases are presented to give insight into the mechanical and aerodynamic behavior of the FishBAC concept.
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Link to paper using doi: 10.2514/1.C032725
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