dc.contributor.author Mathews, Edward Henry dc.contributor.author Van Zyl, Louwrens Hermias dc.date.accessioned 2012-10-24T08:01:18Z dc.date.available 2012-10-24T08:01:18Z dc.date.issued 2011 dc.identifier.citation Van Zyl, L.H.& Mathews, E.H. 2011. Aeroelastic analysis of T-tails using an enhanced doublet lattice method. Journal of aircraft, 48(3):823-833. [http://arc.aiaa.org/loi/ja ] en_US dc.identifier.issn 0021-8669 dc.identifier.issn 1533-3868 (Online) dc.identifier.uri http://hdl.handle.net/10394/7632 dc.description.abstract The subsonic doublet lattice method is widely used to calculate unsteady air loads for aeroelastic analyses. Despite its widespread use and significant improvements in other aspects of the method, its application to the flutter analysis of T-tail aircraft is lagging in terms of accuracy and the efficiency of the process. In particular, the doublet lattice method does not calculate all the necessary aerodynamic loads for T-tail flutter analysis. It is common practice to calculate additional aerodynamic loads outside of the doublet lattice method and add them to the doublet lattice method results before solving the flutter equation. This paper describes the extension of the doublet lattice method to account for these loads. The boundary condition is made more general to account for yaw/dihedral and sideslip/dihedral coupling. The calculation of forces is generalized to account for lateral load due to roll and roll rate, rolling moment due to yaw, yaw rate and oscillatory sideslip, and yawing moment due to roll rate. In addition, the steady-state load and the quadratic mode shapes are taken into account in the calculation of generalized forces. en_US dc.language.iso en en_US dc.publisher American Institute of Aeronautics & Astronautics en_US dc.title Aeroelastic analysis of T-tails using an enhanced doublet lattice method en_US dc.type Article en_US
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