Technical Note: Exploratory Investigation of Time‐Finite‐Element and Fast‐Floquet Methods for Trim and Stability Analysis

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Abstract:

A numerical technique based on combining time‐finite‐element and fast‐Floquet methods is presented for linearized perturbation equations about the steady‐state solution. Numerical results for a two‐bladed horizontal‐axis wind turbine show that this combination reduces the number of equations and unknowns in the discretized equations, thus leading to a reduction in computational effort for finding the Floquet transition matrix. Because the approach leads to an improvement over a straightforward use of time‐finite elements for wind‐turbine problems, a similar level of improvement may be expected for rotorcraft problems.

Document Type: Research Article

DOI: http://dx.doi.org/10.4050/1.3092856

Affiliations: Georgia Institute of Technology Atlanta, GA

Publication date: April 1, 2005

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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