- Award Details
MultiSCAN 2000 - A Single Switch Developmental Training Aid for Teachers and Students
Department of Education
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Small Business Information
331 West Second Street, Lexington, KY, 40507
Socially and Economically Disadvantaged:
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AbstractNot Available This SBIR project proposes to design an optimal methodology for the control of the twintail buffet problem encountered with modern fighter aircraft such as the F/A-18, F-15, and the new joint strike fighter (JSF). The buffet problem occurs when vortices emanating from the leading-edge extension of a delta wing break down before reaching the vertical tails. The resultant Unsteady unbalanced loads on the vertical tails can cause premature fatigue failure. A variety of methods for controlling the buffet problem have been proposed, but none have been definitively demonstrated as being an optimal solution. The proposed effort will utilize a state-of-the-art multi-disciplinary computing environment (MDICE) to evaluate the efficacy of a variety of proposed buffet-control methodologies and to design the optimum methodologies under a variety of flight conditions. MDICE will be configured with a computational fluid dynamics module (CFDFASTRAN), a structure dynamics module, and a conservative-consistent technique for fluid-structure interfacing. A controls module will be added when necessary to model certain active control methodologies. The Phase I effort will demonstrate the feasibility of the computational environment for prediction and control of twin-tail buffet. In this effort, the twin-tail buffet responses of a generic fighter aircraft will be computed and validated against the available experimental data. The effort will then be extended to apply three basic flow control methods under a specified set of flight conditions. Under Phase II, the computational environment will be expanded by developing and evaluating the efficacy of a comprehensive set of flow and structure control methodologies for twin-tail buffet alleviation under a wide range of flight conditions. The resulting optimum methodology or combination of methodologies will then be applied to a real fighter aircraft, e.g. F/ A-18.
* information listed above is at the time of submission.