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Deterministic and Statistical Characterization of the Impact of Control Surface Freeplay on Flutter and Limit -Cycle Oscillation (LCO) using Efficient Computational Modeling
Navy STTR FY2010.A
| Sol No.: |
Navy STTR FY2010.A |
| Topic No.: |
N10A-T003 |
| Topic Title: |
Deterministic and Statistical Characterization of the Impact of Control Surface Freeplay on Flutter and Limit -Cycle Oscillation (LCO) using Efficient Computational Modeling |
| Proposal No.: |
N10A-003-0328 |
| Firm: |
Advanced Dynamics, Inc.
1500 Bull Lea Road, Suite 203
Lexington, Kentucky 40511-1268 |
| Contact: |
Patrick Hu |
| Phone: |
(859) 699-0441 |
| Web Site: |
www.advanceddynamics-usa.com |
| Abstract: |
Research is proposed for the development and implementation of state of the art computational and experimental tools for the investigation of the impact of control surface freeplay on the flutter and limit cycle oscillation characteristics of two-dimensional and three-dimensional wings in subsonic and transonic flow. Highly efficient and accurate aeroelastic simulation tools will be constructed based upon the following novel concepts 1) reduced order in time models based upon the mathematical formalism of optimal prediction theory 2) high-fidelity aeroelastic simulation based upon the coupling of a particle-method based CFD method to a nonlinear finite element structural dynamics solver and 3) reduced order in spatial models based upon proper orthogonal decomposition (POD) and Volterra theory. In addition, the proposed work will include the use of computational uncertainty quantification which will address, using a probabilistic approach, questions pertaining to the sensitivity of flutter and limit cycle oscillation with respect to possibly uncertain model input parameters such as the amount of freeplay and the freeplay stiffness. Legacy wind tunnel data along with new tests for the transonic regime will be used to validate and improve the computational models and to provide further insight into the complex phenomena of freeplay-induced flutter and limit cycle oscillations. |
| Benefits: |
A broad range of military applications exists for the software infrastructure that is expected to result from this STTR effort, and Navy will be the initial target. The direct application to the Navy represents a prime opportunity for further product development and enhancement, as well as a potential revenue stream from engineering support and technology acquisition. Various DoD components likely to have interests in this technology are the US Air Force and Army. Particularly, Air Force has a lot of research going on in control surface freeplay. Non-military applications represent another potential market sector. Improvements in the computational accuracy and efficiency for control surface freeplay modeling are needed for a wide range of aerospace applications. The accurate assessment of the impact of control surface freeplay on flutter ad LCO has been known to be very important in designing safe aircraft. Companies such as Boeing, Lockheed-Martin, Bell, Sikorsky, and AeroVironment are our industrial partners, and during our briefing for the technology to be developed in this STTR, they indicated their strong interest. They will be actively involved in this project and they are expected to be immediate users of the end computational model and the test articles.
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