1 1 Earl Dowell Mechanical Engineering and Materials Science Duke University RESEARCH INTERESTS DYNAMICS OF FLUID-STRUCTURE INTERACTION (AEROELASTICITY) UNSTEADY (TIME DEPENDENT) AERODYNAMICS STRUCTURAL DYNAMICS PHYSICAL PHENOMENA OF INTEREST DYNAMIC INSTABILITIES AND RESPONSE INCLUDING FLUTTER (LINEAR) LIMIT CYCLE OSCILLATIONS (NONLINEAR) BUFFETING (FLOW INSTABILITY) TURBULENCE AIR FORCE APPLICATIONS F-16 FLUTTER AND LIMIT CYCLE OSCILLATIONS F-22 FREEPLAY INDUCED LIMIT CYCLE OSCILLATIONS F-35 ??????
2 2 2 F-16 FLUTTER AND LIMIT CYCLE OSCILLATIONS PAPERS Thomas, J. P., Custer, C. H., Dowell, E. H., and Hall, K. C., "F-16 Fighter Aeroelastic Computations Using a Harmonic Balance Implementation of the OVERFLOW~2 Flow Solver," AIAA Paper 2010-2632, 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials (SDM) Conference, Orlando, FL, April, 2010. Dowell, E. H., Thomas, J. P., Hall, K. C., and Denegri C. M., Jr., "Theoretical Predictions of F-16 Fighter Limit Cycle Oscillations for Flight Flutter Testing," Journal of Aircraft, Vol. 46, No. 5, 2009, pp. 1667-1672. Thomas, J. P., Dowell, E. H., Hall, K. C., and Denegri C. M., "Virtual Aeroelastic Flight Testing for the F-16 Fighter with Stores," AIAA Paper 2007-1640, U.S. Air Force T&E Days, Destin, FL, February, 2007. Thomas, J. P., Dowell, E. H., Hall, K. C., and Denegri, C. M., "An Investigation of the Sensitivity of F- 16 Fighter Limit Cycle Oscillations to Uncertainties," AIAA Paper 2006-1847, 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials (SDM) Conference, Newport, RI, May, 2006. Thomas, J. P., Dowell, E. H., Hall, K. C., and Denegri, C. M., "Further Investigation of Modeling Limit Cycle Oscillation Behavior of the F-16 Fighter Using a Harmonic Balance Approach," AIAA Paper 2005-1917, 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials (SDM) Conference, Austin, TX, April, 2005. Thomas, J. P., Dowell, E. H., Hall, K. C., and Denegri C. M., "Modeling Limit Cycle Oscillation Behavior of the F-16 Fighter Using a Harmonic Balance Approach," AIAA Paper 2004-1696, 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials (SDM) Conference, Palm Springs, CA, April, 2004.
3 3 3 3 FREEPLAY FLUTTER AND LIMIT CYCLE OSCILLATIONS PAPERS 1. Conner, M.C., Tang, D.M., Dowell, E.H. and Virgin, L.N., “Nonlinear Behavior of A Typical Airfoil Section with Control Surface Freeplay: A Numerical and Experimental Study. Journal of Fluids and Structures”, 11, pp.89-112(1997). 2. Tang, D.M., Conner, M.C. and Dowell, E.H., ”A Reduced Order Aerodynamic Model and its Applications to a Nonlinear Aeroelastic System,” Journal of Aircraft, 35 , No. 2, Jan-Feb, 1998, pp 332-338. 3. Tang, D.M., Dowell, E.H. and Virgin, L.N., ”Limit Cycle Behavior of an Airfoil with a Control Surface,” Journal of Fluids and Structures, Vol.12, No.7, 1998, pp 839-858. 4. Tang, D.M., Denis Kholodar and Dowell, E.H., ”Nonlinear Aeroelastic Response of A Airfoil Section with Control Surface Freeplay to Gust Loads”, AIAA Journal, Vol.38, No. 9, 2000, pp. 1543-1557. 5. Tang, D.M. and Dowell, E.H., ”Flutter and Limit Cycle Oscillations for A Wing-Store Model With Freeplay ,” Journal of Aircraft,, Vol.43, No.2, 2006, pp. 487-503. 6. Tang, D.M. and Dowell, E.H., ”Experimental and Theoretical Study of Gust Response for a Wing-Store Model with Freeplay ,” Journal of Sound and Vibration , 295(2006), pp.659-684. 7. Tang, D.M. and Dowell, E.H., ”Aeroelastic Airfoil with Free Play at Angle of Attack with Gust Excition ,” AIAA Journal, Vol. 48, No. 2 (Feb.),pp.427-442, 2010. 8. Tang, D.M. and Dowell, E.H., ”Aeroelastic Analysis and Experiment for Wing-Store Model with Sticktion Nonlinearity,” Journal of Aircraft, Vol.48, No. 5, 2011, pp.15121530. 9. Tang, D.M. and Dowell, E.H., ”Aeroelastic Response of Aircraft with Freeplay Structural Nonlinearity,” Presented at 2nd aircraft structural design conference, Oct. 2 6-28, 2010, London. 10. Tang, D.M. and Dowell, E.H., ”Aeroelastic Response Induced by Freeplay: Part I, Theory,” AIAA Journal, Vol.49, No.11, 2011, pp. 2532-2542. 11. Tang, D.M. and Dowell, E.H., ”Aeroelastic Response Induced by Freeplay: Part II, Theoretical/Experimental Correlation Analysis” AIAA Journal Vol. 49, No.11,2011, pp.2543-2554.
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