This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Aircraft Control Using Stagnation Point Displacement
Annotation ability available
Sector:
Language:
English
Abstract
A Stagnation Point Actuator is used to control the lateral dynamics of vortices generated over a sharp-pointed forebody, at high angles of attack, and the resulting rolling moment is studied. Effective roll control is demonstrated, including the ability to suppress the wing rock phenomenon. Piecewise-linear transfer functions are developed from experimental data for the changes in roll moment and pressure difference with actuator frequency content. These transfer functions are reduced to compact form in the frequency domain, and then to a time-domain model using 2 gains and 2 time scales. The roll response is classified according to angle of attack range. Some long time scales are observed in the surface pressure, velocity field and rolling moment, making the response relatively insensitive to speed. Thus over substantial speed ranges, linear transfer functions are shown to effectively describe the roll response to motion of the Stagnation Point Actuator. While much remains to be learned about vortex response, simple empirical approaches are thus shown to hold promise in developing controllers, when combined with adaptive control systems.
Authors
Citation
Darden, L. and Komerath, N., "Aircraft Control Using Stagnation Point Displacement," SAE Technical Paper 975590, 1997, https://doi.org/10.4271/975590.Also In
References
- Darden, L.A. Komerath, N.M. “Forebody Vortex Control At High Incidence Using A Moveable Nose Stagnation Point” June 1995
- Darden, L.A. Peterson, K.G. Komerath, N.M. “Vortex Control Using a Moveable Nose with Pressure Feedback” August 1995
- Peterson, K.G. Darden, L.A. Komerath, N.M. “Dynamic Roll Control Experiments Using a Movable Nosetip” January 1996
- Darden, L.A. Peterson, K.G. Komerath, N.M. “Roll Control Using a Stagnation Point Actuator” June 1996
- Brandon, J.M. Nguyen, L. T. “Experimental Study of Effects of Forebody Geometry on High Angle-of-Attack Stability” Journal of Aircraft 25 7 July 1988 591 597
- Huang, X.Z. Hanff, E.S. Jenkins, J.E. Addington, G. “Leading-Edge Vortex Behavior on a 65-degree Delta Wing Oscillating in Roll” August 1994
- Ericsson, L.E. Reding, J.P. “Asymmetric Vortex Shedding from Bodies of Revolution” Tactical Missile Aerodynamics 104 243 296
- Jenkins, J.E. Hanff, E.S. “Highlights of the IAR/WL Delta Wing Program” Proceedings of Workshop III: Delta Wings, Unsteady Aerodynamics and Modeling Baltimore Aug. 95
- Hall, R. “Influence of Forebody Cross-Sectional Shape on Wing Vortex-Burst Location,” Journal of Aircraft 24 9 1987 645 652
- Jenkins, J. “Nonlinear Aerodynamic Characteristics of a 65 Degree Delta Wing in Rolling Motion: Implications to Testing and Flight Mechanics Analysis” January 1997
- Moskovitz, C. Hall, R. Dejarnette, F. “Experimental Investigation of a New Device to Control the Asymmetric Flowfield on Forebodies at Large Angles of Attack” January '90
- Bridges, D.H. Hornung, H.G. “Elliptic Tip Effects on the Vortex Wake of an Axisymmetric Body at Incidence” AIAA Journal 32 7 July 1992 1437 1445
- Darden, L.A. Komerath, N.M. “Transfer Function Analysis of Roll Moment Response to Stagnation Point Actuation” 15th Applied Aerodynamics Conference June '97
- Darden, L.A. Villarreal, L. Komerath, N.M. “Time Scales of Forebody Vortex Response” 4th AIAA Shear Flow Control Conference June-July 1997
- Lanser, W.R. Meyn, L.A. “Forebody Flow Control on a Full-Scale F/A - 18 Aircraft” Journal of Aircraft 31 6 Nov. - Dec. 1994 1365 1371
- Arena, A.S. Nelson, R.C. Schiff, L.B. “Directional Control at High Angles of Attack Using Blowing Through a Chined Forebody” Journal of Aircraft 32 3 May - June 1995 596 602
- Pedreiro, N. Rock, S.M. Celik, Z.Z. Roberts, L. “Roll-Yaw Control at High Angle of Attack by Forebody Tangential Blowing” 34th Aerospace Sciences Meeting January 1996
- Ng, T.T. Malcolm, G.N. “Aerodynamic Control Using Forebody Blowing and Suction” 29th Aerospace Sciences Meeting January 1991
- Ng, T.T. Malcolm, G.N. “Aerodynamic Control Using Forebody Strakes” 29th Aerospace Sciences Meeting January 1991