Accession Number:

ADA516389

Title:

Feedback Flow Control for a Pitching Turret (Part I) (POSTPRINT)

Descriptive Note:

Conference paper postprint 7 Apr 2008-23 Nov 2009

Corporate Author:

CLEAR SCIENCE CORP HARFORD NY

Personal Author(s):

• Vaithianathan, T.
• Carlson, H. A.
• Wallace, R. D.
• Shea, P. R.
• Glauser, M. N.

Report Date:

2010-01-01

Pagination or Media Count:

16.0

Abstract:

Closed-loop systems have been developed for controlling the flow above a three-dimensional turret. The top of the turret is hemispherical, houses a flat optical aperture, and can rotate about two axes pitch and yaw. The extent of separation and concomitant turbulence levels in the flow above the aperture change as the turret rotates. The control objective is to minimize the separation and turbulence in the dynamic environment created by the articulating turret. The closed-loop control systems include dynamical and measurement-based estimators, regulators, filters, and compensators. These components are developed using both computational data from CFD simulations and experimental data from wind tunnel runs within the common framework of SMARTflow - engineering software for flow control system design. The control systems are evaluated through a series of control-in-the-loop CFD simulations and wind tunnel runs, demonstrating the merits of feedback control through robustness in the presence of measurement noise, modeling errors, and highly unsteady conditions and through reductions in actuation energy below levels required by open-loop systems. Controller designs and computational tests are described here wind tunnel tests are described in the companion paper.

Descriptors:

• *FEEDBACK
• *CLOSED LOOP SYSTEMS
• *YAW
• *PITCH(MOTION)
• *COMPUTATIONAL FLUID DYNAMICS
• *AIRCRAFT TURRETS
• ENVIRONMENTS
• MODELS
• DYNAMICS
• TURBULENCE
• THREE DIMENSIONAL
• ENGINEERING
• ERRORS
• AXES
• WIND TUNNEL TESTS
• FLOW
• NOISE
• ENERGY LEVELS
• OPEN LOOP SYSTEMS
• WIND TUNNELS
• ACTUATION
• COMPENSATORS
• COMPUTATIONS
• CONTROL SYSTEMS
• EXPERIMENTAL DATA
• MEASUREMENT
• CONTROL
• TEST AND EVALUATION
• COMPUTER PROGRAMS

Subject Categories:

• Aerodynamics
• Test Facilities, Equipment and Methods
• Logistics, Military Facilities and Supplies
• Miscellaneous Detection and Detectors
• Fluid Mechanics
• Command, Control and Communications Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE