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Parameter Estimation of Actuators for Benchmark Active Control Technology (BACT) Wind Tunnel Model with Analysis of Wear and Aerodynamic Loading EffectsThis report describes the development of transfer function models for the trailing-edge and upper and lower spoiler actuators of the Benchmark Active Control Technology (BACT) wind tunnel model for application to control system analysis and design. A simple nonlinear least-squares parameter estimation approach is applied to determine transfer function parameters from frequency response data. Unconstrained quasi-Newton minimization of weighted frequency response error was employed to estimate the transfer function parameters. An analysis of the behavior of the actuators over time to assess the effects of wear and aerodynamic load by using the transfer function models is also presented. The frequency responses indicate consistent actuator behavior throughout the wind tunnel test and only slight degradation in effectiveness due to aerodynamic hinge loading. The resulting actuator models have been used in design, analysis, and simulation of controllers for the BACT to successfully suppress flutter over a wide range of conditions.
Document ID
19980211327
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
Authors
Waszak, Martin R. (NASA Langley Research Center Hampton, VA United States)
Fung, Jimmy (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1998
Subject Category
Aircraft Stability And Control
Report/Patent Number
L-17540
NASA/TM-1998-208452
NAS 1.15:208452
AIAA Paper 96-3362
Report Number: L-17540
Report Number: NASA/TM-1998-208452
Report Number: NAS 1.15:208452
Report Number: AIAA Paper 96-3362
Meeting Information
Meeting: Atmospheric Flight Mechanics Conference
Location: San Diego, CA
Country: United States
Start Date: July 29, 1996
End Date: July 31, 1996
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
PROJECT: RTOP 505-64-52-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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