Active Flutter Suppression of the Supersonic Semispan Transport (S4T) Model

Roughen, Kevin M.; Bendiksen, Oddvar O.

doi:10.2514/6.2010-2621

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…12,14 However because of the uncertainty of the accuracy of the plant models and how well they represented the physical windtunnel model, CPE was conducted with each control law with all of the plant models at the control law design Mach number.…”

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confidence: 99%

“…They are the Doublet Lattice Method (DLM) and Wind Tunnel Based (WTB) models developed by M4 Engineering, Inc., the Finite Element Analysis (FEA) model developed by NASA and the ZONA Aerodynamics (ZAERO) and ZONA Euler Unsteady Solver (ZEUS) models developed by Zona Technologies. M4 Engineering[12][13] and Zona Technologies 14-16 were NASA Research Announcement (NRA) partners working under contract to develop control laws for the S 4 T. M4 updated the finite element model incorporating data from early wind-off stress and loads tests to improve the finite element model. The WTB model had the frequencies tuned to GVT tests.…”

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confidence: 99%

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Analytical and Experimental Evaluation of Digital Control Systems for the Semi-Span Super-Sonic Transport (S4T) Project

Wieseman¹,

Christhilf²,

Perry³

2012

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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An important objective of the Semi-Span Super-Sonic Transport (S 4 T) wind tunnel model program was the demonstration of Flutter Suppression (FS), Gust Load Alleviation (GLA), and Ride Quality Enhancement (RQE). It was critical to evaluate the stability and robustness of these control laws analytically before testing them and experimentally while testing them to ensure safety of the model and the wind tunnel. MATLAB based software was applied to evaluate the performance of closed-loop systems in terms of stability and robustness. Existing software tools were extended to use analytical representations of the S 4 T and the control laws to analyze and evaluate the control laws prior to testing. Lessons were learned about the complex windtunnel model and experimental testing. The open-loop flutter boundary was determined from the closed-loop systems. A MATLAB/Simulink Simulation developed under the program is available for future work to improve the CPE process. This paper is one of a series of that comprise a special session, which summarizes the S 4 T wind-tunnel program. Nomenclature CLO = control law output CPE = controller performance evaluation FRF = frequency response function or frequency responses det = determinant G = open-loop plant FLAP = wing trailing edge control surface FLAPCOM = command to FLAP FLAPEXC = excitation to FLAP HT = horizontal tail HTCOM = command to HT HTEXC = excitation to HT IBMID15I = accelerometer located on the inboard middle section of the wing LTI = linear time invariant state-space representation of a system. MIMO = multi-input multi-output NIBAFTZ = nacelle inboard aft accelerometer in the z direction ! = dynamic pressure, psf RCV = ride control vane SISO = single-input single-output ! ! = time history of ith excitation to control surface ! ! = time history of ith control law output ! ! = time history of ith plant output ! ! = matrix of frequency responses of control law outputs to excitations ! ! = matrix of frequency responses of plant outputs to excitations σ = singular value Subscripts f = flutter

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Analytical and Experimental Evaluation of Digital Control Systems for the Semi-Span Super-Sonic Transport (S4T) Project
Wieseman¹,
Christhilf²,
Perry³
2012
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
3
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5
0
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“…[8][9][10] For some of the models, modifications were made to the FEM to adjust wind-off frequencies to better match S 4 T experimental data. 11 These linear state-space models were used for control law design. Metrics were established for design and evaluation of each type of control law (RQE, GLA, FS).…”

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confidence: 99%

Characteristics of Control Laws Tested on the Semi-Span Super-Sonic Transport (S4T) Wind-Tunnel Model
Christhilf¹,
Moulin²,
Ritz³
et al. 2012
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials ConferenceSelf Cite
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“…14,15,16,17 As a guide to the reader, figure 2 gives a representation of the events leading to the design and testing of the S 4 T-ACT. The development of this model, with particular focus on the lessons learned during the design and testing process, are the focus of this paper.…”

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confidence: 99%

Lessons in the Design and Characterization Testing of the Semi-Span Super-Sonic Transport (S4T) Wind-Tunnel Model
Florance¹,
Scott²,
Keller³
et al. 2012
53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
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Active Flutter Suppression of the Supersonic Semispan Transport (S4T) Model

Cited by 4 publications

References 15 publications

Analytical and Experimental Evaluation of Digital Control Systems for the Semi-Span Super-Sonic Transport (S4T) Project

Analytical and Experimental Evaluation of Digital Control Systems for the Semi-Span Super-Sonic Transport (S4T) Project

Characteristics of Control Laws Tested on the Semi-Span Super-Sonic Transport (S4T) Wind-Tunnel Model

Lessons in the Design and Characterization Testing of the Semi-Span Super-Sonic Transport (S4T) Wind-Tunnel Model

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