Classic and Robust Aeroservoelastic Control for the S4T Wind-Tunnel Model

Adaptive Flutter Suppression for a Fighter Wing via Recurrent Neural Networks over a Wide Transonic Range

“…Aeroelastic instability, induced by the interaction of unsteady aerodynamics and structural dynamics, is a disaster for any flight vehicles. Hence, recent years have witnessed a great number of studies, both numerical and experimental ones, on the design of aeroelastic control systems [1][2][3][4][5]. For example, Mukhopadhyay synthesized a flutter suppression controller for the active flexible wing model by using the linear quadratic Gaussian theory [1].…”

“…Then, Zhao proposed a flutter suppression controller for the aeroelastic system with input time delay in control loop via the ∞ control theory [3]. Afterwards, Moulin et al studied the classic and robust controllers [4] and Zeng et al studied an experimental model-based feedbackcontrol framework [5] for flutter suppression and gust load alleviation of the supersonic semispan transport wind-tunnel model. An active flutter controller should work well over a range of flight conditions since the flight parameters, such as flight velocity and Mach number, are always subject to variations during a flight.…”

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

“…Results from the third wind-tunnel test for the RQE and GLA metrics have been published previously. 12,13 …”

“…13 The term Robust refers to either H-infinity or µ-synthesis design, and the techniques produce compensators that provide guaranteed stability for the closed-loop system, provided that the deviations from the design case are bounded by the level of uncertainty assumed during the design process. The Classic approach can refer to such things as Evans (gain) Root Locus, Bode, Nyquist, or Nichols design techniques for linear systems.…”

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

“…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.…”