Analysis of the Two-Degree-of-Freedom Wing Rock in Advanced Aircraft

Go, Tiauw Hiong; Ramnath, Rudrapatna V.

doi:10.2514/2.4885

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…As such, a traditional frequency-domain analysis indicates a broadband behavior by noting the bounds, whereas a time-frequency analysis indicates the narrowband behavior by noting the localized properties at instantaneous times. The cause of such variation in frequency with time is unknown; however, some amount of variation would be expected if the underlying dynamics associated with wing rock are indeed nonlinear, so that any response depends on the phase-plane characteristics along with the initial conditions for the LCO [6][7][8][9][10].…”

Section: Parametrizationmentioning

confidence: 99%

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Characterizing Wing Rock with Variations in Size and Configuration of Vertical Tail

Johnson

Lind

2010

Journal of Aircraft

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Flight at high angle-of-attack conditions, which range beyond wing stall, has numerous advantages for mission performance; however, that flight regime is often affected by adverse behaviors. A particularly notable behavior is associated with uncommanded oscillations primarily about the roll axis and is known as wing rock. This paper investigates wing rock for a small, propeller-powered aerobatic unmanned aerial vehicle with a high degree of vertical symmetry flown at high angle-of-attack conditions. Most importantly, the investigation characterizes the nature of wing rock as a function of size and configuration of the vertical tail. The flight data indicate that wing rock is dependent on the configuration but not on the size of the vertical tail: wing rock oscillations are present for upright but not inverted regardless of vertical tail size. Furthermore, a time-frequency analysis indicates that the wing rock is actually a narrowband phenomenon for which the central frequency varies with time.

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Section: Parametrizationmentioning

confidence: 99%

“…Some research has led to the belief that the wing rock phenomenon is a limit cycle oscillation (LCO) caused either by the loss of dynamic roll damping at high angles-of-attack [6,7] or an aerodynamic hysteresis that generates the springlike forces required to drive the LCO [8][9][10].…”

mentioning

confidence: 99%

Characterizing Wing Rock with Variations in Size and Configuration of Vertical Tail

Johnson

Lind

2010

Journal of Aircraft

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“…The wing-rock dynamics has been investigated both numerically and analytically [18]. The asymptotical techniques have been applied in [4,7]. A set of methods for wing-rock control have been proposed, namely, direct adaptive control [5], nonlinear H ∞ -method [6], NN adaptive control [5,8], and others.…”

Section: Introductionmentioning

confidence: 99%

Neural network adaptive control of wing-rock motion of aircraft model mounted on three-degree-of-freedom dynamic rig in wind tunnel

Ignatyev

2018

Progress in Flight Dynamics, Guidance, Navigation, and Control – Volume 10

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High-angles-of-attack dynamics of aircraft are complicated with dangerous phenomena such as wing rock, stall, and spin. Autonomous dynamically scaled aircraft model mounted in three-degree-of-freedom (3DoF) dynamic rig is proposed for studying aircraft dynamics and prototyping of control laws in wind tunnel. Dynamics of the scaled aircraft model in 3DoF manoeuvre rig in wind tunnel is considered. The model limit-cycle oscillations are obtained at high angles of attack. A neural network (NN) adaptive control suppressing wing rock motion is designed. The wing rock suppression with the proposed control law is validated using nonlinear time-domain simulations.

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“…Mathematically, three possible nonlinear factors were considered as the inducements of the wing rock phenomenon, which are the variation of damping in roll with angle of sideslip, cubic variation of lateral derivatives with roll rate and sideslip, and the aerodynamic hysteresis in steady-state rolling moment [1,2]. Meanwhile, different wing-rock models have been developed [3][4][5][6]. Based on these simplified models, many control schemes were developed to suppress the influence of wing rock.…”

Section: Introductionmentioning

confidence: 99%

Robust Backstepping Control of Wing Rock Using Disturbance Observer

Gong

2017

Applied Sciences

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Wing rock is a highly nonlinear phenomenon when the aircraft suffers undesired roll-dominated oscillatory at high angle of attack (AOA). Considering the strong nonlinear and unsteady aerodynamic characteristics, an uncertain multi-input and multi-output (MIMO) nonlinear wing rock model is studied, and system uncertainties, unsteady aerodynamic disturbances and external disturbances are considered in the design of wing rock control law. To handle the problem of multiple disturbances, a robust control scheme is proposed based on the extended state observer (ESO) and the radial basis function neural network (RBFNN) technique. Considering that the effectiveness of actuators are greatly decreased at high AOA, the input saturation problem is also handled by constructing a corresponding auxiliary system. Based on the improved ESO and the auxiliary system, a robust backstepping control law is proposed for the wing rock control. In addition, the dynamic surface control (DSC) technique is introduced to avoid the tedious computations of time derivatives for the virtual control laws in the backstepping method. The stability of the closed-loop system is guaranteed via rigorously Lyapunov analysis. Finally, simulation results are presented to illustrate the effectiveness of the ESO and the proposed wing rock control approach.

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Analysis of the Two-Degree-of-Freedom Wing Rock in Advanced Aircraft

Cited by 21 publications

References 11 publications

Characterizing Wing Rock with Variations in Size and Configuration of Vertical Tail

Characterizing Wing Rock with Variations in Size and Configuration of Vertical Tail

Neural network adaptive control of wing-rock motion of aircraft model mounted on three-degree-of-freedom dynamic rig in wind tunnel

Robust Backstepping Control of Wing Rock Using Disturbance Observer

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