Prediction of Jump Phenomena in Roll-Coupled Maneuvers of Airplanes

Schy, A. A.; Hannah, Margery E

doi:10.2514/3.58787

Cited by 55 publications

(23 citation statements)

References 2 publications

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“…The classical roll-coupling problem has been studied in a number of papers (4,5,6,11,12,18) and the general dynamical system is described by five differential equations. To illustrate the application of algebraic methods for stability analysis, we first recall the simplified model (4) of the roll-coupling problem described by three differential equations of the form…”

Section: Simplified Roll-coupling Modelmentioning

confidence: 99%

Algebraic analysis of stability and bifurcation for nonlinear flight dynamics

Wang

2011

Aeronaut. j.

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Section: Simplified Roll-coupling Modelmentioning

confidence: 99%

Algebraic analysis of stability and bifurcation for nonlinear flight dynamics

Wang

2011

Aeronaut. j.

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“…The computational burden of the analysis also restricts the polynomial degree to be less than or equal to 3. Hence, a six state cubic polynomial model of the F/A-18 aircraft for roll-coupled maneuvers 18 is used in this paper for performing all the analyses. The reduced (open loop cubic polynomial) equations of motion are presented in the Appendix B.…”

Section: Reduced Equations Of Motionmentioning

confidence: 99%

“…Roll-coupled maneuvers 18 of the aircraft are the focus of the analysis. The velocity, V T , is assumed to be constant and equal to 250 ft/s.α…”

Section: Reduced Equations Of Motionmentioning

confidence: 99%

Applications of Linear and Nonlinear Robustness Analysis Techniques to the F/A-18 Flight Control Laws

Chakraborty

Seiler

Balas

2009

AIAA Guidance, Navigation, and Control Conference

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The F/A-18 Hornet aircraft with the original flight control law exhibited an out-ofcontrol phenomenon known as the falling leaf mode. Several aircraft were lost due to the falling leaf mode and which led NAVAIR and Boeing to redesign the flight control law. The revised flight control law successfully suppressed the falling leaf mode during flight tests with aggressive maneuvers. This paper compares the robustness of the original (baseline) and revised control laws using linear analyses, Monte Carlo simulations, and nonlinear region-of-attraction analyses. The linear analyses indicate the revised controller only marginally improves the closed-loop robustness while the nonlinear analyses indicate a substantial improvement in robustness over the baseline controller. This example demonstrates the potential for nonlinear analyses to detect out-of-control phenomenon that are not evident from linear analyses.

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“…Instabilities in inertia-coupled roll maneuvers of aircraft, discovered by Phillips, 54 were attributed to a jump phenomenon by Gates and Minka. 22 Schy and Hannah 64 were the first to computationally predict the critical control inputs at which jump would occur, using a reduced set of equations of motion (see Appendix B). They computed approximate steady states for an airplane in rolling motion, called pseudosteady states (PSS), by neglecting the effect of gravity in the equations in Appendix B.…”

Section: B Inertia-coupled Roll Maneuversmentioning

confidence: 99%

Use of Bifurcation and Continuation Methods for Aircraft Trim and Stability Analysis - A State-of-the-Art

Paranjape

Sinha

Ananthkrishnan

2007

45th AIAA Aerospace Sciences Meeting and Exhibit

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The bifurcation and continuation methodology has evolved over the last two decades into a powerful tool for the analysis of trim and stability problems in aircraft flight dynamics. Over the years, bifurcation methods have been employed to deal with a variety of problems in aircraft dynamics, such as predicting high angle of attack behavior, especially spin, and studying instabilities in rolling maneuvers. The bifurcation methodology has served as a tool for the design of flight control systems, and is promising to be a useful tool in the aircraft design, simulation, testing, and evaluation process. In the present paper, we describe the state-of-the-art in the use of bifurcation and continuation methods for the analysis of aircraft trim and stability with a few illustrative examples. Both the standard and extended bifurcation analysis procedures are discussed and typical results for instabilities in high-α flight and in inertia-coupled roll maneuvers are shown. This is followed by several problems in nonlinear flight dynamics where bifurcation and continuation methods have been fruitfully applied to yield effective solutions. Finally, the use of bifurcation theory to arrive at analytical instability criteria is demonstrated for the aircraft roll coupling and wing rock problems. 76 references have been cited in the text.

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Prediction of Jump Phenomena in Roll-Coupled Maneuvers of Airplanes

Cited by 55 publications

References 2 publications

Algebraic analysis of stability and bifurcation for nonlinear flight dynamics

Algebraic analysis of stability and bifurcation for nonlinear flight dynamics

Applications of Linear and Nonlinear Robustness Analysis Techniques to the F/A-18 Flight Control Laws

Use of Bifurcation and Continuation Methods for Aircraft Trim and Stability Analysis - A State-of-the-Art

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