Nonlinear robustness analysis of flight control laws for highly augmented aircraft

2007 ◽  
Vol 15 (6) ◽  
pp. 655-662 ◽  
Author(s):  
Prathyush P. Menon ◽  
Declan G. Bates ◽  
Ian Postlethwaite
Keyword(s):  
Flight Control ◽  
Robustness Analysis ◽  
Control Laws

ROBUSTNESS ANALYSIS OF NONLINEAR FLIGHT CONTROL LAWS OVER CONTINUOUS REGIONS OF THE FLIGHT ENVELOPE

2006 ◽  
Vol 39 (9) ◽  
pp. 53-58 ◽  
Author(s):  
Prathyush P. Menon ◽  
Declan G. Bates ◽  
Ian Postlethwaite
Keyword(s):  
Flight Control ◽  
Robustness Analysis ◽  
Control Laws ◽  
Flight Envelope

Robustness Analysis of Two Advanced Flight Control Laws: NDI and INDI

2021 ◽  
pp. 660-668
Author(s):  
Fei Luo ◽  
Junhong Zhang ◽  
Biao Jiang
Keyword(s):  
Flight Control ◽  
Robustness Analysis ◽  
Control Laws

A NOVEL METHOD FOR FLIGHT CONTROL LAWS ROBUSTNESS ANALYSIS OVER UNSTEADY TRAJECTORIES

2007 ◽  
Vol 40 (7) ◽  
pp. 347-352 ◽  
Author(s):  
U. Tancredi ◽  
M. Grassi ◽  
F. Corraro ◽  
E. Filippone ◽  
R. Palumbo ◽  
...  
Keyword(s):  
Flight Control ◽  
Robustness Analysis ◽  
Control Laws ◽  
Novel Method

String Instabilities in Formation Flight: Limitations Due to Integral Constraints

2004 ◽  
Vol 126 (4) ◽  
pp. 873-879 ◽  
Author(s):  
P. Seiler ◽  
A. Pant ◽  
J. K. Hedrick
Keyword(s):  
Flight Control ◽  
Formation Control ◽  
Energy Savings ◽  
Feedback Loops ◽  
Formation Flight ◽  
Control Laws ◽  
Aerodynamic Efficiency ◽  
Preceding Vehicle ◽  
Specific Control ◽  
Theoretical Results

Flying in formation improves aerodynamic efficiency and, consequently, leads to an energy savings. One strategy for formation control is to follow the preceding vehicle. Many researchers have shown through simulation results and analysis of specific control laws that this strategy leads to amplification of disturbances as they propagate through the formation. This effect is known as string instability. In this paper, we show that string instability is due to a fundamental constraint on coupled feedback loops. The tradeoffs imposed by this constraint imply that predecessor following is an inherently poor strategy for formation flight control. Finally, we present two examples that demonstrate the theoretical results.

Automatic Flight Control of Unmanned Helicopter Based on Nonlinear Model

2012 ◽  
Vol 472-475 ◽  
pp. 1492-1499
Author(s):  
Run Xia Guo
Keyword(s):  
Nonlinear Model ◽  
Flight Control ◽  
Attitude Control ◽  
Lyapunov Stability Theory ◽  
Test Results ◽  
Unmanned Helicopter ◽  
Control Laws ◽  
Control Approach ◽  
State Dependent ◽  
Compensation Technique

The Unmanned helicopter (UMH) movement was divided into two parts, namely, attitude and trajectory motion. And then a two-timescale nonlinear model was established. The paper improved and expanded state dependent riccati equation (SDRE) control approach, deriving analytical conditions for achieving global asymptotic stability with lyapunov stability theory. Proof was given. By combining improved SDRE control with nonlinear feed-forward compensation technique, the full envelop flight attitude control laws could be designed. On the basis of attitude control, trajectory controller was developed. Actual flight tests were carried out. Test results show that the control strategy is highly effective.

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