scholarly journals Hybird Nonlinear Control for Fighter with Center of Gravity Perturbation and Aerodynamic Parameter Uncertainty

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Fuyang Chen ◽  
Cheng Qian ◽  
Yunhui Jiang ◽  
Yiwei Xu
Keyword(s):  
Nonlinear Control ◽  
Parameter Uncertainty ◽  
Center Of Gravity ◽  
Aerodynamic Parameter ◽  
Gravity Perturbation

scholarly journals Synthetic Jet Actuator-Based Aircraft Tracking Using a Continuous Robust Nonlinear Control Strategy

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
N. Ramos-Pedroza ◽  
W. MacKunis ◽  
M. Reyhanoglu
Keyword(s):  
Nonlinear Control ◽  
Trajectory Tracking ◽  
Parameter Uncertainty ◽  
Tracking Error ◽  
Synthetic Jet ◽  
Parameter Estimates ◽  
Control Law ◽  
Robust Nonlinear Control ◽  
Trajectory Tracking Control ◽  
Nonlinear Control Law

A robust nonlinear control law that achieves trajectory tracking control for unmanned aerial vehicles (UAVs) equipped with synthetic jet actuators (SJAs) is presented in this paper. A key challenge in the control design is that the dynamic characteristics of SJAs are nonlinear and contain parametric uncertainty. The challenge resulting from the uncertain SJA actuator parameters is mitigated via innovative algebraic manipulation in the tracking error system derivation along with a robust nonlinear control law employing constant SJA parameter estimates. A key contribution of the paper is a rigorous analysis of the range of SJA actuator parameter uncertainty within which asymptotic UAV trajectory tracking can be achieved. A rigorous stability analysis is carried out to prove semiglobal asymptotic trajectory tracking. Detailed simulation results are included to illustrate the effectiveness of the proposed control law in the presence of wind gusts and varying levels of SJA actuator parameter uncertainty.

Robust Nonlinear Control of Parametric Uncertain Systems With Unknown Friction and Its Application to a Pneumatic Control Valve

1997 ◽  
Vol 122 (2) ◽  
pp. 257-262 ◽  
Author(s):  
Tielong Shen ◽  
Katsutoshi Tamura ◽  
Hiroshi Kaminaga ◽  
Noriaki Henmi ◽  
Toru Nakazawa
Keyword(s):  
Nonlinear Control ◽  
Parameter Uncertainty ◽  
Uncertain Systems ◽  
Direct Method ◽  
Tracking Error ◽  
Control Valve ◽  
Robust Nonlinear Control ◽  
Pneumatic Control ◽  
Control Approach ◽  
Second Order Systems

A robust nonlinear control approach is presented for parametric uncertain systems with unknown friction. First- and second-order systems are considered, respectively. A model reference controller is developed such that the tracking error is bounded and converges to zero in the presence of the parameter uncertainty and the unknown friction. Then, the controller is extended to general case with any order. To design the controller, exact friction force is not required, only the upper bound for the level. Lyapunov’s direct method is used to prove robust global convergence of the tracking error. Finally, experimental results are given by applying the proposed controller to a pneumatic control valve. [S0022-0434(00)01802-5]

INTERVAL ANALYSIS AND NONLINEAR CONTROL OF WASTEWATER PLANTS WITH PARAMETER UNCERTAINTY

2005 ◽  
Vol 38 (1) ◽  
pp. 55-60 ◽  
Author(s):  
H. Aschemann ◽  
A. Rauh ◽  
M. Kletting ◽  
E.P. Hofer ◽  
M. Gennat ◽  
...  
Keyword(s):  
Nonlinear Control ◽  
Interval Analysis ◽  
Parameter Uncertainty

A Center of Gravity Perturbation

SIAM Review ◽  
1960 ◽  
Vol 2 (1) ◽  
pp. 41-41
Author(s):  
M. S. Klamkin
Keyword(s):  
Center Of Gravity ◽  
Gravity Perturbation

A Center of Gravity Perturbation (M. S. Klamkin)

SIAM Review ◽  
1992 ◽  
Vol 34 (4) ◽  
pp. 650-652
Author(s):  
John Quinn
Keyword(s):  
Center Of Gravity ◽  
Gravity Perturbation

Classification of Acceleration Waveforms during Walking by Wavelet Transform

1997 ◽  
Vol 36 (04/05) ◽  
pp. 356-359 ◽  
Author(s):  
M. Sekine ◽  
M. Ogawa ◽  
T. Togawa ◽  
Y. Fukui ◽  
T. Tamura
Keyword(s):  
Wavelet Transform ◽  
Wavelet Analysis ◽  
Center Of Gravity ◽  
Dynamic Responses ◽  
Sequential Data ◽  
Acceleration Signal ◽  
Continuous Dynamic

Abstract:In this study we have attempted to classify the acceleration signal, while walking both at horizontal level, and upstairs and downstairs, using wavelet analysis. The acceleration signal close to the body’s center of gravity was measured while the subjects walked in a corridor and up and down a stairway. The data for four steps were analyzed and the Daubecies 3 wavelet transform was applied to the sequential data. The variables to be discriminated were the waveforms related to levels -4 and -5. The sum of the square values at each step was compared at levels -4 and -5. Downstairs walking could be discriminated from other types of walking, showing the largest value for level -5. Walking at horizontal level was compared with upstairs walking for level -4. It was possible to discriminate the continuous dynamic responses to walking by the wavelet transform.

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