Mixed adaptive control architecture for a novel coaxial-ducted-fan aircraft under time-varying uncertainties

Fan, Wei; Chen, Xiang; Najjaran, Homayoun; Wang, Xiaoliang; Xu, Bugong

doi:10.1016/j.ast.2018.02.013

Cited by 18 publications

(6 citation statements)

References 16 publications

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“…The experiments are conducted at the Vehicle Research Center of BIT (Beijing Institute of Technology). There are a variety of SR vehicles 10,11,[38][39][40][41] developed successfully in the laboratory. In our past work, 10 the test model is mounted vertically and reversely on a test bench (0.3 m 3 0.3 m 3 1.2 m) so that the air flows from bottom to top.…”

Section: Methodsmentioning

confidence: 99%

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Han

Chen

et al. 2019

Advances in Mechanical Engineering

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The aerodynamic characteristics of open rotor hovering in confined environment are extensively studied, but few papers focus on shrouded rotor. In order to study aerodynamic performance and flowfield characteristics of micro-scale shrouded rotor hovering in confined environment, experimental measurements and computational fluid dynamic simulations are conducted in this article. Three cases of confined planes including ground, ceiling, and wall close to shrouded rotor are studied successively. Another case of no confined planes around shrouded rotor is also researched. Results show that both ground and ceiling improve the aerodynamic performance of shrouded rotor at distance below 1.5 rotor radii with the enhanced figure of merit, while wall plane influences flight stability because of the unbalanced moment. The experimental data reveal that the performance of shrouded rotor in-ground effect is more sensitive than that of shrouded rotor in-ceiling effect. However, for in-ground effect or in-ceiling effect, the performance of shrouded rotor is more sensitive than that of open rotor. Flowfield analysis by computational fluid dynamic shows the confined planes block airflow around shrouded rotor. Tip flow leakage and flow separation occur near shroud lip when shrouded rotor is hovering considerably close to ground or ceiling. Turbulent vortices and fluctuating velocities affect the flight stability of shrouded rotor.

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Section: Methodsmentioning

confidence: 99%

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Han

Chen

et al. 2019

Advances in Mechanical Engineering

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“…Usually, the system uncertainty is defined as unknown disturbance or as unknown input. In the existing work [15,16,17,31,32], system uncertainties and external disturbances are bounded by some scalars, without more detailed expressions. In order to better enhance the robustness of the proposed control method to system uncertainties, crosswind disturbances and other non-linear disturbances, the research should be basically developed on a control-oriented model.…”

Section: Problem Formulationmentioning

confidence: 99%

Dynamic observer‐basedH∞ robust control for a ducted coaxial‐rotor UAV

2022

IET Control Theory & Appl

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“…27,28 Modern adaptive controllers have gained notable attentions in dynamical systems. 29–34 As well, various applications of MRAC with integral feedback are reported. 22,35,36 The idea of the method is based on adding the adaptation to a baseline state feedback controller.…”

Section: Design Of Composite Adaptive Posicast Controllermentioning

confidence: 99%

“…27,28 Modern adaptive controllers have gained notable attentions in dynamical systems. [29][30][31][32][33][34] As well, various applications of MRAC with integral feedback are reported. 22,35,36 The idea of the method is based on adding the adaptation to 25 0:00543 À 0:01426 0:41336 À 0:00465 0:00263 30 0:00657 À 0:02040 0:38008 À 0:00537 0:02596 32:5 0:00732 À 0:03104 0:53884 À 0:00623 0:04189 35 0:00794 À 0:03137 0:53455 À 0:00751 0:05144 40 0:00902 À 0:01881 0:62351 À 0:01187 0:06119 AOA: angle of attack.…”

Section: Design Of Composite Adaptive Posicast Controllermentioning

confidence: 99%

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Composite adaptive posicast controller for the wing rock phenomenon in a delta-wing aircraft

Yousefimanesh

Khosravi

Sarhadi

2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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The nonlinear dynamic phenomenon like wing rock is one of the important issues in the high performance aircraft autopilot design. This phenomenon occurs in the form of constant amplitude oscillations in the roll dynamics, during the flight at high angles of attack (AOAs) and endangers carrying out the mission of an aircraft. In this paper, a composite adaptive posicast controller is designed for the wing rock phenomenon in a delta-wing aircraft with known input delay. The existence of the input delay besides the parametric uncertainties of the system dynamics adds to the complexity of the problem and can cause undesirable troubles in regulation and tracking performance or instability in the control system. Consequently, there is a need for a controller that can provide the stability and desirable regulation and tracking for the system. The proposed control method uses the system state forecasting and the composite model reference adaptive controller in an integrated control structure based on linear quadratic regulator (LQR). Combining the tracking error and the prediction error to form the adaptive laws in the composite model reference adaptive controller improves the characteristics of the system response and provides a better performance compared to the model reference adaptive controller in which the adaptive laws are formed only with the tracking error. Simulation results show the efficiency of the composite adaptive posicast controller in counteracting the system uncertainties in the presence of considerably large input delay cases.

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Mixed adaptive control architecture for a novel coaxial-ducted-fan aircraft under time-varying uncertainties

Cited by 18 publications

References 16 publications

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Dynamic observer‐basedH∞ robust control for a ducted coaxial‐rotor UAV

Composite adaptive posicast controller for the wing rock phenomenon in a delta-wing aircraft

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