Disturbance observer based control for gust alleviation of a small fixed-wing UAS

Smith, Jean; Liu, Cunjia; Chen, Wenhua

doi:10.1109/icuas.2016.7502575

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…The combination of an observer-based feedback with LQI has yielded good results for guidance and navigation applications in UAVs. For instance, in Smith et al (2016), the effects of the wind gusts were reduced in a significant manner.…”

Section: Direct-thrust Linear Quadratic Integral Controllermentioning

confidence: 99%

Turbojet direct-thrust control scheme for full-envelope fuel consumption minimization

Villarreal-Valderrama

Delgado

Zambrano‐Robledo

et al. 2020

AEAT

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Purpose Reducing fuel consumption of unmanned aerial vehicles (UAVs) during transient operation is a cornerstone to achieve environment-friendly operations. The purpose of this paper is to develop a control scheme that improves the fuel economy of a turbojet in its full operating envelope. Design/methodology/approach A novel direct-thrust linear quadratic integral (LQI) approach, comprised by an optimal observer/controller satisfying specified performance parameters, is presented. The thrust estimator, based in a Wiener model, is validated with the experimental data of a micro-turbojet. Model uncertainty is characterized by analyzing variations between the identified model and measured data. The resulting uncertainty range is used to verify closed-loop stability with the circle criterion. The proposed controller provides stable responses with the specified performance in the whole operating range, even with after considering plant nonlinearities. Finally, the direct-thrust LQI is compared with a standard thrust controller to assess fuel economy and performance. Findings The direct-thrust LQI approach reduced the fuel consumption by 2.1090% in the most realistic scenario. The controllers were also evaluated using the environmental effect parameter (EEP) and transient-thrust-specific fuel consumption (T-TSFC). These novel metrics are proposed to evaluate the environmental impact during transient-thrust operations. The direct-thrust LQI approach has a more efficient fuel consumption according to these metrics. The results also show that isolating the thrust dynamics within the feedback loop has an important impact in fuel economy. Controllers were also evaluated using the EEP and T-TSFC. These novel metrics are proposed to evaluate the environmental impact during transient-thrust operations. The direct-thrust LQI approach has a more efficient fuel consumption according to these metrics. The results also show that isolating the thrust dynamics within the feedback loop has an important impact in fuel economy. Originality/value This study shows the design of an effective direct-thrust control approach that minimizes fuel consumption, ensures stable responses for the full operation range, allows isolating the thrust dynamics when designing the controller and is compatible with classical robustness and performance metrics. Finally, the study shows that a simple controller can reduce the fuel consumption of the turbojet during transient operation in scenarios that approximate realistic operating conditions.

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Section: Direct-thrust Linear Quadratic Integral Controllermentioning

confidence: 99%

Turbojet direct-thrust control scheme for full-envelope fuel consumption minimization

Villarreal-Valderrama

Delgado

Zambrano‐Robledo

et al. 2020

AEAT

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“…In this work, the classic static anti-windup [20] is exploited. This work is a continuation of the work published previously [2], aiming to further develop the technique toward the landing control problem.…”

Section: Introductionmentioning

confidence: 95%

“…Although improvement was demonstrated, the effect of the disturbance was not completely removed from the output. DOBC has the ability to reject both internal and external disturbances, and has been applied to small UAV control [2]. Rejecting internal disturbances means modelling uncertainty, which is likely for small UAVs, is accounted for.…”

Section: Introductionmentioning

confidence: 99%

“…This work is concerned with fixed-wing UAVs, which are generally operated outdoors. Operating outdoors exposes the aircraft to environmental disturbances such as wind gusts [2]. This is a challenge which has been studied since the very beginning of aviation [3] and many modern aircraft are fitted with Gust Load Alleviation (GLA) systems [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Disturbance Observer Based Control with Anti-Windup Applied to a Small Fixed Wing UAV for Disturbance Rejection

Smith

Liu

2017

J Intell Robot Syst

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Small Unmanned Aerial Vehicles (UAVs) are attracting increasing interest due to their favourable features; small size, low weight and cost. These features also present different challenges in control design and aircraft operation. An accurate mathematical model is unlikely to be available meaning optimal control methods become difficult to apply. Furthermore, their reduced weight and inertia mean they are significantly more vulnerable to environmental disturbances such as wind gusts. Larger disturbances require more control actuation, meaning small UAVs are far more susceptible to actuator saturation. Failure to account for this can lead to controller windup and subsequent performance degradation. In this work, numerical simulations are conducted comparing a baseline Linear Quadratic Regulator (LQR) controller to integral augmentation and Disturbance Observer Based Control (DOBC). An anti-windup scheme is added to the DOBC to attenuate windup The simulations conduct manoeuvres which would occur during landing, statistically the most dangerous flight phase, where fast disturbance rejection is critical. Validation simulations are then conducted using commercial X-Plane simulation software. This demonstrates that DOBC with anti-windup provides faster disturbance rejection of both modelling errors and external disturbances.

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“…Those subjects have been addressed by many researchers working on unmanned aerial vehicles (UAVs) -especially within several contexts such as the control algorithms [1], [9], optimization of the UAV's construction [3] or ensuring fault-tolerant control [20]. Many of those solutions are inspired on ideas used for fixed-wing UAVs [7], [27].…”

Section: Introductionmentioning

confidence: 99%

Rotational speed control of multirotor UAV's propulsion unit based on fractional-order PI controller

Giernacki

Sadalla

Gośliński

et al. 2017

2017 22nd International Conference on Methods and Models in Automation and Robotics (MMAR)

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Disturbance observer based control for gust alleviation of a small fixed-wing UAS

Cited by 9 publications

References 15 publications

Turbojet direct-thrust control scheme for full-envelope fuel consumption minimization

Turbojet direct-thrust control scheme for full-envelope fuel consumption minimization

Disturbance Observer Based Control with Anti-Windup Applied to a Small Fixed Wing UAV for Disturbance Rejection

Rotational speed control of multirotor UAV's propulsion unit based on fractional-order PI controller

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