Adaptive attitude controller for a satellite based on neural network in the presence of unknown external disturbances and actuator faults

Fazlyab, Ali Reza; Saberi, Farhad Fani; Kabganian, Mansour

doi:10.1016/j.asr.2015.10.026

Cited by 36 publications

(17 citation statements)

References 19 publications

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“…The entire proposed control structure is also shown in Figure 4. For clarification, it is notable that the system output has been defined as (8), which includes the flight speed and the three components of the angular velocity expressed in the body-fixed frame. The desired values of the system outputs are required in the MPC equation (19).…”

Section: Online Sequential Multimodel Structurementioning

confidence: 99%

“…Furthermore, the proposed structure can compensate for the effects of the faults, which are considered in the training of the local models as well as the faults, which are not considered in the training phase, but their dynamic effects are explicable through a combination of the pretrained local models. Finally, it should be noted that we can substitute the magnitude of the aircraft speed (V) in the system outputs (8) with the three components of the aircraft speed in the body-fixed frame (u, v, and w). Several simulations have been performed to compare the effect of this change of variables on the closed-loop performance.…”

Section: The Sixth Scenariomentioning

confidence: 99%

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Intelligent trajectory tracking of an aircraft in the presence of internal and external disturbances

Emami

Banazadeh

2019

Intl J Robust & Nonlinear

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Summary This research deals with developing an intelligent trajectory tracking control approach for an aircraft in the presence of internal and external disturbances. Internal disturbances including actuators faults, unmodeled dynamics, and model uncertainties as well as the external disturbances such as wind turbulence significantly affect the performance of the common trajectory tracking control approaches. There are several fault‐tolerant control approaches in the literature to overcome the effects of specific actuator or sensor faults during the flight. However, trajectory tracking control of an air vehicle in the presence of unexpected faults and simultaneous presence of wind turbulence is still a challenging problem. In this paper, an intelligent neural network‐based model predictive control structure is proposed, where the prediction model is updated in each iteration based on a novel proposed online sequential multimodel structure. A hybrid offline‐online learning algorithm is adopted in the introduced online sequential multimodel structure to identify the time‐varying dynamics of the system. The proposed control structure can satisfactorily deal with unexpected actuator faults and structural damages as well as unmodeled dynamics and wind turbulence. The stability of the closed‐loop system is proved under some realistic assumptions. The simulation results demonstrate the high capability of the proposed approach for trajectory tracking control of a conventional aircraft in the simultaneous presence of system faults and external disturbances.

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Section: Online Sequential Multimodel Structurementioning

confidence: 99%

Section: The Sixth Scenariomentioning

confidence: 99%

Intelligent trajectory tracking of an aircraft in the presence of internal and external disturbances

Emami

Banazadeh

2019

Intl J Robust & Nonlinear

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“…In addition, there is a possibility of inertia variation during missions in which variable inertia must be detected online to retain control performance. Also, tracking desired attitude in the presence of disturbances and inheriting high nonlinearities in dynamics of the system is one of the important challenges in spacecraft attitude control, especially in non-linear attitude tracking objectives (2)(3)(4)(5)(6) . Moreover, in a spacecraft in which reaction wheels are used as the main actuators, it is important to consider the actuators' dynamics during controller design (7) , and the actuator model cannot be ignored in the controller design process (8) .…”

Section: Introductionmentioning

confidence: 99%

Modelling, design and experimental implementation of non-linear attitude tracking with disturbance compensation using adaptive-sliding control based on quaternion algebra

2017

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In this paper, a non-linear tracking control algorithm is extended. The control objective of this research is to track a desired time-varying attitude of a satellite in the presence of inertia uncertainties and external disturbances, in order to be more suitable for implementation in a real-world application. In this investigation, the actuators are reaction wheels and the actuator dynamics are modelled in addition to the spacecraft dynamics. Thus, the control signal is DC motor voltage which is the most fundamental control variable and can be generated easily by a motor driver in practical cases. To achieve robust tracking of the desired time-varying attitude, a sliding mode controller is designed, and adaptive techniques are developed based on sliding mode control to overcome the inertia uncertainties and to estimate and compensate external disturbances. The kinematic equations of the satellite are expressed using quaternion parameters, and a novel control law will be derived by using a new facilitating approach in controller design, which is based on quaternion algebra, because of quaternion advantages, such as singularity rejection. Using this approach it will be more comfortable to deal with tedious mathematical operations, and on contrary with most of the previous studies, the terms corresponding to derivatives of the desired attitude are not neglected, and tracking capability is retained. The global stability of both methods (Sliding Mode Control (SMC) and adaptive sliding) is investigated using Lyapunov’s stability theorem. In order to validate the control methods, first, Simulink-ADAMS co-simulation of a 3-DOF attitude control is used to verify the algorithm performance and integrity, and finally, the control strategy is implemented on the Amirkabir University of Technology (AUT) 3-DOF attitude simulator for different types of non-linear attitudes. Both co-simulation and implementation results clearly illustrate the designed attitude control algorithm’s excellent performance in the various manoeuvres.

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“…To send back high-quality images, satellites have to meet stringent demands related to attitude accuracy [1][2][3]. However, periodic disturbances from spaceborne equipment result in difficulty in retaining stability in the attitude of spacecraft.…”

Section: Introductionmentioning

confidence: 99%

A Study on Optimal Compensation Design for Meteorological Satellites in the Presence of Periodic Disturbance

Cui

Fan

et al. 2018

Applied Sciences

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Featured Application: This work may be used to improve the accuracy of attitude stability of flexible meteorological satellites.Abstract: Periodic disturbance may cause serious effects on the attitude of meteorological satellites, and the attenuation of periodic disturbance is required. In this paper, a fundamental study on the optimal design of constant compensations against known-law periodic disturbance for meteorological satellites is investigated. An analytical solution for the relationship between the frequency and amplitude ratios and the response of a typical second-order vibration system is firstly derived. The compensation and disturbance torques are determined according to practical engineering. The criteria for designing the optimal compensations are based on the analytical and simulation results. Then, the criteria are applied to a flexible spacecraft actuated by constant control torque in the presence of sustained periodic disturbance. The optimal compensation torque parameters for spacecraft are acquired based on former criteria. The compensate effectiveness of the optimal compensation torque is provided and compared with results of other selections in the frequency and amplitude ratio domain. Numerical simulation results and experimental results clearly demonstrate the good performance of proposed criteria. This work provides a significant reference for the vibration attenuation of meteorological satellites in the present of periodic disturbance.

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Adaptive attitude controller for a satellite based on neural network in the presence of unknown external disturbances and actuator faults

Cited by 36 publications

References 19 publications

Intelligent trajectory tracking of an aircraft in the presence of internal and external disturbances

Intelligent trajectory tracking of an aircraft in the presence of internal and external disturbances

Modelling, design and experimental implementation of non-linear attitude tracking with disturbance compensation using adaptive-sliding control based on quaternion algebra

A Study on Optimal Compensation Design for Meteorological Satellites in the Presence of Periodic Disturbance

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