Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control
This study is concerned with developing a robust tracking control system that merges the optimal control theory with fractional-order-based control and the heuristic optimization algorithms into a single framework for the non-minimum phase pitch angle dynamics of Boeing 747 aircraft. The main contro...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/24/11705 |
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| author | Aisha Sir Elkhatem Seref Naci Engin Amjad Ali Pasha Mustafa Mutiur Rahman Subramania Nadaraja Pillai |
| author_facet | Aisha Sir Elkhatem Seref Naci Engin Amjad Ali Pasha Mustafa Mutiur Rahman Subramania Nadaraja Pillai |
| author_sort | Aisha Sir Elkhatem |
| collection | DOAJ |
| description | This study is concerned with developing a robust tracking control system that merges the optimal control theory with fractional-order-based control and the heuristic optimization algorithms into a single framework for the non-minimum phase pitch angle dynamics of Boeing 747 aircraft. The main control objective is to deal with the non-minimum phase nature of the aircraft pitching-up action, which is used to increase the altitude. The fractional-order integral controller (FIC) is implemented in the control loop as a pre-compensator to compensate for the non-minimum phase effect. Then, the linear quadratic regulator (LQR) is introduced as an optimal feedback controller to this augmented model ensuring the minimum phase to create an efficient, robust, and stable closed-loop control system. The control problem is formulated in a single objective optimization framework and solved for an optimal feedback gain together with pre-compensator parameters according to an error index and heuristic optimization constraints. The fractional-order integral pre-compensator is replaced by a fractional-order derivative pre-compensator in the proposed structure for comparison in terms of handling the non-minimum phase limitations, the magnitude of gain, phase-margin, and time-response specifications. To further verify the effectiveness of the proposed approach, the LQR-FIC controller is compared with the pole placement controller as a full-state feedback controller that has been successfully applied to control aircraft dynamics in terms of time and frequency domains. The performance, robustness, and internal stability characteristics of the proposed control strategy are validated by simulation studies carried out for flight conditions of fault-free, 50%, and 80% losses of actuator effectiveness. |
| first_indexed | 2024-03-10T04:37:15Z |
| format | Article |
| id | doaj.art-043c08a4360b43759d6b8505cd46163d |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T04:37:15Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-043c08a4360b43759d6b8505cd46163d2023-11-23T03:37:04ZengMDPI AGApplied Sciences2076-34172021-12-0111241170510.3390/app112411705Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight ControlAisha Sir Elkhatem0Seref Naci Engin1Amjad Ali Pasha2Mustafa Mutiur Rahman3Subramania Nadaraja Pillai4Aeronautical Engineering Department, Sudan University of Science and Technology (SUSTECH), Khartoum 11111, SudanControl and Automation Engineering Department, Yildiz Technical University, Istanbul 3420, TurkeyAerospace Engineering Department, King Abdulaziz University, Jeddah 21589, Saudi ArabiaDepartment of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, CanadaTurbulence & Flow Control Lab, School of Mechanical Engineering, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, IndiaThis study is concerned with developing a robust tracking control system that merges the optimal control theory with fractional-order-based control and the heuristic optimization algorithms into a single framework for the non-minimum phase pitch angle dynamics of Boeing 747 aircraft. The main control objective is to deal with the non-minimum phase nature of the aircraft pitching-up action, which is used to increase the altitude. The fractional-order integral controller (FIC) is implemented in the control loop as a pre-compensator to compensate for the non-minimum phase effect. Then, the linear quadratic regulator (LQR) is introduced as an optimal feedback controller to this augmented model ensuring the minimum phase to create an efficient, robust, and stable closed-loop control system. The control problem is formulated in a single objective optimization framework and solved for an optimal feedback gain together with pre-compensator parameters according to an error index and heuristic optimization constraints. The fractional-order integral pre-compensator is replaced by a fractional-order derivative pre-compensator in the proposed structure for comparison in terms of handling the non-minimum phase limitations, the magnitude of gain, phase-margin, and time-response specifications. To further verify the effectiveness of the proposed approach, the LQR-FIC controller is compared with the pole placement controller as a full-state feedback controller that has been successfully applied to control aircraft dynamics in terms of time and frequency domains. The performance, robustness, and internal stability characteristics of the proposed control strategy are validated by simulation studies carried out for flight conditions of fault-free, 50%, and 80% losses of actuator effectiveness.https://www.mdpi.com/2076-3417/11/24/11705actuator fault-tolerantaircraft dynamicsheuristic optimizationfractional-order controlnon-minimum phaseoptimal control |
| spellingShingle | Aisha Sir Elkhatem Seref Naci Engin Amjad Ali Pasha Mustafa Mutiur Rahman Subramania Nadaraja Pillai Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control Applied Sciences actuator fault-tolerant aircraft dynamics heuristic optimization fractional-order control non-minimum phase optimal control |
| title | Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control |
| title_full | Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control |
| title_fullStr | Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control |
| title_full_unstemmed | Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control |
| title_short | Robust Control for Non-Minimum Phase Systems with Actuator Faults: Application to Aircraft Longitudinal Flight Control |
| title_sort | robust control for non minimum phase systems with actuator faults application to aircraft longitudinal flight control |
| topic | actuator fault-tolerant aircraft dynamics heuristic optimization fractional-order control non-minimum phase optimal control |
| url | https://www.mdpi.com/2076-3417/11/24/11705 |
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