A unified framework for passive–active fault-tolerant control systems considering actuator saturation and L<sub>∞</sub> disturbances

Khatibi, Mahmood; Haeri, ءMohammad

doi:10.1080/00207179.2017.1365172

Cited by 15 publications

(11 citation statements)

References 23 publications

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“…The fast instantaneous response of the fixed-time cooperative control strategy of MSVs results in the actuator being possible to be saturated owing to large control torque [30]. We have to pay attention to the problem of actuator saturation, because the actuator saturation may cause an instable control system [31]. In [32], they investigated the distributed fixedtime attitude coordinated control problem for multiple spacecraft subject to actuator saturation under the directed topology, and could ensure fixed-time stability of the system even in the case of saturation of the actuator.…”

Section: Introductionmentioning

confidence: 99%

Nonsingular Terminal Sliding Mode-Based Distributed Cooperative Event-Triggered Control for Multiple Surface Vessels Under Actuator Faults With Input Saturation

2023

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In this paper, a fixed-time distributed cooperative control under actuator faults with input saturation scheme is designed for multiple surface vessels (MSVs). Firstly, a fixed-time disturbance observer (FxDO) is introduced to observe unknown environmental disturbances and actuator faults (AF). Secondly, to deal with the actuator saturation, an improved nonlinear antiwindup compensator is introduced to compensate for the saturation effect of the actuator. Thirdly, a fixed-time fault-tolerant event-triggered control law with the actuator saturation is applied to cooperative control based on a fixed-time nonsingular terminal sliding mode manifold (FxNTSMM), and their cooperative errors can converge within fixed time. At the same time, the upper bound of convergence time is independent of the initial state. Finally, the stability analysis of the cooperative control system is given to prove that the system can realize the practical fixed time stability, and Zeno phenomenon is avoided by theoretical proof. Simulation results are given to demonstrate the effectiveness of the proposed control scheme.INDEX TERMS Multiple surface vessels, disturbance observer, fixed-time sliding mode control, eventtriggered controller, input saturation, actuator faults.

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Section: Introductionmentioning

confidence: 99%

Nonsingular Terminal Sliding Mode-Based Distributed Cooperative Event-Triggered Control for Multiple Surface Vessels Under Actuator Faults With Input Saturation

2023

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“…Therefore, the PFTCS has an advantage over the AFTCS in terms of being a quicker controller than the AFTCS but is only limited to the tolerance of faults considered at the design stage This issue can be resolved if both controllers operate in parallel, forming a hybrid controller. The hybrid FTC is reviewed in [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Advanced Fault-Tolerant Anti-Surge Control System of Centrifugal Compressors for Sensor and Actuator Faults

Alsuwian

Amin

Maqsood

et al. 2022

Sensors

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Faults frequently occur in the sensors and actuators of process machines to cause shutdown and process interruption, thereby creating costly production loss. centrifugal compressors (CCs) are the most used equipment in process industries such as oil and gas, petrochemicals, and fertilizers. A compressor control system called an anti-surge control (ASC) system based on many critical sensors and actuators is used for the safe operation of CCs. In this paper, an advanced active fault-tolerant control system (AFTCS) has been proposed for sensor and actuator faults of the anti-surge control system of a centrifugal compressor. The AFTCS has been built with a dedicated fault detection and isolation (FDI) unit to detect and isolate the faulty part as well as replace the faulty value with the virtual redundant value from the observer model running in parallel with the other healthy sensors. The analytical redundancy is developed from the mathematical modeling of the sensors to provide estimated values to the controller in case the actual sensor fails. Dual hardware redundancy has been proposed for the anti-surge valve (ASV). The simulation results of the proposed Fault-tolerant control (FTC) for the ASC system in the experimentally validated CC HYSYS model reveal that the system continued to operate in the event of faults in the sensors and actuators maintaining system stability. The proposed FTC for the ASC system is novel in the literature and significant for the process industries to design a highly reliable compressor control system that would continue operation despite faults in the sensors and actuators, hence preventing costly production loss.

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“…Control designers have a wide trajectory implementing one of its approaches, the Passive Fault-Tolerant Control (PFTC) [5], [6], nonetheless these controllers lack the flexibility needed to avoid different faults, specially when they have a wide harm-grade. Opposite to that tendency, Active Fault-Tolerant Control (AFTC) approach [7]- [9] offers a versatile environment as they are designed to detect, grade and isolate the fault source in a first instance during the Fault Detection and Isolation (FDI) phase and, afterwards, modify the control law to overtake the fault during Control Re-design (CR) phase without stopping the system.…”

Section: Introductionmentioning

confidence: 99%

On Fault-Tolerant Control Systems: A Novel Reconfigurable and Adaptive Solution for Industrial Machines

et al. 2020

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Fault-Tolerant Controllers (FTCs) modify system behaviour to overcome faults without human interaction. These control algorithms, when based on active approach, detect, quantify and isolate the faults during Fault Detection and Isolation (FDI) phase. Afterwards, during Control Redesign (CR) phase, the controller is reconfigured and adapted to the faulty situation. This last phase has been approached by a wide variety of algorithms, being Adaptive Controllers (ACs) the ones studied in this paper. Despite their potentiality to overcome faults, industrial manufacturing systems demand robustness and flexibility levels hardly achievable by these algorithms. On this context, the paper proposes to upgrade them introducing novel Digital-Twin (DT) models to increase its flexibility and Anti-Windup (AW) techniques to improve their robustness. These novelties reach their maximum potential when FDI and CR phases merge to generate a novel FTC platform based on a Bank of Controllers (BC), improving the fault avoidance process as controller gains are switched to the ones that recover the machine more efficiently. INDEX TERMS Virtual manufacturing, fault tolerant systems, adaptive control, digital systems.

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A unified framework for passive–active fault-tolerant control systems considering actuator saturation and L_∞ disturbances

Cited by 15 publications

References 23 publications

Nonsingular Terminal Sliding Mode-Based Distributed Cooperative Event-Triggered Control for Multiple Surface Vessels Under Actuator Faults With Input Saturation

Nonsingular Terminal Sliding Mode-Based Distributed Cooperative Event-Triggered Control for Multiple Surface Vessels Under Actuator Faults With Input Saturation

Advanced Fault-Tolerant Anti-Surge Control System of Centrifugal Compressors for Sensor and Actuator Faults

On Fault-Tolerant Control Systems: A Novel Reconfigurable and Adaptive Solution for Industrial Machines

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A unified framework for passive–active fault-tolerant control systems considering actuator saturation and L∞ disturbances

Cited by 15 publications

References 23 publications

Nonsingular Terminal Sliding Mode-Based Distributed Cooperative Event-Triggered Control for Multiple Surface Vessels Under Actuator Faults With Input Saturation

Nonsingular Terminal Sliding Mode-Based Distributed Cooperative Event-Triggered Control for Multiple Surface Vessels Under Actuator Faults With Input Saturation

Advanced Fault-Tolerant Anti-Surge Control System of Centrifugal Compressors for Sensor and Actuator Faults

On Fault-Tolerant Control Systems: A Novel Reconfigurable and Adaptive Solution for Industrial Machines

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A unified framework for passive–active fault-tolerant control systems considering actuator saturation and L_∞ disturbances