Observer-based Fault-Tolerant Control of an Electro-Hydraulic Actuator with mismatched disturbance

Phan, Van Du; Ahn, Kyoung Kwan

doi:10.1109/icmt53429.2021.9687272

Cited by 3 publications

(4 citation statements)

References 12 publications

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“…In [21,24,25], authors are only interested to position sensor fault identification for EHSS. Whereas, in this study, the problem of multiple sensor faults detection, estimation, and isolation are discussed for EHSS with matched and unmatched disturbances.…”

Section: Remarkmentioning

confidence: 99%

“…Especially, NUIO is an excellent way to accurately estimate and distinguish disturbances and faults developed based on the linear matrix inequality (LMI) method. In EHSS applications, Du et al given fault diagnosis using NUIO for position sensor fault while the other sensors were not considered [21]. Reference [22] investigated an UIO-integrated extended finite impulse response to solve multi-sensor fault but the matched, unmatched disturbance were also neglected.…”

Section: Introductionmentioning

confidence: 99%

“…(i) Compared with only position sensor fault analyzed in [21,24,25]. In this paper, three sensor faults are simultaneously occurred, then fault observers are constructed to simultaneously estimate the sensor faults (i.e., position, velocity, and load pressure sensor fault) under the influences of the lumped disturbance.…”

Section: Introductionmentioning

confidence: 99%

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Fault-tolerant control for an electro-hydraulic servo system with sensor fault compensation and disturbance rejection

Phan

Ahn

2023

Nonlinear Dyn

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The electro-hydraulic servo system (EHSS) usually faces multiple sensor faults and disturbances, which is difficult to achieve good tracking control, reliability, and stability control. In this article, an advanced fault-tolerant controller is proposed for an EHSS to deal with the above challenge. The three fault observers, called nonlinear unknown input observers (NUIOs), are developed to effectively estimate the position, velocity, pressure sensor faults and the system states. The fault detection, estimation, and isolation are then presented as effective for multiple sensors failure at a time. The first NUIO for position sensor fault is utilized for the tracking control, while the other NUIOs are used for alarm proposal. The adverse effects caused by the matched and unmatched disturbances are eliminated by two extended state observers (ESOs). In addition, to avoid the “explosion of complexity” when computing the derivatives of virtual control laws, the dynamic surface control is applied to design the fault-tolerant control (FTC) scheme. The Lyapunov principle ensures system stability under lumped disturbance and faulty conditions. Finally, simulation studies and evaluation results are performed to demonstrate the validity of the proposed FTC algorithm.

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Section: Remarkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fault-tolerant control for an electro-hydraulic servo system with sensor fault compensation and disturbance rejection

Phan

Ahn

2023

Nonlinear Dyn

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“…An active force control system is developed to provide an accurate real-time force loading for the landing gear of the M-346 "iron bird", which is an integrated testing rig for the simulation, confirmation, and verification of the flight controls, hydraulic system, and landing gear of the M-346 trainer, adopting the servo valve to control the hydraulic actuator, combined with a nonlinear adaptive control law to achieve precise loading controls [11]. To account for the internal and external disturbances that affect the mechanism of the loading simulator, a more accurate mathematical model, including nonlinear factors and uncertainties, advanced control algorithms (i.e., backstepping [12], sliding mode, neural network [13], iterative learning control [14]), and sensor faults and disturbances observation [15,16], is utilized for accurate tracking and nonlinear compensation. The backstepping adaptive control, combined with the modified LuGre friction model [17], is introduced into the force-tracking control of the loading simulator [18].…”

Section: Introductionmentioning

confidence: 99%

Terminal Sliding Mode Force Control Based on Modified Fast Double-Power Reaching Law for Aerospace Electro-Hydraulic Load Simulator of Large Loads

Zhao,

Qiu,

Huang

et al. 2024

Actuators

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This paper addresses the force-tracking problem of aerospace electro-hydraulic load simulators under the influence of high inertia, large loads, and a strong coupling force disturbance. An accurate mathematical model is initially derived to describe the characteristics of the load simulator system, the cause of the surplus force, and the strong phase lag due to large inertia. In order to overcome the position interference of the system and the large phase lag problem, a terminal sliding mode control strategy based on the modified fast double-power reaching law is proposed, based on the accurate mathematical model. This control strategy effectively suppresses the chattering problem of the sliding control and implements the finite time convergence of the system through the design of the reaching law and terminal sliding surface, ensuring the robustness of the system and the accuracy of the force-tracking problem. Finally, a comparison of the simulation and experimental results based on the design of different strategy controllers is performed to verify the effectiveness of the control strategy and system adaptability.

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Optimized-Based Fault-Tolerant Control of an Electro-Hydraulic System with Disturbance Rejection

Phan

Ahn

2022

Applied Sciences

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In this article, the design and implementation of a fault-tolerant controller are proposed for an electro-hydraulic actuator (EHA) in the presence of disturbances and actuator faults. The existence of nonlinearities, uncertainties, and a bias fault (i.e., internal leakage fault) in the system dynamics significantly decreases the desired performance. The nonlinear disturbance observers (NDO) are constructed to handle the adverse influences caused by the above disadvantages. The whole fault-tolerant control (FTC) scheme consists of two design loops: an inner force control loop and an outer position control loop. The inner loop is based on an optimized backstepping framework to achieve the optimal performance, whilst the problem of uncertainties and disturbances is dealt with using a terminal sliding mode directly designed from the position tracking error. It is shown by theoretical analysis that system stability is ensured under faulty conditions. Finally, simulation results and comparison studies are conducted to further verify the effectiveness of the proposed approach.

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Observer-based Fault-Tolerant Control of an Electro-Hydraulic Actuator with mismatched disturbance

Cited by 3 publications

References 12 publications

Fault-tolerant control for an electro-hydraulic servo system with sensor fault compensation and disturbance rejection

Fault-tolerant control for an electro-hydraulic servo system with sensor fault compensation and disturbance rejection

Terminal Sliding Mode Force Control Based on Modified Fast Double-Power Reaching Law for Aerospace Electro-Hydraulic Load Simulator of Large Loads

Optimized-Based Fault-Tolerant Control of an Electro-Hydraulic System with Disturbance Rejection

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