Disturbance observer‐based output feedback control of hydraulic servo system considering mismatched uncertainties and internal pressure dynamics stability

Wang, Chengwen; Zhang, Zhenyang; Wang, He; Zhao, Bin; Quan, Long

doi:10.1049/iet-cta.2019.0346

Cited by 21 publications

(12 citation statements)

References 42 publications

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“…Hence, the employment of disturbance observers (DOBs) can be considered as an effective way to cope with disturbances in EHSSs. Extended state observers (ESOs) were employed [27,28] for EHSSs to estimate both unmeasurable system states and matched/ mismatched disturbances; therefore, high-accuracy tracking performances were achieved. In another approach to cope with disturbances, some DOB designs based on exact differentiators [29] have been applied in hydraulic systems.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Robust Position Control of Electro-Hydraulic Servo Systems with Large Uncertainties and Disturbances

2022

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In this paper, a novel adaptive robust control (ARC) scheme is proposed for electro-hydraulic servo systems (EHSSs) with uncertainties and disturbances. All dynamic functions in system dynamics are effectively approximated by multi-layer radial basis function neural network (RBF NN)-based approximators with online adaptive mechanisms. Moreover, neural network-based disturbance observers (NN-DOBs) are established to actively estimate and efficiently compensate for the effects of not only the matched/mismatched but also the imperfections of RBF NN-based approximators on the control system. Based on that, the nonlinear robust control law which integrates RBF NNs and NN-DOBs is synthesized via the sliding mode control (SMC) approach to guarantee the high-accuracy position tracking performance of the overall control system. Furthermore, the problem of the combination between DOBs and RBF NNs is first introduced in this paper to treat both disturbances and uncertainties in the EHSS. The stability of the recommended control mechanism is proven by using Lyapunov theory. Finally, numerical simulations with several distinct frequency levels of reference trajectory are conducted to convincingly demonstrate the effectiveness of the proposed approach.

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Section: Introductionmentioning

confidence: 99%

Adaptive Robust Position Control of Electro-Hydraulic Servo Systems with Large Uncertainties and Disturbances

2022

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“…With mismatched uncertainties and internal pressure dynamics stability considered, Wang et al. [27] presented an easy‐to‐implement output feedback controller with the aid of extended‐state‐observer. The effectiveness of the above output feedback control methods was verified by extensive experiments.…”

Section: Introductionmentioning

confidence: 99%

Full state constrained command filtered output feedback control for the electro‐hydraulic ammunition ramming system

Yin

Nie

Qian

et al. 2022

IET Control Theory & Appl

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A barrier Lyapunov functions-based command filtered output feedback control scheme is presented for the electro-hydraulic ammunition ramming system (EHARS) with position and velocity constraints in this paper. Due to the limitation of compact installation space in ramming mechanism, there remain some immeasurable signals such as the velocity of projectile and pressures in hydro-cylinder; thus, a state observer is designed to estimate the unmeasured states of EHARS. The barrier Lyapunov functions theory is adopted to guarantee position and velocity constraints of projectile are not violated. In order to suppress the complexity of differential explosion in backstepping iteration, command filtered technology and corresponding compensating technique of filtering errors are applied. By the stability theory of Lyapunov, the stability of the closed-loop system and the boundedness of the whole state in EHARS are theoretically proved. Simulation results show prescribed position-tracking accuracy and desired velocity of projectile under different firing angles, which indicates the effectiveness of the proposed method.

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“…The fundamental reason is that the order selection of the ADRC is not reasonable due to improper model abstraction. In the existing literature, the order of ADRC is determined by the reduced-order model [40][41][42]. In addition, in previous studies, ESO-based approaches have been studied in dealing with large uncertainties, mismatches, and unknown disturbances of the EHS system.…”

Section: Introductionmentioning

confidence: 99%

Model‐free linear active disturbance rejection output feedback control for electro‐hydraulic proportional system with unknown dead‐zone

Wang

Zhao

Zhang

et al. 2021

IET Control Theory & Appl

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Here, a model‐free linear active disturbance rejection controller (LADRC) integrating dead‐zone inverse compensation for an electro‐hydraulic proportional (EHP) system with an unknown dead‐zone is proposed. Unlike the existing LADRC design idea, the presented method uses a new hydraulic system block diagram to select the order of LADRC instead of the highest degree of the system. Furthermore, the rationality of order selection is illustrated by the frequency domain analysis theory. To solve the dead‐zone of the proportional valve, a novel structural transformation is proposed by constructing a new dead‐zone, which has a definite physical meaning and can be obtained by the experimental measurement. Then, the dead‐zone disturbance is reduced, and the burden of the observer is relieved. At the same time, the controller parameters are decreased from three to two equivalent PI controller. Besides, the stability of the closed‐loop system is analysed by the describing function method. The performance of the proposed control solution has been investigated through extensive comparative experiments under different working conditions. The experimental results successfully demonstrate the effectiveness and practicality of the presented method.

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Disturbance observer‐based output feedback control of hydraulic servo system considering mismatched uncertainties and internal pressure dynamics stability

Cited by 21 publications

References 42 publications

Adaptive Robust Position Control of Electro-Hydraulic Servo Systems with Large Uncertainties and Disturbances

Adaptive Robust Position Control of Electro-Hydraulic Servo Systems with Large Uncertainties and Disturbances

Full state constrained command filtered output feedback control for the electro‐hydraulic ammunition ramming system

Model‐free linear active disturbance rejection output feedback control for electro‐hydraulic proportional system with unknown dead‐zone

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