Electro-Hydraulic Control Techniques and Applications of Launching Systems

Kuai, Tengfei; Zou, Qi; Zhao, Xia; Zhao, Changfang; Ren, Jie; Le, Guigao

doi:10.1109/icectt.2019.00018

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…As a kind of conventional electromechanical system, electrohydraulic systems (EHS) are widely used in engineering practices, such as marine engineering, power generation projects, automobile engineering, safety engineering and so on [1][2][3][4][5][6] due to the fact that EHS possesses the characteristics of high energy density and accurate control ability. Actually, a series of research achievements on the control issue of EHS has been published in recent years with plentiful advanced control methods proposed, such as backstepping control [7,8], sliding mode control [9,10], robust integral control [11,12], neural network control [13,14], and feedback linearization control [15,16].…”

Section: Introductionmentioning

confidence: 99%

Variable Structure Disturbance Observer Based Dynamic Surface Control of Electrohydraulic Systems with Parametric Uncertainty

et al. 2022

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This paper focuses on the position tracking control issue of electrohydraulic systems (EHS). The dynamical model of EHS is introduced in the first place, based on which a type of Variable Structure Disturbance Observer (VSDO) is constructed for EHS to estimate the parametric uncertainty the EHS possesses. Then, a backstepping controller is designed under VSDO to realize the high precision position tracking purpose. To avoid the phenomenon of differential explosion, a dynamic surface control method is adopted in this paper, which improved the position tracking control performance of EHS. The proposed theoretical results are verified by numerical simulation and experiment to illustrate the feasibility.

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Section: Introductionmentioning

confidence: 99%

Variable Structure Disturbance Observer Based Dynamic Surface Control of Electrohydraulic Systems with Parametric Uncertainty

et al. 2022

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“…Hydraulic servo-mechanism has superiorly feature of high power/weight ratio and can support large force/torque comparing to electric motor counterpart, and can hardly be replaced in modern defense and industrial, such as airborne actuating system [1], weapon follow-up system [2], load simulator [3], shield equipment [4], and so on. However, hydraulic actuators have its inherent nonlinearities (for example, the flow dynamic of valve port) and various modeling uncertainties (for example, the hard-modeled nonlinear friction, matched or unmatched disturbance, hysteresis [5], and so on), which brings great difficulty to the development of high performance motion tracking controller.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Adaptive Sliding Mode Motion Control of Hydraulic Servo-Mechanism With Modeling Uncertainty: A Barrier Function-Based Method

Dong

2020

IEEE Access

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This research focuses on motion control of hydraulic servo-mechanism and presents a novel quasi-adaptive sliding mode control algorithm with barrier function-based control gain. The mathematical model of the system is established in integral series format to contribute to the controller design. The utilized sliding mode control gain is designed to be adapted with the change of design error related to tracking error. It can first increase until the design error reaches to a small domain at a designed time by utilizing constant gain. And then the control gain will automatically switch to barrier function form to hold design error within a predefined domain un-depending on the modeling uncertainties theoretically. Correspondingly, the tracking error will converge to a small domain. The system stability is proved via Lyapunov analysis. By comparing to three classic controllers with motion tracking experiments, the achievable higher tracking accuracy of the proposed new control law are validated sufficiently.

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Robust Pitching Disturbance Force Attenuation for Tractor Considering Functional Constraints

2020

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Tractors are attached with function-specific implements with the help of an electro-hydraulic hitch system, to carry out various farm operations. Forces arising during travel with the lifted implement on uneven terrain, generate disturbance forces on the hitch system. In this study, the electro-hydraulic system was controlled such that the disturbance forces are attenuated. A second order transfer function model of the hitch system was obtained using experimental data. In order to account for the nonlinearities in the system, an advanced Sliding Mode Controller with Power Rate Exponential Reaching Law was developed to control the hitch system to attenuate the disturbance forces. Variation in system parameters due to change of implements was taken into account by making the system adaptive using a Recursive Least Squares (RLS) parameter estimator, which was used to estimate and update the system parameters in the controller. Position regulation was incorporated to prevent the implement from reaching its mechanical limits. Valve deadzone and operating input limits were incorporated into this design. Also, considering the presence of two valves to supply fluid to the same cylinder, a trigger logic was developed to suitably choose the valve to be operated. The controller was found to provide an average disturbance force attenuation of 82.9% while being robust to a random variation in each parameter up to ±80%.

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Electro-Hydraulic Control Techniques and Applications of Launching Systems

Cited by 5 publications

References 4 publications

Variable Structure Disturbance Observer Based Dynamic Surface Control of Electrohydraulic Systems with Parametric Uncertainty

Variable Structure Disturbance Observer Based Dynamic Surface Control of Electrohydraulic Systems with Parametric Uncertainty

Quasi-Adaptive Sliding Mode Motion Control of Hydraulic Servo-Mechanism With Modeling Uncertainty: A Barrier Function-Based Method

Robust Pitching Disturbance Force Attenuation for Tractor Considering Functional Constraints

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