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Saturated RISE Control of Hydraulic Servo System with Modeling Uncertainties.

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Title: Saturated RISE Control of Hydraulic Servo System with Modeling Uncertainties.
Authors: Dongjie Bai1 b18339631260@163.com, Zhenle Dong2 dong_zhenle@163.com, Pengxiang Zhang1 1767858772@qq.com, Zhigang Zhou3 hnmczzg@163.com, Siyuan Pan4 499017141@qq.com
Source: Engineering Letters. Jun2025, Vol. 33 Issue 6, p2128-2133. 6p.
Subjects: Hydraulic control systems, Tangent function, Dynamic pressure, Hyperbolic functions, Hydraulic models, Valves
Abstract: The demand for high-accuracy hydraulic servo system in industry and national defense is becoming increasingly urgent. This paper focuses on the high accuracy motion tracking control of hydraulic servo system with input saturation. Firstly, nonlinear mathematical model of the valve-controlled hydraulic servo system is established, which contains the load dynamic, the pressure dynamic and the flow equation. Secondly, the state-space-equation of hydraulic servo system is constructed in integrator form to facilitate controller derivation, and a saturated controller based on RISE (robust integral of the sign of error) method is designed, which includes a model compensation term based on desired trajectory and a nonlinear RISE term in the form of hyperbolic tangent function. Then, through rigorous Lyapunov analysis, it is proven that the proposed controller can theoretically achieve asymptotic stability, while ensuring that the amplitude of control input meets the saturation limit requirements. Finally, the effectiveness of the proposed controller approach is verified through simulation of two comparative controllers under two desired trajectories with sudden disturbance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The demand for high-accuracy hydraulic servo system in industry and national defense is becoming increasingly urgent. This paper focuses on the high accuracy motion tracking control of hydraulic servo system with input saturation. Firstly, nonlinear mathematical model of the valve-controlled hydraulic servo system is established, which contains the load dynamic, the pressure dynamic and the flow equation. Secondly, the state-space-equation of hydraulic servo system is constructed in integrator form to facilitate controller derivation, and a saturated controller based on RISE (robust integral of the sign of error) method is designed, which includes a model compensation term based on desired trajectory and a nonlinear RISE term in the form of hyperbolic tangent function. Then, through rigorous Lyapunov analysis, it is proven that the proposed controller can theoretically achieve asymptotic stability, while ensuring that the amplitude of control input meets the saturation limit requirements. Finally, the effectiveness of the proposed controller approach is verified through simulation of two comparative controllers under two desired trajectories with sudden disturbance. [ABSTRACT FROM AUTHOR]
ISSN:1816093X