Cybernetic Proportional System for a Hydraulic Cylinder Drive Using Proportional Seat-Type Valves

Kogler, Helmut; Plöckinger, Andreas; Foschum, Paul

doi:10.3390/act12100370

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Hydraulic drive plays an important role in modern industry [1][2][3]. The multiple-stroke piston motor has the characteristic of high output torque at low speed and is widely used in military, engineering machinery, shipbuilding, and other industries [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Design Method of the Stroke Ring Based on Deformation Pre-Compensation

An,

Gao,

Dong

et al. 2024

Actuators

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A common consensus is that an optimized curve profile of the stroke ring in the multiple-stroke piston motor can make the output torque more stable. However, the ring generates elastic deformation during operation, which causes the piston component movement trajectory to deviate from the ideal design curve. To address this issue, first, a liquid–solid coupling simulation model was established to obtain the deformation of the ring, and the accuracy of the model was verified through experiments. Second, a stroke ring curve design method based on elastic deformation pre-compensation was proposed. Through this method, a compensated curve can be obtained to make the actual working curve more in line with the ideal curve. Finally, the dynamic characteristics of three different types of multiple-stroke piston motor curves were analyzed—the ideal design curve, the uncompensated working curve, and the compensated working curve. The results showed that the motor torque pulsation rates are 0.821%, 4.723%, and 0.986%, respectively, and the compensated working curve has a relatively reduced pulsation rate of 79.12% compared to the uncompensated working curve, which verifies that this design method can effectively improve motor performance.

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Section: Introductionmentioning

confidence: 99%

Design Method of the Stroke Ring Based on Deformation Pre-Compensation

An,

Gao,

Dong

et al. 2024

Actuators

View full text Add to dashboard Cite

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Pressure Control of Multi-Mode Variable Structure Electro–Hydraulic Load Simulation System

Hao,

Yan,

Zhang

et al. 2024

Sensors

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During the loading process, significant external position disturbances occur in the electro–hydraulic load simulation system. To address these position disturbances and effectively mitigate the impact of uncertainty on system performance, this paper first treats model parameter uncertainty and external disturbances as lumped disturbances. The various states of the servo valve and the pressures within the hydraulic cylinder chambers are then examined. Building on this foundation, the paper proposes a nonlinear multi-mode variable structure independent load port electro–hydraulic load simulation system that is tailored for specific loading conditions. Secondly, in light of the significant motion disturbances present, this paper proposes an integral sliding mode active disturbance rejection composite control strategy that is based on fixed-time convergence. Based on the structure of the active disturbance rejection control framework, the fixed-time integral sliding mode and active disturbance rejection control algorithms are integrated. An extended state observer is designed to accurately estimate the lumped disturbance, effectively compensating for it to achieve precise loading of the independent load port electro–hydraulic load simulation system. The stability of the designed controller is also demonstrated. The results of the simulation research indicate that when the command input is a step signal, the pressure control accuracy under the composite control strategy is 99.94%, 99.86%, and 99.76% for disturbance frequencies of 1 Hz, 3 Hz, and 5 Hz, respectively. Conversely, when the command input is a sinusoidal signal, the pressure control accuracy remains high, measuring 99.94%, 99.8%, and 99.6% under the same disturbance frequencies. Furthermore, the simulation demonstrates that the influence of sensor random noise on the system remains within acceptable limits, highlighting the effective filtering capabilities of the extended state observer. This research establishes a solid foundation for the collaborative control of load ports and the engineering application of the independent load port electro–hydraulic load simulation system.

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Cybernetic Proportional System for a Hydraulic Cylinder Drive Using Proportional Seat-Type Valves

Cited by 2 publications

References 16 publications

Design Method of the Stroke Ring Based on Deformation Pre-Compensation

Design Method of the Stroke Ring Based on Deformation Pre-Compensation

Pressure Control of Multi-Mode Variable Structure Electro–Hydraulic Load Simulation System

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