A review of flow control methods

Ali, Hasan H.; Fales, Roger

doi:10.1007/s40435-020-00730-y

Cited by 14 publications

(11 citation statements)

References 48 publications

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“…At steady state working conditions, , and , then, . Also, the effective spring is neglected typically in the velocity control systems [10], i.e., Kt=0. Therefore, Eqn.…”

Section: Model Uncertainty and Controlmentioning

confidence: 99%

“…( 5) may be updated as; (9) Multiplying Eq. ( 9) by 𝜏/Pdr gives: (10) Let then, that the equation of the pressure rise can be written in the non-dimensional as, (11) Figure 1 Electromagnetic Actuator Schematic In figure (1), m is the moving piston mass and K is the spring stiffness. Ffr and Fspring are forces that are generated due to friction and spring, respectively.…”

Section: Model Uncertainty and Controlmentioning

confidence: 99%

“…Variable flow control techniques are used in fluid power systems such as displacement control systems [1][2][3], speedcontrolled systems [4][5][6], and valve control systems [7][8][9]. A comparison of those techniques can be found in [10]. In [11], a model was created for the flow and torque of hydraulic motor and efficiency maps were plotted.…”

Section: Introductionmentioning

confidence: 99%

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H∞ Loop Shaping Control Design of the Rotational Velocity of a Hydraulic Motor

2021

IJOMAM

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In this work, a hydraulic system in which the hydraulic motor velocity is controlled using a variable speed pump. A comprehensive dynamic model was created and the performance and stability of the open loop system were assessed. Then, PID and loop shaping H-infinity controllers were designed with the aim of improving the system performance. The multiplicative uncertainty, that is associated with uncertain parameters in the speed controlled velocity control system, was studied. Two parameters were introduced in the uncertainty analysis; the leakage coefficient and the viscous friction coefficient. The requirements of the system performance were defined in the frequency domain that was used to determine the robustness of the closed-loop velocity control system. The results showed that the proposed open loop hydraulic system is stable. It was also shown that using feedback control greatly improves the system performance. The performance of the nominal system, based on the obtained results, with H∞ controller was found to be better than that of the system with PID controller. It was found that the H∞ controller has the advantages of having robust performance by considering the uncertainty in addition to not having an integral control as in the PID control system. In addition, it was found that the system with the PID controller did not achieve robust performance.

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“…At steady state working conditions, , and , then, . Also, the effective spring is neglected typically in the velocity control systems [10], i.e., Kt=0. Therefore, Eqn.…”

Section: Model Uncertainty and Controlmentioning

confidence: 99%

Section: Model Uncertainty and Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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H∞ Loop Shaping Control Design of the Rotational Velocity of a Hydraulic Motor

2021

IJOMAM

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“…In Ref. [ 18 ], the flow control methods for hydraulic system were reviewed. It was stated that displacement controlled systems have the highest efficiency compared to other flow control strategies.…”

Section: Introductionmentioning

confidence: 99%

Design of uncertain displacement controlled velocity control system for hydraulic actuator

Mohmmed,

Hassan,

Ali

et al. 2024

Heliyon

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“…Luyue Yin proposed a novel finite-time output feedback controller with parameter adaptation for electro-hydraulic servo systems [17]. However, because of low energy efficiency and high cost of these control valves, the application scenarios are limited [18]. In recent years, many scholars have carried out new explorations in order to reduce the cost of position control system valves and improve the application scope.…”

Section: Introductionmentioning

confidence: 99%

Research and Experimental Analysis of Hydraulic Cylinder Position Control Mechanism Based on Pressure Detection

et al. 2021

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This paper studies the precise position control of the hydraulic cylinder in the hydraulic support. The aim of this paper is to develop a method of hydraulic cylinder position control based on pressure and flow coupling, which takes the coupling feedback of load and flow into account, especially in the scene of cooperative control under the condition of multiple actuators and variable load. This method solves the problems of slow movement and sliding effect of hydraulic support in the traditional time-dependent hydraulic position control, as well as better realizes the intelligent and unmanned development of the fully mechanized mining face. First, based on the flow continuity equation and Newton Euler dynamic equation, the flow and stroke control model with the input and output pressure of hydraulic cylinder is established. Then, the effectiveness and correctness of the control model are verified by the comparison between the hydraulic system simulation software, AMESim, and the experiment. Finally, a test system is built. When the system pressure is large than 10 MPa, the error between the data determined by the fitting algorithm and the actual detection data is within 5%, which verifies the effectiveness of the theory and simulation model.

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A review of flow control methods

Cited by 14 publications

References 48 publications

H∞ Loop Shaping Control Design of the Rotational Velocity of a Hydraulic Motor

H∞ Loop Shaping Control Design of the Rotational Velocity of a Hydraulic Motor

Design of uncertain displacement controlled velocity control system for hydraulic actuator

Research and Experimental Analysis of Hydraulic Cylinder Position Control Mechanism Based on Pressure Detection

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