Inlet metering pump analysis and experimental evaluation with application for flow control

Ali, Hasan H.

doi:10.32469/10355/63605

Cited by 3 publications

(4 citation statements)

References 53 publications

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“…The resulting dimensionless equations may be expressed as follows, (9) multiply Eq. ( 9) by (10) Let (11) Substituting Eq. ( 11) into Eq.…”

Section: Letmentioning

confidence: 99%

“…PID and H∞ controllers are designed to control the position and velocity of the system. In [11], a speed control system using an inlet throttling valve-controlled pump was proposed. To improve the stability and performance of the system, the stability and performance of open and closed loop speed control systems have been investigated using PID, H∞, and multi-degrees of freedom controllers.…”

Section: Introductionmentioning

confidence: 99%

“… show the requirements described in Equations (52-54). Figure(11) shows that the both the PID and H∞ controllers meet in nominal stability and robust stability requirements where for each controller is less than 1 over the entire frequency range. In addition, both controllers satisfy the nominal performance as shown in Figure12.…”

mentioning

confidence: 99%

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A Robust Controller Design for an Inlet Throttling Speed Control System for a Rotary Actuator

2024

IJOMAM

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In this paper, a novel flow control strategy which is the inlet throttled pump was used to design an angular velocity control system for rotary actuator. Inlet throttled systems have good performance in addition to their high efficiency compared to traditional valve-controlled systems. The flow in the proposed system is adjusted by a valve that is positioned at the pump inlet with the purpose of reducing the energy loses across the valve. This regulated flow is used then to control the actuator angular velocity. The system was modeled and the open loop stability and performance were studied. In order to improve the system performance, proportional-integralderivative (PID) and H-infinity controllers have been designed. The multiplicative uncertainty was analyzed to assess the robustness of the feedback control system where six parameters were considered uncertain within a range of +10%. The robust stability and performance requirements of the closed-loop angular velocity control system were assessed in the frequency domain. The time response of the system showed that the system is stable with both PID and H-infinity controllers. The PID controller have the advantages of simplicity and high response speed while the H∞ controller provides better nominal performance, robustness, and stability. The H∞ controller can handle parametric uncertainty without requiring pure integral term which is a significant advantage over the PID controller. On the other hand, the PID controller falls short of achieving robust performance, making it less suitable for systems that require high levels of performance and robustness. In summary, the H∞ controller is a more comprehensive solution for ensuring the best performance of a system. In contrast, the PID controller may be more suitable for systems with less stringent performance requirements.

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“…The resulting dimensionless equations may be expressed as follows, (9) multiply Eq. ( 9) by (10) Let (11) Substituting Eq. ( 11) into Eq.…”

Section: Letmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Robust Controller Design for an Inlet Throttling Speed Control System for a Rotary Actuator

2024

IJOMAM

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“…In 2016, Wisch presented his PhD thesis, which focuses on the dynamics and efficiency of an inlet-metered pump [97]. The following year, Ali presented his PhD thesis [5] on efficiency and system implementation. Conclusions include that the efficiency is worse than for a conventional pump (which was not anticipated), but that the dynamic response is satisfactory.…”

Section: Inlet Meteringmentioning

confidence: 99%

Classification and Review of Variable Displacement Fluid Power Pumps and Motors

Kärnell

Ericson

2023

TJFP

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Displacement control of positive displacement machines has been a part of fluid power since the early days. Some of the early hydraulic presses already used two different displacement settings, though this was realised by using two different pumps rather than changing the displacement. Later, radial motors with variable stroke length appeared, followed by other designs of variable machines, such as swashplate machines, bent-axis machines, and variable vane machines. All these solutions control the displacement by varying the volume difference of the displacement element – but there are other ways of achieving this. Most have not passed the research state, but some are commercially available. In this paper, different ways of varying the displacement are presented and classified. The classification divides concepts into either control of displaced fluid or control of usage of displaced fluid. In turn, these concepts can be either on system level or displacement element level. This results in four main classes, which to some extent can describe the characteristics of the control.

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IJFP-2018-0015 - Robust Control Design for an Inlet Metering Velocity Control System of a Linear Hydraulic Actuator

Ali

Fales

2020

TJFP

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In this paper, we consider a hydraulic system in which the velocity is controlled using an inlet-metered pump. The flow of the inlet-metered pump is controlled using an inlet metering valve that is placed upstream from a fixed displacement check valve pump. Placing the valve upstream from the pump reduces the energy losses across the valve. The multiplicative uncertainty associated with uncertain parameters in an inlet metering velocity control system is studied. Six parameters are considered in the uncertainty analysis. Four of the parameters are related to the valve dynamics which are the natural frequency, the damping ratio, the static gain, and the time delay. The other two parameters are the discharge coefficient and the fluid bulk modulus. Performance requirements for the system are described in the frequency domain. Frequency domain analysis is used to determine if the closed-loop velocity control system has robust performance. The time response of the nominal system with PID and H∞ controllers were found to be similar. The H∞ controller was found to have the advantages of robust performance when considering the parametric uncertainty while not requiring integral control as in the PID control system. The PID system did not achieve robust performance.

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Inlet metering pump analysis and experimental evaluation with application for flow control

Cited by 3 publications

References 53 publications

A Robust Controller Design for an Inlet Throttling Speed Control System for a Rotary Actuator

A Robust Controller Design for an Inlet Throttling Speed Control System for a Rotary Actuator

Classification and Review of Variable Displacement Fluid Power Pumps and Motors

IJFP-2018-0015 - Robust Control Design for an Inlet Metering Velocity Control System of a Linear Hydraulic Actuator

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