On the Application of Oleo-Pneumatic Accumulators for the Protection of Hydraulic Transmission Lines Against Water Hammer—A Theoretical Study

Rabie, M. G.

doi:10.1080/14399776.2007.10781266

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…The test stand consists of a base (1) to which a hydraulic cylinder (2) is attached. The body is attached to the end of the actuator piston rod, which is connected to a linear guide (3). Such a combination allows for blocking the rotation of the actuator piston rod and causes linear movement of the actuator.…”

Section: Linear Rotary Electro-hydraulic Servo Drive Unitmentioning

confidence: 99%

“…Thanks to the fact that the drive system built for their use is relatively simple, they have a low failure rate and are often cheaper than an equivalent electric servo drive. The basic knowledge of hydraulic components and drives has been described by many authors, for example, Murrenhoff [1], Chapple [2], Rabie [3], Backe [4] or Akers [5]. The electrohydraulic servo drive is an automatic control system in which the output signal, i.e., the displacement of the cylinder piston rod, follows the input signal.…”

Section: Introductionmentioning

confidence: 99%

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Design and Control of a Linear Rotary Electro-Hydraulic Servo Drive Unit

2023

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In this paper, a new solution for an electro-hydraulic servo drive is proposed, which consists of two electro-hydraulic servo drives: one with a hydraulic cylinder and one with a hydraulic rotary motor. In the proposed drive, the linear actuator is attached to a horizontal base and the hydraulic motor is mounted on the actuator piston rod. Thus, the output signal of the drive is the lifting and lowering of the element suspended on the rope. The paper describes the structure, kinematics, dynamics, and control of a novel electro-hydraulic servo drive. A servo valve and a proportional valve are used to control the flow of the hydraulic cylinder and the hydraulic motor. Special attention is paid to the construction of two actuators in one drive unit. The controller is based on the PLC controller. The measuring system uses laser displacement sensors and an encoder. The results of laboratory investigations are discussed in the paper. The proposed drive contains all of the characteristics of a mechatronic device. The main contribution of this study is the proposal of the controller architecture and the algorithm to control the speed and position when lifting or lowering loads.

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Section: Linear Rotary Electro-hydraulic Servo Drive Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Control of a Linear Rotary Electro-Hydraulic Servo Drive Unit

2023

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“…This paper focuses on utilizing gas-charged bladder type hydraulic accumulators as a passive device to decrease flow and pressure ripple. The application of these components to reduce fluid borne noise and flow irregularities in hydraulic systems is well established [16,17]. In a fluid filled line, an accumulator acts as a low-pass filter by storing or supplying the excess or lack of fluid to compensate for sudden peaks, whether positive or negative, that may occur in the flow.…”

Section: Introductionmentioning

confidence: 99%

Application of a hydraulic gas bladder suppressor for pressure ripple reduction in gear pumps

Casoli,

Vescovini

2023

J. Phys.: Conf. Ser.

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Gear pumps are widely employed in hydraulic circuit but they carry the major drawback represented by the pulsating flow they produce. To improve the capability of the pump to produce a clean and smooth flow rate, many methods have been investigated over time: from the optimization of pump features itself to the introduction of additional systems on the pump delivery side. One system that has demonstrated to be particularly effective is the in-line bladder hydraulic pulsation suppressor, which is part of the passive systems category. This device consists of a bladder gas accumulator with a particularly clever geometry and is the focus of many studies. The study illustrated in this paper has the aim of proposing a lumped parameter model capable of predicting the hydraulic suppressor ripple reduction performance. To test the actual performance of the suppressor and validate the lumped parameter model, an experimental study was conducted, which demonstrated the good effectiveness of device, while a good agreement between modeling results and experimental data was obtained.

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“…Solving common differential equations makes considerably fewer difficulties in comparison with solving partial differential equations. Of course, in modeling the long transmission line by means of the model with lumped parameters, the transmission line should be divided into a necessary number of segments so that the influence of its dynamic behavior on the behavior of the whole system could be covered [1,5,6,11,19].…”

Section: Introductionmentioning

confidence: 99%

Design of constant gain controllers for the hydraulic control system with a long transmission line

Nedić

Dubonjić

Filipović

2011

Forsch Ingenieurwes

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The paper presents the problems of describing the system of a pump-controlled motor with a long transmission line by means of a mathematical model with lumped parameters where the long transmission line is divided into n segments. The mathematical model thus obtained is of high order but its order is reduced by applying the appropriate methodology, which considerably increases its use value. A P controller was designed for that mathematical model of the system. The graphical method which includes performances (specification of damping of the system) and stability margins was used in the design. Thanks to strong software support, the complexity of synthesis of controllers was considerably reduced in comparison with the methods presented in the literature. Dynamic behavior of the closed loop system was treated in intensive simulation. The methodology applied provides significant energy savings. penbetriebenen Motors mit einer langen hydraulischen Leitung vorgestellt. Das entwickelte mathematische Modell hö-herer Ordnung wird derart vereinfacht, dass seine Handhabung deutlich vereinfacht wird. Für dieses System wird ein P-Regler verwendet. Für den Entwurf wird eine graphische Methode benutzt, die die Kennlinien unter Angabe der Dämpfung des Systems und die Randstabilität einbezieht. Dank der Softwareunterstützung wurde die Komplexizität der Reglersynthese, im Vergleich zu bekannten Methoden der Literatur, bedeutend reduziert. Mit einer intensiven Modellierung wurde das dynamische Verhalten des Systems in einer geschlossenen Kopplung betrachtet. Die Methodologie, die angewendet wurde, ermöglicht bedeutende Energieersparnisse. List of symbolsA (m 2 ) cross section area A L , B L , C L , D L coefficients of the transfer matrix a i , a k , b k coefficients of the transfer function B (N m −2 ) module of compressibility B v (N m s) friction viscosity C (m 4 N −1 ) capacity of the transmission line C 1 (m 5 N −1 ) capacity of the transmission line C m , C p (m 5 N −1 ) capacity of the motor and the pump c (m s −1 ) speed of sound in the fluid D m , D p (m 3 rad −1 ) motor and pump displacement d (m) diameter of the transmission line E (N m −2 ) equivalent module of elasticity (fluid-pipe) g m gain margin J m (kg m 2 ) motor load inertia K a (m 3 V −1 rad −1 ) coefficient voltage-pump displacement K p gain P controllers K T G (V s rad −1 ) coefficient of the tacho-generator 232 Forsch Ingenieurwes (2011) 75:231-242 L (kg m −5 ) inductivity of the transmission line L 1 (kg m −4 ) inductivity of the transmission line l (m) length of the transmission line n number of segments of the long transmission line n p (rps −1 ) number of revolutions of the pump p 1 , p 2 , p n (Pa) pressure Q 1 , Q 2 , Q n (m 3 s −1 ) flow R (N s m −6 ) resistance of the transmission line R 1 (N s m −5 ) resistance of the transmission line R m , R p (N s m −5 ) resistance leakage of the motor and the pump s complex number s m stability margin T L (N m) external load T (ξ), U(ξ) Chebyshev functions of the first and second kinds t (s) time V (m 3 ) volum...

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On the Application of Oleo-Pneumatic Accumulators for the Protection of Hydraulic Transmission Lines Against Water Hammer—A Theoretical Study

Cited by 15 publications

References 2 publications

Design and Control of a Linear Rotary Electro-Hydraulic Servo Drive Unit

Design and Control of a Linear Rotary Electro-Hydraulic Servo Drive Unit

Application of a hydraulic gas bladder suppressor for pressure ripple reduction in gear pumps

Design of constant gain controllers for the hydraulic control system with a long transmission line

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