Development of Stand-Alone Type Hydraulic Actuator for Valve Remote Control System
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Abstract:
In the case of hydraulic power system of ships or marine facilities, many kinds of mechanical, electrical, hydraulic components are connected to each other very complicatedly. It is very hard to disassemble or reconfigure the hydraulic system. Therefore there are increasing demands from industry for a stand-alone type actuator and a valve remote control system. Valve remote control system (VRCS) is a convenient system which it possible to operate the valves installed in the cargo or ballast tanks from the remote wheelhouse. This paper is dealing with a new stand-alone type hydraulic actuator for a valve remote control system. The stand-alone type hydraulic actuator consists of a gear pump, an AC motor, a check valve, a relief valve and a controller. We try to design and implement the stand-alone type hydraulic actuator and this tries to be verified through an experiment. This research is a contribution to simplify a hydraulic system, improve responsibility of dynamic power system, and reduce an energy loss in a ships or marine facilities.Keywords:
Electro-hydraulic actuator
Valve actuator
Control valves
Ballast
Rotary actuator
Electrohydraulic servo valve
The performance of high speed electro-hydraulic actuator applied to piston variable displacement compressor was analyzed.According to the slow response of electro-hydraulic actuator driven by single high speed on/off valve,which was leaded by the restrained volume of high speed on-off valve,the solution that using a high speed on-off valve as the pilot valve and a secondary valve as the distributing valve was presented.The simulation results indicate that the high speed electro-hydraulic actuator response time fit practical work conditions.At the same time,the pilot structure of high speed electro-hydraulic actuator makes it possible to control open-close of distributing valve only by exporting one on/off signal on the high speed on/off valve.This solution improves system stability,decreases number of electro-valves,compared with multi-valve control method.
Valve actuator
Electrohydraulic servo valve
Valve timing
Piston (optics)
Electro-hydraulic actuator
Rotary actuator
Hydraulic circuit
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In the paper the investigations performed at the Division of Mechtronic Devices at Poznan University of Technology in the area of application of both: smart materials in electro-hydraulic and electro-pneumatic valves, and new methods to control of hydraulic servo drives, are presented. In a first part the piezo bender actuator is shortly described and its application in servo valve is proposed. This actuator replaced the torque motor in the available on the market servo valve. The new valve simulation model is proposed. The simulation and investigations results of the servo valve with the piezo bending actuator are included. In the next part of the paper the application of piezo tube actuator in flapper-nozzle pneumatic valve is described. The test stand and investigations results are presented. Later, in the article, the Model Following Control (MFC) and Fractional order Control (FoC) methods are described. Their application in control of electrohydraulic servo drive is proposed. Some investigations results are included in the paper, showing the advantages of those control methods.
Electrohydraulic servo valve
Rotary actuator
Valve actuator
Pneumatic actuator
Flow control valve
Control valves
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This chapter considers the output device of the hydraulic control system. This device, which the authors call the actuator, is the mechanism that is responsible for delivering force and motion to the external load system of a given application. The chapter considers two actuator types: linear actuators and rotary actuators. It discusses the performance characteristics of linear actuators. These characteristics include a consideration of the actuator efficiency and the quasi-steady operation and function of the actuator. Four hydraulic actuators are used to operate a car lift that is used within an auto mechanic garage. The chapter also discusses the performance characteristics of rotary actuators. The efficiency equations for the rotary actuator (hydraulic motor) are similar to those of the hydraulic pump and the discussion of pump efficiency measurement is also applicable to the efficiency measurement of the hydraulic motor.
Rotary actuator
Electro-hydraulic actuator
Lift (data mining)
Linear actuator
Plant
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Control of the linear hydraulic actuator using the full hydraulic bridge is the main topic of this paper. The Linear hydraulic drives are often used in production machines, technological equipment, robots and manipulators for their high power-mass ratio and ability to manipulate with big masses and produce bid forces by very small velocities. Very often both tasks are required - movement with mass and producing high force, as well as achieving the given position with high accuracy at the end of the trajectory. Also force control can be demanded. The desired properties are realized by the control of the hydraulic drives using the hydraulic circuits with servo valve, and for special functions, additional parts of the hydraulic circuit must be designed and used. The paper presents the control of the hydraulic linear drive using the full hydraulic bridge realized using four proportional valves, which represent four-variable hydraulic resistances controlled by the separate four control signals. The designed and realized hydraulic actuator, control algorithms, control system and results from the experiment on the test rig are introduced in the paper.
Electro-hydraulic actuator
Electrohydraulic servo valve
Hydraulic circuit
Linear actuator
Control valves
Telescopic cylinder
Hydraulic fluid
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VRLA (valve-regulated lead-acid) and Pump-control are the two kinds of power components for hydraulic servo system. With different command device, feedback measurement device and different corresponding electronic components, the hydraulic servo systems are different. To ensure maximum performance of the whole device, the overall design (including mechanical, electrical design) should be considered for hydraulic servo system. Machinery-electric-hydraulic should be in coordination with each other. The hydraulic system components are used to change the speed of hydraulic cylinder and alter direction of hydraulic cylinder and hydraulic motor. The solenoid valve for motor and hydraulic servo system and the control of pressure relay can implement by the electric section.
Electrohydraulic servo valve
Telescopic cylinder
Solenoid valve
Solenoid
Electro-hydraulic actuator
Servomechanism
Control valves
Hydraulic circuit
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정유압 방식 EHA는 종래의 밸브 제어 방식 전기유압 구동장치와 전혀 다른 특성을 나타낸다. 본 논문에서는 EHA의 비선형 요소를 포함한 수학적 모델을 유도하고 실험적으로 검증하였다. 이 수학적 모델을 근거로 전기 모터로 구동되는 유압 펌프, 파이프 배관 그리고 유압 실린더로 구성되는 EHA의 시물레이션 모델을 개발하여 주요 설계 인자인 모터 토크의 피크치, 펌프의 관성 모멘트 등이 제어 성능에 미치는 영향을 분석하였다. 여기에서 실험 조건은 의도적으로 과도기에서 모터 토크가 포화되도록 선정하였다. 그 결과로서 최대 속도로 동작하는 EHA의 제어 정밀도를 개선하기 위한 설계 조건을 조사하였다. The EHA(Electro-hydrostatic Actuator) reveals completely different characteristics from the conventional valve-controlled Electro-hydraulic actuators. In this paper, its mathematical model including nonlinear elements was derived to be verified by experiments. Based on this, a simulation program was developed for the EHAs consisting of an electric motor driven hydraulic pump, pipe lines and a cylinder. The influence of important design parameters such as peak motor torque and rotational inertia moment of the hydraulic pump on control performance was investigated, where the test condition was intentionally selected so that the motor torque was saturated during the transient phase. As a result, design requirements for improving the control accuracy under full speed operation conditions of the EHAs were investigated.
Electro-hydraulic actuator
Rotary actuator
Moment of inertia
Hydrostatic equilibrium
Transient (computer programming)
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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.
Rotary actuator
Electrohydraulic servo valve
Telescopic cylinder
Linear actuator
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Aircraft primary flight control surfaces are typically driven by two linear hydraulic actuators accepting the controlled flows from two independent hydraulic systems. When the actuators are part of a fly-by-wire system, actuators flows are controlled by valves, and a key issue is to ensure a pressure matching between the two actuators to prevent force fighting with a resulting loss of stiffness and dynamic performance. Different solutions have been used to minimize the pressure mismatch between two redundant electro hydraulic actuators, but limited use has been done of techniques based on generating compensation signals to reduce the difference between the pressure differentials of the two servo actuators. The advances in microprocessors computing power offer new possibilities that can be exploited to perform a good pressure matching between redundant actuators by using an appropriate control strategy without the need of a complex hydraulic design. This paper first presents a brief survey of the existing architectures of dual redundant electro hydraulic servo actuators, then describes a research activity performed on this subject. An optimal and robust equalization control strategy was devised, capable of minimizing the force fighting between servo actuators while using conventional electro hydraulic servo valves, thereby leading to appreciable weight and cost savings
Electro-hydraulic actuator
Electrohydraulic servo valve
Rotary actuator
Fluid power
Servomechanism
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This chapter considers the analysis, design, and control of valve-controlled hydraulic systems. The subject of valve-controlled hydraulic systems is most easily divided between the control of linear actuators (hydraulic pistons and cylinders) and rotary actuators (hydraulic motors). The chapter presents three valve-controlled hydraulic systems: the four-way valve-controlled linear actuator, the three-way valve-controlled linear actuator, and the four-way valve-controlled rotary actuator. Each of these hydraulic control systems is analyzed to determine the equation of motion that governs the dynamic behavior of the output load. Once the governing equation has been established the design of the hydraulic system is evaluated using steady-state forms of the governing equation. The chapter also presents various control schemes that may be used for each hydraulic system. These control schemes are classical proportional-integral-derivative controllers that are implemented for achieving position, velocity, and force or torque control of the valve-controlled system.
Rotary actuator
Electro-hydraulic actuator
Valve actuator
Control valves
Linear actuator
Telescopic cylinder
Position (finance)
Electrohydraulic servo valve
Plant
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Electrohydraulic servo valve is the unit of electrical and hydraulic components. Basically it is an electrical operated valve which controls the motion of the hydraulic fluid in the circuit. This valve has the ability to control the heavy and powerful load system or control the motion of an actuator with a very small input in terms of current. Servovalves generally receive pressurized hydraulic fluid from the hydraulic pump. This pressurized fluid is used to control the actuator or load movement and the pressurized fluid is controlled by the input. The major applications of this valve are in the field of heavy industry, military, traffic signal process and aircraft etc. The electrical signal is given into the electrical unit to control the position controller or flapper to drive the pilot stage of the valve. The deflected flapper creates the differential pressure between the two ends of the spool valve which is the cause of spool movement. Hence, the motion of the actuator is initiated. In the book a mathematical model of two-stage two-spool electrohydraulic servovalve is discussed where the pressure difference between the two ends of the valve acts as the feedback element.
Electrohydraulic servo valve
Valve actuator
Rotary actuator
Control valves
Hydraulic circuit
SIGNAL (programming language)
Pneumatic actuator
Servomechanism
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