Impact of Long Hydraulic Pipeline upon Performance of Hydraulic Control System

2011 ◽  
Vol 328-330 ◽  
pp. 2148-2151
Author(s):  
Ya Nan Zhao ◽  
Hong Wang Du ◽  
Yu Mei Li ◽  
Xiang Luo ◽  
Gang Liu
Keyword(s):  
Pressure Sensors ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Hydraulic Control ◽  
Relief Valve ◽  
Supply Pressure ◽  
Directional Control ◽  
Cylinder Piston ◽  
The Impact ◽  
Directional Control Valve

In ocean exploitation, long hydraulic pipelines are usually applied. Using SimHydraulic software, the model of hydraulic system including hydraulic fluid, pump, hydraulic cylinder, directional control valve, relief valve, accumulator, long supply pipeline and return pipeline, is established. The position of the cylinder piston is measured by position sensor, while the supply pressure of the cylinder and the system supply pressure are measured by pressure sensors, the directional control valve is controlled by an on-off signal. The simulation was carried out, the impact of long hydraulic pipeline on system performance is also analyzed.

Positioning control of hydraulic cylinder with unknown friction using on/off directional control valve

2018 ◽  
Vol 232 (8) ◽  
pp. 983-993 ◽  
Author(s):  
Liyang Jin ◽  
Qingfeng Wang
Keyword(s):  
Predictive Models ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Switching Frequency ◽  
Control Input ◽  
Positioning Control ◽  
Switching Law ◽  
Directional Control ◽  
Control Scheme ◽  
Directional Control Valve

In this study, a prediction-based positioning control scheme is proposed for the hydraulic cylinder controlled by a solenoid operated on/off directional control valve. The discrete-valued input, low switching frequency and significant delay of directional control valve make the control problem very complex. Only a discrete-valued control input can be used here; meanwhile, the input has switching frequency constraint and time-delay. Existing methods such as pulse-width modulation control and sliding-mode control are not suitable for this problem, because chattering may arise due to the control input restrictions. The newly proposed prediction-based positioning control scheme consists of two parts: a switching law based on predictions of future states and learning algorithms which learn required predictive models online. According to accurate predictions, the switching law can control the hydraulic cylinder to target position in an optimal way, and chattering is avoided. Meanwhile, the required predictive models are identified by a generalized growing and pruning for radial basis function network and a recursive least square estimation algorithm in real time. Essentially, the problems caused by input restrictions, time-delay and model uncertainty are solved by the accurate identifications to some well-designed models. The control scheme is verified by physical experiments. Fast and accurate positioning control can be achieved for the hydraulic cylinder with unknown nonlinear friction.

scholarly journals DYNAMICS OF PROPORTIONAL SPEED CONTROL VERSUS SERVO SPEED CONTROL OF A HOSE / CABLE SPOOLING DEVICE FOR WINCH

2020 ◽  
Vol 61 (2) ◽  
pp. 350-359
Author(s):  
Alexandru-Polifron Chirita ◽  
Marian Blejan ◽  
Teodor-Costinel Popescu ◽  
Ana-Maria Popescu
Keyword(s):  
Closed Loop ◽  
Dynamic Performance ◽  
Control Valve ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Directional Control ◽  
First Case ◽  
Control Versus ◽  
And Control ◽  
Directional Control Valve

This article presents and analyses in two cases the dynamic performance of regulation and control of the linear speed of an electro-hydraulically driven mechatronic axis. In the first case, the flow control is performed with a proportional hydraulic directional control valve, while in the second case the control is performed with a servo-valve. The linear mechatronic axis is part of a complex subsystem used in both agriculture and industry, that allows the precise winding of a hose / cable on a drum with the help of a spooling device, which conditions the positioning of the hose. The speed control of the hydraulic cylinder with bilateral rod on whose liner the spooling device is fixed is performed in a closed loop with the help of transducers and a programmable controller (PLC).

scholarly journals Development and Control of an Electro-Hydraulic Actuator System for an Exoskeleton Robot

2019 ◽  
Vol 9 (20) ◽  
pp. 4295 ◽  
Author(s):  
Dongyoung Lee ◽  
Buchun Song ◽  
Sang Yong Park ◽  
Yoon Su Baek
Keyword(s):  
Gait Cycle ◽  
Sliding Mode ◽  
Control Valve ◽  
Hydraulic Cylinder ◽  
Hydraulic Actuator ◽  
Directional Control ◽  
Robot Systems ◽  
Actuator System ◽  
And Control ◽  
Directional Control Valve

Exoskeleton robots have been developed in various fields and are divided into electric and hydraulic exoskeletons according to the actuator type. In the case of hydraulic robots, because a unidirectional pump is applied, there are limitations to the wearer’s walking. In addition, robot systems are complicated, because a directional control valve is required to change the direction of the actuator. To solve these problems, we designed the electro-hydraulic actuator (EHA) system which has both the hydraulic and electric advantages. The EHA system consists of a hydraulic bidirectional pump, a motor, a hydraulic cylinder, and various valves. For the development of the piston pump, we analyzed the gait cycle and considered the flow rate and pulsation rate. In order to reduce the size and weight of the EHA system, the valves were made from one manifold, and the hydraulic circuit was simplified. We verified that the developed EHA system is applicable to robots through position and force control experiments. Because the hydraulic system is nonlinear, we designed a sliding mode control (SMC) and compared it with the proportional integral derivative (PID) controller.

scholarly journals The Characteristic Improvement of Electromagnetic Proportional Directional Control Valve

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Hua Zhang
Keyword(s):  
Temperature Rise ◽  
Electromagnetic Force ◽  
Optimization Design ◽  
Control Valve ◽  
Hydraulic Control ◽  
The Finite Element Method ◽  
Directional Control ◽  
Burn Out ◽  
High Temperature Rise ◽  
Directional Control Valve

The electromagnetic proportional directional control valve is widely used in hydraulic control system and its typical faults are not enough electromagnetic force and too high temperature rise to burn out the coil. The magnetic field and coil temperature field distribution of the control valve are modeled and analyzed by using the finite element method. The influence laws of the geometry and parameters on electromagnetic force are analyzed. Furthermore, the influence of coil control current and heat transfer coefficient on the temperature rise of coil is analyzed, which provides a theoretical basis for the reliability optimization design of electromagnetic proportional directional control valve.

scholarly journals Dynamic behaviour of pneumatic actuators in open-loop controlled by proportional valves

2020 ◽  
Vol 180 ◽  
pp. 04012
Author(s):  
Valentin Nicolae Cococi ◽  
Carmen-Anca Safta ◽  
Constantin Călinoiu
Keyword(s):  
Control Valve ◽  
Open Loop ◽  
Pneumatic Actuator ◽  
Control Technique ◽  
Hydraulic Control ◽  
Pneumatic Actuators ◽  
Pneumatic Control ◽  
Directional Control ◽  
New Generation ◽  
Directional Control Valve

The development of proportional and servo-mechanisms hydraulic control technique offered the premises of the development of pneumatic control, too. Despite the disadvantages of the nonlinearities appeared in the pneumatic systems (air compressibility being one of the causes), the new generation of proportional equipment made it possible to have a good quality pneumatic control system in our days. The goal of the paper is to demonstrate, by using numerical simulation technique, that the proportional valves used in pneumatic actuator drives occur at a good system dynamic at a reasonable cost as against to the directional control valve as it usually used in pneumatic actuator drives.

Improved Design and Analysis of Hydraulic Impact Hammer Based on Virtual Prototype Technology

2011 ◽  
Vol 48-49 ◽  
pp. 607-610 ◽  
Author(s):  
Guo Ping Yang ◽  
Bo Chen ◽  
Jun Hao Gao
Keyword(s):  
Control Valve ◽  
Virtual Prototype ◽  
Prototype Model ◽  
Hydraulic Impact ◽  
Directional Control ◽  
Development Cycle ◽  
Virtual Prototype Technology ◽  
Improved Design ◽  
The Impact ◽  
Directional Control Valve

The impact mechanism of the traditional hydraulic hammer is composed of the directional control valve and the main cylinder body. Due to the two parts damaged in different situation at work, the replacement of equipment resulted in unnecessary waste. Based on the design concept of virtual prototype technology, the virtual prototype model of improved hydraulic impactor was established with CATIA software and the directional control valve separated from the main cylinder body, in addition, the kinematics properties of the hydraulic impactor were simulated and analyzed by the dynamic simulation function of CATIA. The virtual prototype technology can reduce the input for the mock-up and Prototype, shorten the development cycle of the products and it is conducive to realize the optimal design or deformation design of products.

DYNAMICS OF PROPORTIONAL SPEED CONTROL VERSUS SERVO SPEED CONTROL OF A HOSE / CABLE SPOOLING DEVICE FOR DRUM

2020 ◽  
pp. 379-388
Author(s):  
Alexandru-Polifron Chirita ◽  
Marian Blejan ◽  
Teodor-Costinel Popescu ◽  
Ana-Maria Popescu
Keyword(s):  
Closed Loop ◽  
Dynamic Performance ◽  
Control Valve ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Directional Control ◽  
First Case ◽  
Control Versus ◽  
And Control ◽  
Directional Control Valve

This article presents and analyses in two cases the dynamic performance of regulation and control of the linear speed of an electro-hydraulically driven mechatronic axis. In the first case, the flow control is performed with a proportional hydraulic directional control valve, while in the second case the control is performed with a servo-valve. The linear mechatronic axis is part of a complex subsystem used in both agriculture and industry that allows the precise winding of a hose / cable on a drum with the help of a spooling device, which conditions the positioning of the hose. The speed control of the hydraulic cylinder with bilateral rod on whose liner the spooling device is fixed is performed in a closed loop with the help of transducers and a programmable controller (PLC).

scholarly journals Research of the automated drive of manual hydraulic valves of the manipulator

2017 ◽  
Vol 6 (4) ◽  
pp. 194-201
Author(s):  
Бухтояров ◽  
Leonid Bukhtoyarov ◽  
Лысыч ◽  
Mikhail Lysych ◽  
Туровский ◽  
...  
Keyword(s):  
Control Valve ◽  
Theoretical Research ◽  
Hydraulic Control ◽  
Directional Control ◽  
Solid Works ◽  
The Cost ◽  
Aided Design ◽  
Drive Model ◽  
Hydraulic Valves ◽  
Directional Control Valve

The authors offer an automated drive design based on stepper motor which is mounted directly on the hydraulic control valve with manual control. This approach eliminates rework most of the hydraulic system, which significantly reduces the cost and the complexity of the process of modernization. When the drive was planning to use the medium-aided design SolidWorks. Within the theoretical research car-ried out kinematic and dynamic issledovaniyaprotsessa with joystick control. For this purpose calculated 3D-drive model with a directional control valve and the application for engineering calculations Solid-Works Simulation.

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