scholarly journals Study on Electro-hydraulic Servo Valve Control System of Series Manipulator

2017 ◽  
Vol 10 (3) ◽  
pp. 289-302
Author(s):  
Zhang Daode ◽  
Yan Pian ◽  
Wang Zhouxing ◽  
Wu Yuan
Keyword(s):  
Control System ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Valve Control

The Effects of Orifice Sizes on a Hydraulic Servo Valve Control System

2013 ◽  
Author(s):  
Marshall McNea ◽  
Shanzhong (Shawn) Duan
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Pressure Pulse ◽  
Dynamical Behavior ◽  
Servo Valve ◽  
External Orifice ◽  
Hydraulic Servo ◽  
Hydraulic System Design ◽  
Valve Control ◽  
Orifice Size

Precision control for a force controlled hydraulic system can be achieved through the use of a flow controlled servo valve. Servo valves can be manufactured with a spool that is overlapped, an under lapped, or has a zero lap. A servo valve with a zero lap is desirable for a responsive hydraulic system without leakage, but has the disadvantage of creating a pressure pulse upon opening the valve. The hydraulic system for this setup involves having a double end, double action actuator that will have a cyclic motion generating multiple pressure waves in the system. Including an orifice in the system, which will function as a dampener, can reduce the pressure pulses. Traditional locations for orifices have been in the spool and on the actuator piston. For this hydraulic system design an external orifice will be introduced into the system via the use of an orifice plate included in the hydraulic fittings. This change allows for the ability to change the orifice size. Changing the orifice size to determine the effects on the systems control will be analyzed. The intended outcome is to demonstrate that different sized orifice plates will cause changes to the control system behavior so that an experimental formula will be established for this approach of a zero lap valve with an external damper for reduction of overshooting of dynamical behavior of the valve spool.

Performance Improvement of Electro-Hydraulic Servo Valve Using a Feed-Forward Control and an Input Shaping Filter

2019 ◽  
Author(s):  
Illyeong Lee ◽  
Istanto Iwan ◽  
Saeryung Choi ◽  
Junyoung Huh
Keyword(s):  
Control System ◽  
Displacement Sensor ◽  
Input Shaping ◽  
Hydraulic Control ◽  
Control Performance ◽  
Hydraulic Systems ◽  
Servo Valve ◽  
Shaping Filter ◽  
Feed Forward Control ◽  
Hydraulic Servo

Abstract The control performance of hydraulic systems is basically influenced by the performance of electro-hydraulic servo valve used in a hydraulic control system. In this study, the authors propose a control design to improve the control performance of servo valves with a non-contact eddy current type displacement sensor. Mathematical model for the valve is obtained through an experimental identification process. A PI-D controller together with a feedforward (FF) controller is applied to the valve. To further improve the response of the servo valve, an input shaping filter (ISF) is incorporated into the valve control system. Finally, the effectiveness of the proposed control system is verified experimentally.

Research on Flow Press Servo-Valve Controlling Electro-Hydraulic Force Control System and Nonlinear Performance Analysis

2011 ◽  
Vol 121-126 ◽  
pp. 4606-4612 ◽  
Author(s):  
Jian Ying Li ◽  
Jun Peng Shao ◽  
Xiao Jing Wang ◽  
Bai Qin ◽  
Yu Jing Qiao
Keyword(s):  
Control System ◽  
Force Control ◽  
System Performance ◽  
Mathematic Model ◽  
Basic Theory ◽  
Servo Valve ◽  
Hydraulic Force ◽  
Force Control System ◽  
Hydraulic Servo ◽  
Simulation And Experiment

The configuration and the work principle of the flow press hydraulic servo-valve was introduced in this paper, based on this and electromagnetic basic theory, the mechanics analysis of every main parts of the flow press hydraulic servo-valve and the liquid basic theory especially the flow continuity equation, the mathematic model of the flow press sever-valve was built, during the process of building the model, the author took into account the load moment brought by the pair of spray nozzles flow force and the load moment brought by the force couples back pole and the fundamental equation of the force moment motor. On the other hand, the author analyzed the influence of the nonlinear factor to system performance, and the nonlinear factor was valve port overlap length disaccord caused by machining error. The mathematic model of the electro-hydraulic force control system controlled by the flow press servo-valve with valve port error was built. The results of simulation and experiment showed that valve port error badly influenced the system performance, and that valve port error was the main reason of the pressure higher than the supply pressure, which is one of the two cylinder cavities. The simulation curve and the experiment curve were accord compared by system simulation and experiment results, so we can know that the mathematic model of the flow press sever-valve and of the electro-hydraulic force control system controlled by the flow press servo-valve is correct.

Implementation of Precision Force Control for an Electro-Hydraulic Servo Press System

2012 ◽  
Vol 190-191 ◽  
pp. 806-809 ◽  
Author(s):  
Hong Ming Chen ◽  
Chun Sheng Shen ◽  
Ting En Lee
Keyword(s):  
Control System ◽  
Force Control ◽  
Force Sensor ◽  
Hydraulic Cylinder ◽  
Relief Valve ◽  
Servo Valve ◽  
Composite Control ◽  
Servo Press ◽  
Control Scheme ◽  
Hydraulic Servo

Based on the fuzzy method, a PC-based precision force control scheme is proposed for the electro-hydraulic servo press system. The main feature of proposed scheme is to develop a composite control of relief valve and flow servo valve. With the feedback of force sensor, the fuzzy-based control system is realized by LabVIEW for achieving the precision force control of hydraulic cylinder. In the experiments, a practical platform of hydraulic servo press system is used to demonstrate the effectiveness of proposed scheme. The testing results indicate the accurate output responses.

Development of the Control Section for a New Armature Components Assembly Machine and its Application Test

2012 ◽  
Vol 522 ◽  
pp. 373-377
Author(s):  
Bin Li ◽  
Dong Xiang Shao ◽  
Guang Lin Wang ◽  
Hui Feng Wang
Keyword(s):  
Control System ◽  
Electronic Control ◽  
Core Component ◽  
Servo Valve ◽  
The Core ◽  
Assembly Accuracy ◽  
Electronic Control System ◽  
The Press ◽  
Hydraulic Servo ◽  
Control Section

The armature components are the core component of the electro-hydraulic servo valve [. Its manufacturing and assembly accuracy directly affects the performance of the servo valve. The domestic existing electro-hydraulic servo valve armature assembly pressure equipment is so far behind that it is difficult to meet production requirements. For the needs of a servo valve production firm, authors department developed the armature components automatically press machine. In order to achieve automation and intelligent of press process, this article supports a electronic control system for the press machine to further improve its ability. And on the basis of certain experiments, the author proves the good performance of the pressure machine.

Combined Test of Capacity Regulating in 1100kV Controlled Shunt Reactor Valve-Control System

2014 ◽  
Vol 977 ◽  
pp. 334-337
Author(s):  
Xi Lei ◽  
Gui Zhi Xu ◽  
Ke Zheng Xing
Keyword(s):  
Control System ◽  
Test Method ◽  
System Stability ◽  
Shunt Reactor ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Combined Test ◽  
Controlled Shunt Reactor ◽  
Ac Transmission ◽  
Valve Control

As a flexible AC transmission system equipment, controlled shunt reactor is becoming increasingly important in the grid with the development of EHV / UHV transmission systems. Since currently rated voltage of controlled shunt reactor has developed to 1100kV, as its capacity control system, or valve-control system, stability and reliability test is very important. In this paper, the test circuit and method for the valve-control system in the laboratory or the test station for combined adjustment test is put forward. By adjustment of power supply and the device parameter, the valve-control system can put the voltage and current of the device to be the same as the on-set operation. Actual test of the world's first 1100kV controlled shunt reactor valve-control system shows that, the test method in this paper is correct and feasible, and the objective of assessment can be achieved.

A Hydraulic Control System Design for Change-Wheel Garage of Light Rail Based on PLC

2012 ◽  
Vol 233 ◽  
pp. 76-79
Author(s):  
Yong Gang Yang ◽  
Jun Sun ◽  
Meng Tao Yang
Keyword(s):  
Control System ◽  
System Design ◽  
Servo Control ◽  
Light Rail ◽  
Control System Design ◽  
Hydraulic Control ◽  
Plc Control ◽  
Servo Control System ◽  
Hydraulic Servo ◽  
Hydraulic Control System

This paper introduces the hydraulic control system design for the change-wheel garage of Chongqing light rails through analysis of three-stage cylinder synchronization circuit for lifting bodies, and optimizing the design of the slewing mechanism with respect to the hydraulic servo control system of digital cylinder. The results improved the smoothness in the process of changing wheel lifting and the rotary accuracy of the rotary mechanism. Design on the PLC control system of the system is also included as part of this paper.

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