The Design of Comprehensive CAT Test Rig for Electro-Hydraulic Servo Valve

By comparing the limitation of traditional test rig for electro-hydraulic servo valve and the advantages of CAT test rig for electro-hydraulic servo valve, this paper demonstrates an overall CAT test rig design including hydraulic system design and test software design. This work applies virtual instrument technology based on LabVIEW and adopts OPC standard to realize real-time communication between computer and PLC. Eventually as a case study, a test example of a well-functional servo valve is presented to show the validity and accuracy of the test rig.

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

Volume 4A: Dynamics, Vibration and Control ◽

10.1115/imece2013-65239 ◽

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.

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1P2-C06 Development of the durability servo valve for water hydraulic system : Design proposal of servo valve structure, and the quality of the material and a surface treatment(Eco Green Mechatronics)

The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) ◽

10.1299/jsmermd.2014._1p2-c06_1 ◽

2014 ◽

Vol 2014 (0) ◽

pp. _1P2-C06_1-_1P2-C06_2

Author(s):

Kiyoshi SAKAMOTO ◽

Yugo ITO ◽

Toshiyuki SUGIYAMA ◽

Takeo OOMICHI

Keyword(s):

Surface Treatment ◽

System Design ◽

Hydraulic System ◽

Servo Valve ◽

Valve Structure ◽

Water Hydraulic ◽

Hydraulic System Design ◽

Design Proposal

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Research on the Impact Pressure of the Hydraulic Rolling-Cut Shear

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.145.410 ◽

2010 ◽

Vol 145 ◽

pp. 410-413 ◽

Cited By ~ 3

Author(s):

Jing Wang ◽

He Yong Han ◽

Qing Xue Huang ◽

Jun Wang

Keyword(s):

Hydraulic System ◽

Impact Pressure ◽

Direct Impact ◽

Actual Situation ◽

Work Situation ◽

Servo Valve ◽

Indirect Impact ◽

Hydraulic Servo ◽

Hydraulic Servo System ◽

The Impact

The reasons for impact pressure are obtained by the research the hydraulic system of Hydraulic Rolling-Cut Shear. The impact pressure of hydraulic system is divided into direct impact and indirect impact. Based on analyzing the actual situation the measures should be taken to reduce the impact pressure when design hydraulic system. The suitable length of pipeline can improve the performance of the hydraulic system because the length is important for the impact pressure. The accumulator can absorb impact pressure and improve the work situation of servo valve. Therefore, the suitable accumulators should be set in the hydraulic system. The study provides theory basis for the pipe design of large hydraulic servo system.

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The Research on Rake-Car’s Driving System of Ore Reclaimer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.300-301.10 ◽

2013 ◽

Vol 300-301 ◽

pp. 10-13

Author(s):

Yuan Hui Li ◽

Kui Sheng Chen ◽

Jiang Hong Deng ◽

Xin Yuan Chen

Keyword(s):

Computer Simulation ◽

System Design ◽

Failure Rate ◽

Hydraulic System ◽

Driving Mechanism ◽

Connecting Rod ◽

Driving System ◽

Final Design ◽

Hydraulic System Design ◽

Working Situation

Rake-car’s driving system of ore reclaimer originally used crank and connecting rod mechanism as driving mechanism. The driving mechanism got some trouble that parts got severe wear and failure rate of mechanism was high. The hydraulic system is used to drive rake car in view of hydraulic driving system’s advantage. By analysis on existing problem of crank and connecting rod mechanism, the actual working load of equipment is tested and the working situation is analysed. The working situation of the hydraulic system is also analysed by computer simulation. By optimization of the hydraulic system design, the final design is determined. The whole system is actually used. It works well.

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