Performance Analysis of Double Nozzle Flapper Servo Valve Based on Liquid-Solid Couple Effect and Moving Grid Approach

2015 ◽  
Vol 779 ◽  
pp. 13-25
Author(s):  
Dian Rong Gao ◽  
Jian Hua Zhao ◽  
Song Lin Zhou
Keyword(s):  
Flow Field ◽  
Slide Valve ◽  
Flow Coefficient ◽  
Structure Parameters ◽  
Servo Valve ◽  
Advantages And Disadvantages ◽  
Common Structure ◽  
Grid Approach ◽  
Hydraulic Servo ◽  
Couple Effect

When designing the servo valve with different structure parameters, the influence of the interaction between the liquid and the solid on the performance of servo valve can only be obtain by the method of experiment, and then it can increase the time and cost of designing the servo valve. The liquid-solid couple method can obtain the influence of structure parameters on the performance of servo valve under the circumstance of reducing the experimental cost and time. The paper chooses the servo valve of A and B as models for study, The text adopts FSI method to analyze the flow field of double nozzle baffle electro-hydraulic servo valve prestage through the software of ANSYS, research the change of the prestage flow field by deflection of loaded armature baffle components, contrast and analyze the change of velocity, pressure, power loss and flow coefficient of fixed choke, nozzle, return port, and the displacement of the valve core of slide valve, stress of armature baffle components, pressure at both ends of spool. Summarize the advantages and disadvantages of A and B servo valve, and find different parameters of servo valve have different performance, it is difficult to find a common structure and size. It can help us to select the requirement structure by using fluid-structure interaction, reduce experiments and save cost.

Design and Analysis of Slide Valve Used in Water Hydraulic Servo Valve Based on Flow Field Simulation

2010 ◽  
Vol 34-35 ◽  
pp. 1279-1283 ◽  
Author(s):  
Xin Hua Wang ◽  
Jian Zheng ◽  
Wei Li ◽  
Shu Wen Sun
Keyword(s):  
Incidence Angle ◽  
Chemical Properties ◽  
Slide Valve ◽  
Fluid Simulation ◽  
Flow Coefficient ◽  
Design Parameters ◽  
Structure Parameters ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Water Hydraulic

Because of the difference between oil and water in physical and chemical properties, research on the design method of water hydraulic slide valve is important to design the water hydraulic servo valve. Based on the flow fluid simulation of incompressible flow, according to the design parameters of water hydraulic slide valve, CFD software Fluent is used to simulate and analyze the flow characteristics of water hydraulic slide valve. The simulation model of Slide valve with rectangular openings has been built, and different combinations of boundary conditions are specified to make comparisons so as to ensure the correctness of the simulation. The factors which impact the static characteristics of slide valve like the spool opening, flow coefficient, incidence angle have been discussed. The results indicate that the flow designed of the slide valve is approximately proportional to the spool opening by rational selection of structure parameters. The structure parameters of the slide valve that satisfy the design requirements are derived.

Research on Flow Characteristics of Slide Valve Used in Water Hydraulic Servo Valve

2010 ◽  
Vol 29-32 ◽  
pp. 1651-1656 ◽  
Author(s):  
Xin Hua Wang ◽  
Wei Li ◽  
Shu Wen Sun
Keyword(s):  
Flow Characteristics ◽  
Slide Valve ◽  
Structure Parameters ◽  
Important Research ◽  
Boundary Values ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Design Requirements ◽  
Water Hydraulic ◽  
Simulation Results

Water hydraulic servo valve has become an important research subject nowadays, and its secondary amplifier usually uses slide valve. Research on flow characteristics of water hydraulic slide valve is important to the design of water hydraulic servo valve. Based on the classical theory of incompressible flow, CFD software FLUENT is used to simulate and analyze the flow characteristics of water hydraulic slide valve. Simulations with different boundary values are applied to the same slide valve in order to guarantee the accuracy of the simulation results. Detailed comparisons are made between throttles with different structure parameters, including spool diameter, spool opening, flow passage diameter and equalizing slots so as to define the parameters respectively. The results indicate that the flow rate of the slide valve designed is approximately proportional to the spool opening within certain travel. Finally, the structure parameters of the slide valve that satisfy the design requirements are obtained. The simulation results provide theoretical basis for the design and improvement of water hydraulic slide valve used in water hydraulic servo valve.

Visualization of Flow-Field between the Flapper and Nozzle in a Hydraulic Servo-Valve

2011 ◽  
Vol 402 ◽  
pp. 407-411 ◽  
Author(s):  
Jacob M. Mchenya ◽  
Sheng Zhuo Zhang ◽  
Song Jing Li
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Video Camera ◽  
Computer Assisted ◽  
Servo Valve ◽  
High Speed Video ◽  
High Speed Video Camera ◽  
Hydraulic Servo ◽  
Working Principle ◽  
Computer Assisted Image

In order to understand the mechanism and get rid of the high-frequency self-excited noise in a hydraulic servo-valve, in this paper, the flow field distribution in the pilot stage of a hydraulic flapper-nozzle servo-valve is investigated. An assembly is prepared representing the construction and working principle of the flow field inside the pilot stage of a hydraulic flapper-nozzle servo-valve. A method of visualization is developed by taking videos for the flow field inside the transparent assembly with a high speed video camera. In this study, at different inlet pressure the high speed video camera was utilized for flow visualization together with computer-assisted image measurement. The shape of the jet flow, the cavitations and vortex flow inside the flow field can be visualized clearly. The proposed method enables to analyze the flow-field in the pilot stage of a hydraulic flapper-nozzle servo-valve by giving useful information for better design.

Design and Analysis of Hydraulic Full-Bridge Network for Water Hydraulic Servo Valve

2011 ◽  
Vol 181-182 ◽  
pp. 377-382
Author(s):  
Xin Hua Wang ◽  
Jian Zheng ◽  
Wei Li ◽  
Shu Wen Sun
Keyword(s):  
Slide Valve ◽  
Static Characteristic ◽  
Pressure Sensitivity ◽  
Characteristic Parameters ◽  
Load Pressure ◽  
Servo Valve ◽  
Annular Gap ◽  
Hydraulic Servo ◽  
Water Hydraulic ◽  
Pressure Characteristics

Annular gap throttle has been used in water hydraulic slide valve which makes the hydraulic full-bridge network of the water hydraulic servo valve different from that of traditional hydraulic servo valve with fixed orifice. Based on liquid resistance theory and hydraulic bridge theory, the load pressure characteristics, pressure sensitivity and static characteristic parameters have been analyzed by the research of hydraulic full-bridge network constituted by annular gap throttle and clearance throttle between flapper and nozzle. The results show that the load pressure characteristics of the hydraulic full-bridge in water hydraulic servo valve keep fine linear relationship with flapper displacement, but the pressure sensitivity decreases in the normal working range of servo valve. However, the pressure sensitivity can achieve a reasonable value by the improvement of hydraulic full-bridge.

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

2010 ◽  
Vol 145 ◽  
pp. 410-413 ◽  
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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