High Speed On-off Valve Research Articles

Linear Control Performance Improvement of High Speed On-Off Valve Controlled by PWM

Linear Control Performance Improvement of High Speed On-Off Valve Controlled by PWM

Aircraft Anti-Skid Brake Control Based on High-Speed on-off Valve

Aircraft hydraulic brake system usually use pressure servo valve for anti-skid brake control. As pressure servo valve realizes the pressure closed loop by hydraulic feedback loop, this structure increased the complexity of the processing and manufacturing, restricted the pressure closed loop parameters adjustment, and increased the difficulty of debugging the system design. Pressure servo valve is expensive and difficult to process, poor ability to resist pollution. This paper proposed a slip ratio large closed loop aircraft anti-skid brake control method based on high-speed on-off valve, built the model of aircraft ground vertical taxiing and slip ratio large closed loop control algorithm in the MATLAB/SIMULINK, and built the model of aircraft hydraulic brake system based on on-off valve in the AMESim and a joint simulation was carried out. The simulation results show that the aircraft anti-skid brake control method based on high-speed on-off valve is feasible, and the on-off valve is cheap with strong ability to resist pollution, easy processing and manufacturing and so on, showing a good application prospect.

Experimental Research of Hydraulic Cylinder Speed Control System Based on High-Speed On-Off Valve

Series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed to control the speed of hydraulic cylinder based on the analysis of high-speed on-off valve flow characteristics. The duty cycle of pulse control signal was changed according to the displacement of hydraulic cylinder to control the speed of hydraulic cylinder and weak the impact. The speed and acceleration curve of hydraulic cylinder were achieved by the means of experiment with FESTO. Experimental results show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

The Research of Hydraulic Cylinder Controlled by Digital Valve

This paper aims to research the position control of the hydraulic cylinder controlled by the high-speed on-off valve to realize the precise position control. A compound algorithm of proportional integral & speed feedforward- displacement feedback is put forward based on the research on the relationship between the duty ratio and the past flow for the high speed on-off valve. The speed feedforward-displacement feedback algorithm can solve the hysteresis resulting from the feedback control and be considered as the certain duty ratio is given ahead, and the proportional integral control algorithm is designed and utilized to deal with the position error by adjusting to the duty ratio of high speed on-off valve. The genetic algorithm is used to tune the control parameters, including speed forward coefficient, proportional and integral coefficient of displacement feedback, output coefficient to gain the optimization result, on terms of the performance of the position control system. The mathematics modeling is analyzed and simulated with Simulink using the bulk-cavity-node method, and the hydraulic loop is established to verify the simulation result with the optimized results on the FESTO platform. the research finds that the proposed position scheme is effective to increase the position precision, and the position control parameters optimized by genetic algorithm can decrease the position error more. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.4218

High Speed On-Off Valve Self-adapting Clamping System

High Speed On-Off Valve Self-adapting Clamping System

Collaborative Synchronization Digital Control for Double Hydraulic Cylinders

By researching the synchronization motion of double hydraulic cylinders controlled by high-speed on-off valve, the paper aims to solve the shortage of current hydraulic synchronization system with low synchronization precision. The flow characteristic of high-speed on-off valve with pulse width-frequency modulation is researched compared with pulse width modulation. The mathematical equations of the double hydraulic cylinders are formulated with bulk-cavity-node method in MATLAB/Simulink. The collaborative synchronization control is analyzed and the compound algorithm of collaborative synchronization control and pulse width-frequency modulation is simulated compared with collaborative synchronization control. The hydraulic loop is set up to verify the simulation result with the proposed control algorithm on the FESTO platform. The research finds that (1) the pulse width-frequency modulation control can be linear to the flow of high-speed on-off valve on the duty bound of 0~100%; (2) the collaborative synchronization control is effective to eliminate the displacement error between the double cylinders which results from the different load environment and other disturbance.

The position control of hydraulic cylinder based on high-speed on-off valve

This paper aims to research the position control of the hydraulic cylinder controlled by the high-speed on-off valve to realise the precise position control. The flow characteristic of the research on the relationship between the duty ratio and the average flow is researched. The mathematical model of the hydraulic cylinder is analysed and simulated with MATLAB/Simulink using the bulk-cavity-node method, and the compound algorithm of PD and speed feedforward-displacement feedback with the pulse width modulation (PWM) control is put forwarded. The position control of different control parameters is researched and the genetic algorithm is used to tune the control parameters. The hydraulic loop is set up to verify the simulation result with the optimised control parameters on the FESTO platform. The design methodology and control algorithm can be applied to other hydraulic system with position control requirement.

The Optimal Design and Simulation Analysis of High-Speed Switching Valve Based on Magnetorheological Fluid

This article designed a kind of magnetorheological high-speed on-off valves and made optimized design based on the nature of the magnetorheological fluid(MRF). ANSYS software was used to analyze magnetic field of the two different structures and get the magnetic flux lines distribution and flux density map. The simulation analysis results show that: optimized high speed switching valve, can reduce the loss of the coil and the rise of temperature, improves the life of the valve body, it also can shorten the switching response time and improves the reliability of the valve.

Coupling Simulation and Characteristic Analysis of Pure Water High-Speed On-Off Valve

The paper introduces the structure and operating principle of two-position three-way pure water high-speed solenoid on-off valve, establishes the mathematical model of on-off valve, obtains performance parameters of electromagnet through Ansoft simulation, imports the performance parameters of electromagnet into the solenoid on-off valve simulation model in AMESim, and realizes the coupling simulation among electromagnetic circuit, mechanical part and hydraulic system, so as to improve simulation precision and achieve relatively correct static-dynamic simulation results of high-speed solenoid on-off valve.

A Hydraulic Pressure-Boost System Based on High-Speed On–Off Valves

A novel hydraulic pressure-boost system utilizing high-speed On-Off valves is studied in this paper. The hydraulic pressure-boost system is analogous to a boost converter in power electronics. High pressure is achieved by braking a hydraulic motor with inertia flywheel through the high-speed On-Off valve. The high pressure is stabilized by a hydraulic capacitor set at the motor output. The steady state and fluctuation characteristics of the pressure-boost system are studied. Research shows that the output pressure is always higher than system pressure and it increases with the duty ratio of pulse width modulation (PWM) signal supplied to the high-speed On-Off valve. It also shows the output pressure fluctuation is greatly influenced by the PWM signal frequency and the oil chamber volume. The hydraulic pressure-boost system was built and tested. It successfully boosted the system pressure from 50 to 116 bar at the PWM signal duty ratio of 0.7. The success of the experiment brings a new way to boost hydraulic pressure.

Research for Sliminess Ratio Control System Based on High Speed On-Off Valve

Airport runway friction coefficient test vehicle is the key equipment to test the runway friction coefficient, it's test precision directly affects the safety of aircraft. The international civil aviation organization prescribed slip ratio is 12%.How to maintain this value is a key part. This thesis aims to do research for this slip ratio control system. High speed on-off valve is its core part. The traditional friction coefficient testing vehicle adopt servo valve. But servo valve is high demanding on its operating environment and its expensive. Using high speed on-off valve is good to avoid these disadvantages. The simulation results show that the method is reliable and effective.

Design of Direct-Control Hydraulic Cylinder Speed Control System Base on High-Speed On-Off Valve

Application of high-speed on-off valve in the hydraulic speed control system was researched in this paper. The direct-control circuit application of high speed on-off valve is proposed to control the speed of hydraulic cylinder. The duty cycle of pulse control signal was changed according to the displacement of hydraulic cylinder to control the speed and weak the impact. The speed and accelerated speed curves of hydraulic cylinder were achieved by the means of simulation with Simulink and experiment with FESTO is obtained, and research result shows that the applied scheme can effectively control the speed of hydraulic cylinder effectively.

Design of Bypass-Throttle Hydraulic Cylinder Speed Control System Base on High-Speed On-Off Valve

Application of high-speed on-off valve in the hydraulic speed control system was researched in this paper. The bypass-throttle circuit application of high speed on-off valve is proposed to control the speed of hydraulic cylinder. The duty cycle of pulse control signal was changed according to the displacement of hydraulic cylinder to control the speed and weak the impact. The speed and accelerated speed curves of hydraulic cylinder were achieved by the means of simulation with Simulink and experiment with FESTO is obtained, and research result shows that the applied scheme can effectively control the speed of hydraulic cylinder effectively.

Design and Performance Analysis Based on High-Speed Switching Valve of Magnetorheological Plug-Mounted

Based on the rheological mechanism of magnetorheological fluid，we can design a kind of magnetorheological high-speed on-off valves,which used the Plug-in structure.It is shows that， through the static and dynamic performance analysis of the valves，the magnetorheological high-speed on-off valves not only has the good static, dynamic characteristics, compare to magnetorheological plug-mounted speed switch valve with traditional hydraulic, and with high speed of response, high stability, etc . It is an easy to achieve automatic control and intelligent control of the hydraulic components.

Modeling and Simulation Research of Hydraulic Cylinder Speed Control System Based on High-Speed On-Off Valve

Application of high-speed on-off valve in the hydraulic cylinder speed control system was researched in this paper. Series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed. Model of high-speed on-off valve and hydraulic circuit were established to carry out simulation. The speed and acceleration curve of hydraulic cylinder were achieved by the means of simulation with Simulink. The simulation curves show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

Design of Hydraulic Cylinder Speed Control System Base on High-Speed on-Off Valve

In order to study the Application of high-speed on-off valve in the hydraulic cylinder speed control system, series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed to control the speed of hydraulic cylinder. The duty cycle of pulse control signal was changed according to the displacement of hydraulic cylinder to control the speed of hydraulic cylinder and weak the impact. The simulation curve compared with the experimental results show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

Analysis on the Application of High Speed on-Off Valve(HSV) as Pilot Valve

High Speed on-off Valve (HSV), when used as the pilot valve of the proportional directional valves, can improve its dynamic characteristics，reduce dead area，improve digitization and reduce the cost. Also, we can gain core competitiveness by mastering key technology in this field. This paper did simulations with Matlab and AMESim software, studied the characteristics of High Speed on-off Valve (HSV) as the pilot valve, and finally proposed key problems that need to be solved in the next stage of the research.

Hydraulic High Speed On-Off Valve and its Application on Industry

High-speed on-off valve has been introduced in this paper with its concept and applications in various industries. Its trend and development in the future is optimized. This technology does challenge the proportional and servo technology in hydraulic area, because the technology can be used in displacement control of hydraulic pump, proportional and servo system, valve bank shifting, digital cylinder and so on.

Extending of the Duty Ratio Range of Pulse Width Modulation Control on High Speed on-off Valve

High speed on-off valve controlled by pulse width modulation(PWM) of high frequency can get the valve floated at a certain orifice which is adjusted by changing the duty ratio.In consequence,the flow and pressure can be controlled proportionally by the valve so as to it is used widely in vehicle control system.But the duty ratio range of PWM control on high speed on-off valve designed by our country is narrow,and the valve is easy to open and close completely.In order to improve the controllability and control precision of the valve,it is necessary to study how to extend the duty ratio range.Based on the high speed on-off valve for the automotive electronic stability program(ESP),the flow force of the valve is in-depth analyzed in this paper.Besides,the co-simulation model of hydraulic control unit is established by AMESim and Matlab,which is also verified by test.Consequently,it is shown that the effect of the poppet angle of valve body and diameter of inlet on the displacement of valve.The crucial parameter on the extending of the duty ratio range is acquired.The result can provide references for the design and development of the high speed on-off valve.

Design, Modeling and Simulation of an Innovation Pneumatic High Speed on-Off Valve Based on Giant Magnetostrictive Material

Based on giant magnetostrictive material, a new design of pneumatic high speed on-off valve is presented in this paper. To settle the problem of balancing fast response and large flow, a cantilever beam is employed as both displacement amplifier and valve spool in the innovation structure of the valve. The dynamic model of the valve is established by analyzing the dynamic performances of the giant magnetostrictive actuator and the cantilever beam, based on the theories of electromagnetism and the mechanical vibration. A simulation on this model is carried out to investigate the performance of the valve. Results of the simulation show that the new pneumatic high speed on-off valve is able to achieve the goal of high frequency response, while satisfying the requirement of a large flow.