High-speed electro-hydraulic proportional valve research

Title: High-speed electro-hydraulic proportional valve research Author: bow Degree-granting units: Southwest Jiaotong University Keywords: electro-hydraulic proportional valve;; Dynamic power - mechanical converter;; frequency;; CFD;; Unified Modeling;; parameter estimation Abstract: Electro-hydraulic proportional valve is electro-hydraulic proportional control technology, the core component, it is the traditional hydraulic control valves for industrial use, based on the use of model
Be-electrical - mechanical conversion devices, Magnetic lifter the electrical signal is converted to the displacement signal, the input electrical signal according to instructions, continuous proportional control of fluid
Pressure system flow pressure, flow or direction of the other parameters. Electro-hydraulic proportional valve and servo control system servo valve, although the
Performance in some areas there is a gap. However, the significant advantage of anti-pollution ability, reduced work due to pollution caused by
For failure to improve the hydraulic system stability and reliability, so more suitable for industrial processes. On the other hand, the cost of proportional valve
Lower than the servo valve, and does not contain sensitive and sophisticated components, easier operation and maintenance, has in many occasions to obtain a wide range of hydraulic control
Application. However, the conventional electro-hydraulic proportional valve is a proportional solenoid, as the electric drive - liquid signal components, due to their inherent characteristics
Of restrictions, leading to electro-hydraulic proportional valve response time, whether or not the response speed is very fast. Faster response, traffic has been more
Small. To this end, we propose high-speed http://www.999magnet.com/products/131-magnetic-lifter electro-hydraulic proportional valve. High-speed electro-hydraulic proportional valve hydraulic control system to achieve flow direction and flow
Volume control, electro-hydraulic proportional control system to meet the high-speed, high precision, high-volume, low cost and comprehensive anti-pollution requirements. High-speed electric
Proportional valve using moving coil electric - mechanical converter as the electrical drive - mechanical conversion element, a good control performance, some performance refers to the
Standard to meet or exceed the servo valve. First of all, for the conventional moving-coil electrical - mechanical converter of the electromagnetic force, response time and
Response speed for lack of performance, from its central part - the permanent magnet structure to start, compared to a single permanent magnet magnetized in different technologies and more
A permanent magnet array of different magnetic structures, a novel permanent magnet magnetic field along the magnetization direction of magnetic field lines, eight air gap tile
Halbach magnetic array type moving coil electrical - mechanical converter. Through the design of moving-coil electrical - mechanical converter static magnetic field parameters
Of the magnetic field, transient magnetic field, temperature field, eddy current magnetic field, power losses and the analysis of skin effect, etc., show that the moving coil electric - machine conversion
Device has a good dynamic and static performance, regardless of the electromagnetic force, or the response time and response speed than the conventional structure has greatly improved.
Then, from the ultra-high-speed electro-hydraulic proportional valve hydraulic part of the start, according to its structure and principles, combined with the power bond graph method and the CFD calculation, sub-
Analysis of the ultra high-speed direct-acting electro-hydraulic proportional pilot valve, superimposed one-way throttle valve and master the static and dynamic features, obtain high-speed electric
Hydraulic proportional valve mechanism of high-frequency and fast response. Then, for the conventional electro-hydraulic proportional valve model limitations, including a variety of non-linear according to
Characteristics of the hole flow equation for ultra-high-speed electro-hydraulic proportional valve to establish a unified model of nonlinear mathematical equations. Obtain information on the geometric properties of spool
And physical model parameters on flow through the proportional valve port relationship, to be able to cover the analysis is negative and zero cover flow proportional valve cover
Quantity equation, then flow is expressed as a parameter on the valve cover and other conventional parameters of a continuous nonlinear function. Meanwhile, the ultra-high-speed electric
Proportional valve unified model of non-dimensional analysis shows that the model's accuracy independent of the model parameters, a unified model of the error is only dependent on the
Hydraulic damping. To ensure high-speed electro-hydraulic proportional valve, reliable performance, the importance of monitoring critical parameters proportional valve, to determine the fault
Is displayed. However, the proportional valve operation, direct measurement of some parameters will be very difficult. In this paper, three parameters estimated
Design methods, the general least squares, maximum likelihood estimation and fuzzy RBF network method to estimate the proportion of high-speed direct-acting electro-hydraulic pilot
Valve spring stiffness. Estimates and actual results or less, indicating that these three methods is feasible. Finally, through the ultra-
High-speed electro-hydraulic proportional pilot valve direct-acting experimental study, we can see the results of experimental and simulation results are basically consistent, indicating that the design of electro-hydraulic proportional
Valve with a high frequency and fast response characteristics, can meet the high-speed electro-hydraulic proportional control technology requirements. Degree Year: 2009