Parameter identification of a hydraulic servo-valve torque motor with magnetic fluids based on dynamic characteristics

2010 ◽  
Author(s):  
Zhang Xingyuan ◽  
Li Songjing ◽  
Liu Jixiao
Keyword(s):  
Parameter Identification ◽  
Dynamic Characteristics ◽  
Magnetic Fluids ◽  
Servo Valve ◽  
Hydraulic Servo

Experimental Study of the Dynamic Properties of 2D Servo Valve with Different Pilot Structure

2014 ◽  
Vol 687-691 ◽  
pp. 326-330
Author(s):  
Wei Zhao ◽  
Jian Ruan
Keyword(s):  
Experimental Study ◽  
Dynamic Characteristics ◽  
Dynamic Properties ◽  
Structure Type ◽  
Step Response ◽  
Step Motor ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Screw Mechanism ◽  
Arch Structure

The mechanical part of the 2D servo valve is mainly a hydraulic servo screw mechanism, by which the rotary motion of the spool is turned to linear sliding. A step motor is utilized to rotate the spool and functions as the electrical-to-mechanical transformer. For studying the different influences of 2D valve's pilot circular and full arch structure on its dynamic characteristics of servo screw mechanism, a step response and sine response experiment device was designed, and the experiments were done. The experimental results show that the full arch structure type step response time is about 1.6 ms (abbreviation of millisecond), the circular type about 3ms, proved that the full bow structure can significantly improve the dynamic characteristic of servo screw mechanism, it is also be proved by sinusoidal frequency response experiments.

Depression of Self-Excited Pressure Oscillations and Noise in the Pilot Stage of a Hydraulic Jet-Pipe Servo-Valve Using Magnetic Fluids

2011 ◽  
Vol 378-379 ◽  
pp. 632-635 ◽  
Author(s):  
Song Jing Li ◽  
Jing Hui Peng ◽  
Sheng Zhuo Zhang ◽  
Jacob M. Mchenya
Keyword(s):  
Magnetic Fluid ◽  
High Frequency ◽  
Pressure Oscillation ◽  
Magnetic Fluids ◽  
Pressure Oscillations ◽  
Servo Valve ◽  
Hydraulic Servo ◽  
Working Principle ◽  
Fft Analysis

Magnetic fluid (MF) shows an increased saturation magnetization when exposed to a magnetic field. In order to improve the quality of servo-valve products by depressing and overcoming the self-excited high-frequency pressure oscillations and noise appearing in pilot stage of a hydraulic servo-valve, application of magnetic fluid in a hydraulic servo-valve is developed in this paper. Large damping can be introduced by the magnetic fluids into the servo-valve if magnetic fluids are filled into the working gaps of the hydraulic servo-valve torque motor. After the construction and working principle of a hydraulic servo-valve with magnetic fluids are introduced, the high-frequency pressure oscillation signals are tested and recorded when magnetic fluids are applied or not in the servo-valve. Experimental results are compared and analyzed by using FFT analysis method. It is shown that pressure oscillations of the servo-valve are depressed when magnetic fluids are applied.

Development and Experimental Study of Dynamic Characteristics for Servo Valve Torque Motor

2014 ◽  
Vol 621 ◽  
pp. 476-481
Author(s):  
Cheng Cheng Li ◽  
Dong Xiang Shao ◽  
Guang Lin Wang
Keyword(s):  
Dynamic Characteristics ◽  
Test System ◽  
Servo Valve ◽  
Electrical Devices ◽  
Nature Frequency ◽  
Hydraulic Servo ◽  
Overall Performance ◽  
Object Of Study ◽  
Hydraulic Devices ◽  
Key Parameter

Torque motor is the electrical - mechanical converter of servo valve, is the bridge connecting electrical devices and hydraulic devices, is one of the key elements of electro-hydraulic servo valve. The main object of study of this paper is moving iron permanent magnet torque motor. The dynamic characteristics of torque motor are the key parameter to measure the overall performance. At present, the research of most of manufacturers emphasize on the test of integral valve servo valve. Torque motor is also designed to mimic the structure and size of foreign-based valve, lacking of system understanding for characteristics of servo valve. Early in the design, people cannot effectively control the overall performance of the torque motor products. There is large performance difference with a larger group of torque motor, producing serious waste. This paper describes the principle of dynamic characteristics test, establishes a test system of dynamic characteristics for torque motor, accurately obtain nature frequency and bandwidth of torque motor on the test bench which we have established before.

Research on the dynamic characteristics improvement of the hydraulic servo valve

2003 ◽  
Vol 2003.78 (0) ◽  
pp. _6-17_-_6-18_
Author(s):  
Hiroshi KANKI ◽  
Njuki W. MUREITHI ◽  
Michihiro KAWANISHI ◽  
Fenglong PIAO
Keyword(s):  
Dynamic Characteristics ◽  
Servo Valve ◽  
Hydraulic Servo

Multidomain Modeling of Jet Pipe Electro-Hydraulic Servo Valve

2012 ◽  
Vol 233 ◽  
pp. 17-23 ◽  
Author(s):  
Yun Jiang Cheng ◽  
Shu Han Wang ◽  
Xiang Yang Xu ◽  
Wen Yong Li
Keyword(s):  
Flow Control ◽  
Dynamic Characteristics ◽  
Hydraulic System ◽  
High Performance ◽  
Simulation Tool ◽  
Two Stage ◽  
Static And Dynamic Characteristics ◽  
Servo Valve ◽  
Hydraulic Servo

The jet pipe electro-hydraulic servo valve is a typical two-stage flow control servo valve, its static and dynamic characteristics are analyzed in this paper. The interaction of the mechatronic and hydraulic system is considered by multidomain simulation tool, the all key parameters are tunable and this provides the optimal possibility to develop a high-performance jet pipe electro-hydraulic servo valve.

Characteristics Analysis of Hydraulic Servo-Valve Torque Motor Using Magnetic Fluid

2005 ◽  
Author(s):  
Songjing Li ◽  
Dan Jiang ◽  
Wen Bao
Keyword(s):  
Dynamic Performance ◽  
Magnetic Fluids ◽  
Analysis Method ◽  
Element Analysis ◽  
Servo Valve ◽  
Finite Element Analysis Method ◽  
Characteristics Analysis ◽  
Hydraulic Servo ◽  
Simulation Results ◽  
The Magnetic Field

Magnetic fluids are added to a torque motor of hydraulic servo-valve, to improve the performance of the torque motor and the servo-valve. The construction and principle of the torque motor are introduced. Using finite element analysis method, the magnetic field distribution of the torque motor is analyzed. The static and dynamic performance of the torque motor with or without magnetic fluids is studied and compared. The simulation results are shown.

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