|
Li Sheng
Ruan Jian
Department of Mechanical Engineering, Zhejiang University of
Technology, Hangzhou 310014, China
Burton R
krainetz P
Department of Mechanical Engineering, University of
Saskatchewan,
57 Campus Drive Saskatoon,
Saskatchewan, Canada, S7N 5A9 |
|
|
2D SIMPLIFIED SERVO VALVE*
Abstract: A novel pilot stage valve called simplified 2D valve, which utilizes both rotary and linear motions of a single spool, is presented. The rotary motion of the spool incorporating hydraulic resistance
bridge, formed by a damper groove and a crescent overlap
opening, is utilized as pilot to actuate linear motion of the
spool. A criterion for stability is derived from the linear
analysis of the valve. Special experiments are designed to
acquire the mechanical stiffness, the pilot leakage and the step
response. It is shown that the sectional size of the spiral
groove affects the dynamic response and the stiffness
contradictorily and is also very sensitive to the pilot leakage.
There-fore, it is necessary to establish a balance between the static and dynamic characteristics in deciding the structural parameters. Nevertheless, it is possible to sustain the dynamic response at a fairly high level, while keeping the leakage of the pilot stage at an accept-able level.
Key words:
Servo valve Piloted control Dynamic
characteristics |