Development of a High-Pressure Pneumatic On/Off Valve with High Transient Performances Direct-Driven by Voice Coil Motor

Abstract

The high-speed pneumatic on/off valve is one of the critical components in pneumatic systems, which has been widely investigated in the last decades. In this research, a new voice coil motor direct drive high-speed pneumatic on/off valve (VCM-DHPV) is proposed, and the mathematical model of VCM-DHPV, which consists of the fluid subsystem and electro-mechanical subsystem, is established. In addition, the key structural parameters of VCM-DHPV are optimized through the simulation analysis to improve its dynamic performance. The experiment results show that the developed VCM-DHPV has a good sealing performance by adopting the face-seal type in the valve port, and a large flow rate up to 5500 L/min, and its opening response time is 8.2 ms under the gas supply pressure of 8 MPa and exiting voltage of 240 V. With the supply pressure and the exciting voltage rising, the opening response time of VCM-DHPV is gradually increasing, and the variation tendency of the spool displacement curves is in accordance with the simulation results. This research will have significantly effects on raising the performance of the high-speed pneumatic on/off valve and the development of pneumatic precision motion control.

Evolutionary Algorithm-Based Friction Feedforward Compensation for a Pneumatic Rotary Actuator Servo System

“…(4) The flow state of the gas flowing through the orifice is an isentropic adiabatic process. (5) The change of each parameter in the dynamic process is only a small amount (small disturbance hypothesis).…”

“…Pneumatic technology has the advantages of fire prevention, energy saving, high efficiency and no pollution [1][2][3][4]. It has become an important means to realize the automation of production process with the complement of hydraulic, mechanical, electrical and electronic technology [5][6][7][8]. Also, pneumatic servo systems have been widely used in the proportional control and program control systems in some multipipe production processes of automobile production lines, as well as the metallurgy and chemical industries [9].…”

Analysis of flow characteristics and throttling loss of a novel high-frequency two-dimensional rotary valve

“…For example, a cone valve and a cartridge type high-speed on-off valve were proposed by Winkler and Scheidl, 9 which can be switched within 1 ms; in order to reduce the movement quality to improve the dynamic characteristics of the valve spool, a hollow valve spool structure was designed by Wu et al, 10 and some new miniature on-off valves have also been proposed. In terms of high-performance electromechanical converter, Nie et al 11 designed a new voice coil motor direct drive high-speed pneumatic onoff valve, and got 8.2 ms opening response time under the gas supply pressure of 8 MPa and exiting voltage of 240 V. In the aspect of advanced control algorithm, a set of control circuit with three voltage switching excitation was proposed by Lee, 12 which uses different voltage excitation at different stages of high-speed on-off valve action; similar control principle, multivoltage adaptive drive control algorithm was proposed by Zhang et al 13 According to the working mode of the valve spool, the high-speed on-off valve can be divided into slide valve type and rotary valve type. The slide valve type high-speed on-off valve has the advantage of the large flow, but the greater hydraulic force on the valve spool will produce greater inertia, which makes it difficult for the valve spool with slide valve structure to realize rapid reciprocating motion.…”

Design and performance research on the actuator of high-speed valve based on shear working mode of magnetorheological fluid

“…Applying the small flow high speed on/off valve to piloting pressures may achieve a main stage valve with fast response and large nominal flow, but this performance can be significantly affected by the system load pressures [3]. In order to find a better design solution to the design tradeoff between the fast response and large nominal flow, smart materials such as piezoelectric material, giant magneto strictive material, memory alloy and magnetorheological (MR) fluid, have been frequently applied to the development of high-speed valve [4][5][6][7]. The deformation of piezoelectric material and giant magneto strictive materials occurs under the electric or magnetic fields with quick response.…”