ABSTRACT
P0 = pressure set up at the exit of check valve P8 = supply pressure P u = pressure before increase or decrease q = volumetric fluid flow rate through the solenoid-operated valve Q0 = discharge volumetric flow rate Q3 = supply volumetric flow rate t =time tw = pulse width U = volume of connection part VE = average fluid velocity at line section of the downstream end of pipeline V v = average fluid velocity at line section of the entrance of check valve V' v = average fluid velocity at line section of the orifice of check valve w = ratio of current open area of the solenoid-operated valve to its total open area x = coordinate in the axial direction of line Y = check valve displacement Y0 = initial compression of spring a: = valve angle between vertical and poppet face 1 = specific weight
INTRODUCTION The authors proposed to actively utilize
the pressure rise phenomenon of an oil hammer and a new type of hydraulic pressure intensifier using an oil hammer [1]. Application of the intensifier to pressure control of a hydraulic cylinder has been proposed and the fundamental characteristics have already been reported [2, 3]. In this paper, the desired input signal for pressure control is time· variable. The output pressure follows tht input signal, and the waveform which change1 the value continuously is generated. Its effi. ciency is clarified by experiment and simula· tion.
