Title :
Influence of temperature on null position pressure characteristics of flapper-nozzle servo valve
Author :
Xi, Zhang ; Yaobao, Yin ; Weida, Huang
Author_Institution :
Coll. of Mech. Eng., Tongji Univ., Shanghai, China
Abstract :
At different working temperature, Flow coefficients of the orifices in the pilot state of flapper-nozzle servo valve will change due to the changes of hydraulic oil properties. It may change the pressure distribution in the valve, which affect the dynamic performance of servo valve directly. Based on test data, piecewise functions were set up to describe the relation between flow coefficient and flow number for the orifices. Then combined with the calculations of hydraulic oil parameters, the variation of null position control pressure of flapper-nozzle servo valve was simulated while working temperature changed from -40°C to 135°C. According to the simulation results, when working temperature is lower than 80°C, the control pressure of servo valve will change along with temperature, but a proper drain orifice may reduce the pressure variation.
Keywords :
electrohydraulic control equipment; nozzles; orifices (mechanical); pressure control; servomechanisms; valves; drain orifice; flapper nozzle servo valve; flow coefficients; hydraulic oil properties; null position control pressure; null position pressure characteristics; temperature influence; Force control; Orifices; Petroleum; Pressure control; Proportional control; Servomechanisms; Springs; Temperature control; Torque; Valves; control pressure; flapper-nozzle servo valve; flow coefficient; numerical simulation; temperature;
Conference_Titel :
Computer Design and Applications (ICCDA), 2010 International Conference on
Conference_Location :
Qinhuangdao
Print_ISBN :
978-1-4244-7164-5
Electronic_ISBN :
978-1-4244-7164-5
DOI :
10.1109/ICCDA.2010.5540780
