To solve the problem of large overshoot and long adjustment time of dynamic pressure response of a new type Ball-type Rotary Direct Dive Pressure Servo Valve (BRDDPSV), a mathematical model is developed based on the classical control theory. The main structure parameters and electronic control method that affect the stability of BRDDPSV are analyzed. Theoretical analysis shows that the response stability of the BRDDPSV can be improved by properly adjusting the structural parameters, including reducing the spool diameter, and decreasing the negative cover of the valve port or changing the small ball and cylindrical hole into a slight interference fit. With respect to the control method, on the basis of the original PI control, large overshoot of dynamic response can be inhibited through integral separation, and the adjustment time of the dynamic response can be shortened through dynamic pressure feedback correction. Finally, semi-physical simulation experiments show that with proper structural parameters and electrical control methods, the pressure overshoot can be controlled to be less than 0.5 MPa (system pressure was 21 MPa), and the response adjustment time can be controlled within 30 ms theoretically and experimentally. It can meet the requirements of aircraft brake pressure servo valve.
LU Liang
,
XIA Feiyan
,
YIN Yaobao
,
YUAN Jiayang
,
FANG Xiang
. Dynamic analysis and optimization of ball-type rotary direct drive pressure servo valve[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018
, 39(10)
: 422143
-422143
.
DOI: 10.7527/S1000-6893.2018.22143
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