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김성동(S. D. Kim),전세형(S. H. Jeon),주별진(B. J. Joo),윤소남(S. N. Yoon) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.6
Common type of servovalves is to control flowrate measuring and diagnosis of servovalve`s hysteresis is based upon analysis of flowrate signal. The ISO 10770-1 and KS B 6511 regulations for servovalve`s hysteresis are also established from analysis of flowrate signal. The measurement of flow is hard to implement. In this study, some hysteresis diagnosis methods are investigated to use pressure signal and spool displacement signal. Three kinds of hysteresis; flowrate hysteresis, pressure hysteresis and spool displacement hysteresis are measured from an experiment set-up. Two kinds of pressure hysteresis; pressure gain hysteresis and no-load pressure hysteresis are investigated. The spool displacement hysteresis is found to be the most accurate and pressure hysteresis are also good enough as well as flow hysteresis. The pressure gain hysteresis shows a little error from other hysteresis, and it is estimated because geometric dimension error of spool and sleeve affects the hysteresis.
스풀-슬리브 형상공차가 서보밸브 정특성에 미치는 영향 연구
김성동(S.D. Kim),손성회(S.H. Son),주별진(B.J. Joo),윤주섭(J.S. Yun) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.4
In their paper, it was studied how the clearance, overlap and mismatch error of spool sleeve affect static pressure characteristics of a servo valve. A computer simulation model was established for a direct acting servo valve, A series of simulation were done for various values of clearance, overlap and mismatch error. Pressure gain decreased as the clearance increased. The overlap also affects the pressure gain and it was similar to the effect of clearance. Asymmetry of pressure plot got worse and worse as the mismatch error increased.