A Study on In-Process Performance Diagnosis of Hydraulic Servovalves - First Report : Position Control System -

유압서보밸브의 인-프로세스 성능 진단에 관한 연구 I - 유압실린더 위치제어계의 경우 -

In this paper, an in-process diagnosis method for performance of position control servo system was studied, which was based upon null bias, slew-rate ratio and delay time measurement. Slew-rate ratio and delay time were analyzed by theoretical analysis, computer simulation and experiment. As a result of these analysis, when spool of servovalve was weared, slew-rate ratio was decreased and delay time was increased.