• Title/Summary/Keyword: 서보밸브 마멸

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In-Process Diagnosis of Servovalve Wear using Leakage Flow Measurement (누설 유량 계측에 의한 서보밸브 마멸의 인-프로세스 진단)

  • Kim K.H.;Han G.S.;Lee J.C.;Ham Y.B.;Kim S.D.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.1 no.2
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    • pp.1-7
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    • 2004
  • In-process diagnosis is essential to achieve predictive maintenance in industrial plants. An in- process diagnosis method was proposed for hydraulic servo systems, which was based upon leakage flow measurement. Leakage due to servovalve wear was analysed and modeled mathematically far computer simulation work. The key idea of diagnosis algorithm is that when monitoring signals, such as servovalve input and load displacement are in steady states, the return-line flow of hydraulic servo systems can be regarded as null-leakage of servovalve. Virtual experiments were performed to ensure effectiveness of the proposed diagnosis method.

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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 -)

  • Kim S.D.;Kim K.H.;Song J.S.;Ham Y.B.;Lee J.C.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.3 no.1
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    • pp.7-14
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    • 2006
  • 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.

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