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A Novel Approach for Detection of Valve Stiction by Time Delay Estimation

Journal Name:

  • Journal of Control Engineering and Technology

Publication Year:

  • 2013

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Abstract (Original Language): 
The Process variable oscillations in a control loop occur due to poor controller tuning, control valve stiction and oscillatory disturbance. Their effects propagate to control loop and may impact the overall process performance. The high static friction i.e. stiction occurring in a control valve can severely affect the control loop performance. The stiction detection is an important process in a control loop performance monitoring. The objective of this work is detection of oscillations in a control loop, which will identify the result of control valve stiction. The proposed stiction detection method is based on the time delay estimation between manipulated variable and controller output. The selected method has been implemented in the first order plus dead time (FOPDT) process using Matlab.
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