Please use this identifier to cite or link to this item: https://doi.org/10.1002/cjce.20196
Title: Confirmation of control valve stiction in interacting systems
Authors: Haoli, Y.
Lakshminarayanan, S. 
Kariwala, V.
Keywords: Control loops
Control valves
Diagnosis
Oscillation
Static friction
Issue Date: Aug-2009
Source: Haoli, Y., Lakshminarayanan, S., Kariwala, V. (2009-08). Confirmation of control valve stiction in interacting systems. Canadian Journal of Chemical Engineering 87 (4) : 632-636. ScholarBank@NUS Repository. https://doi.org/10.1002/cjce.20196
Abstract: Stiction in a control valve generates limit cycles which can propagate to the connecting units, resulting in plant-wide oscillations and impacting the overall process performance. For stiction confirmation, Choudhury et al. [Choudhury et al., CJChE 2007;85:208-219] introduced the controller gain change method, which is based on the change in the oscillation frequency due to changes in the controller gain. In this paper, we show that this method can fail to accurately isolate and confirm the presence of the sticky valve in interacting multi-input multi-output systems. We propose a strategy based on the magnitude of relative change in oscillation frequency due to changes in controller gain to overcome the limitations of the existing method. The effectiveness of the proposed method is demonstrated using simulation studies. ©2009 Canadian Society for Chemical Engineering.
Source Title: Canadian Journal of Chemical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/63632
ISSN: 00084034
DOI: 10.1002/cjce.20196
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