DocumentCode
697227
Title
Detection of valve stiction in integrating processes
Author
Horch, Alexander ; Isaksson, Alf J.
Author_Institution
ABB Corp. Res., Ladenburg, Germany
fYear
2001
fDate
4-7 Sept. 2001
Firstpage
1327
Lastpage
1332
Abstract
A simple method for detection of static friction (stiction) in control valves was presented in [6]. However, that method cannot be used for control loops with integrating processes. This paper presents a new method to handle these cases. The main idea is to detect abrupt changes (which are typical in the case of stiction) in the loop output. This is done by considering the probability distribution of the second derivative. In the stiction case the distribution is close to Gaussian, otherwise it will have two peaks.
Keywords
signal detection; statistical distributions; stiction; valves; control loops; control valves; probability distribution; static friction detection; valve stiction detection; Correlation; Gaussian distribution; Histograms; Level control; Oscillators; Process control; White noise; Process supervision; process control; signal processing; statistical fault diagnosis;
fLanguage
English
Publisher
ieee
Conference_Titel
Control Conference (ECC), 2001 European
Conference_Location
Porto
Print_ISBN
978-3-9524173-6-2
Type
conf
Filename
7076101
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