Improving Root Cause Analysis by Detecting and Removing Transient Changes in Oscillatory Time Series with Application to a 1,3-Butadiene Process
- Baifan ZhouBaifan ZhouKarlsruhe Institute of Technology, Kaiserstraße 12, Karlsruhe 76131, GermanyMore by Baifan Zhou
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- Moncef Chioua*Moncef Chioua*Email: [email protected] (M.C.).ABB Corporate Research, Wallstadter Straße 59, Ladenburg 68526, GermanyMore by Moncef Chioua
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- Margret BauerMargret BauerDepartment of Electrical, Electronic and Computer Engineering, University of Pretoria, Lynwood Road, Pretoria 0003, South AfricaMore by Margret Bauer
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- Jan Christoph SchlakeJan Christoph SchlakeABB Corporate Research, Wallstadter Straße 59, Ladenburg 68526, GermanyMore by Jan Christoph Schlake
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- Nina F. ThornhillNina F. ThornhillCentre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United KingdomMore by Nina F. Thornhill
Abstract

Oscillations occurring in industrial process plants often reflect the presence of severe disturbances affecting process operations. Accurate detection and root-cause analysis of oscillations is of great interest for the economic viability of the process operation. Standard oscillation detection and root cause analysis methods require a large enough number of data samples. Unrelated transient changes superimposed on the oscillation pattern reduce the number of useful data samples. The present paper proposes simple heuristic methods to effectively detect and remove two types of transient changes from oscillatory signals, namely step changes and spikes. The proposed methods are used to preprocess oscillatory time series. The accuracy gained when using autocorrelation function method for oscillation detection (Thornhill, N. F.; Huang, B.; Zhang, H. J. Process Control2003, 13, 91–100) and transfer entropy method for oscillation propagation (Bauer, M.; Cox, J. W.; Caveness, M. H.; Downs, J. J.; Thornhill, N. F. IEEE Trans. Control Syst. Technol.2007, 15, 12–21) is experimentally evaluated. The methods are carried out on a 1,3-butadiene production process where several measurements showed an established oscillation occurring after a production level change.
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