Data-driven performance assessment of multivariable control loops using a modified Hurst exponent–based index. (July 2021)

• Record Type: Journal Article
• Authors: Khosroshahi, Maryam; Poshtan, Javad
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 235:Number 6(2021)
• Page Start: 769
• Page End: 780
• Publication Date: 2021-07
• Subjects: Performance assessment -- multivariable control systems -- Hurst exponent -- minimum variance index -- detrended fluctuation analysis -- rescaled range analysis; Mechanical engineering -- Periodicals; Automatic control -- Periodicals; Systems engineering -- Periodicals; 621.3
• DOI: 10.1177/0959651820966523
• Languages: English
• ISSNs: 0959-6518

Abstract

Control system performance assessment is significant, especially in practical applications. One of the most important indices for the performance assessment of control systems is minimum variance. Calculating the minimum variance index in multivariate systems requires prior knowledge of system parameters and models, and is therefore an obstacle in practical applications. In this article, an index is proposed for the performance assessment of multivariate control loops, evaluating the system performance with the minimum variance criterion and using only the system's routine operation data. This index can quantify the performance using neither any prior knowledge of system parameters nor the system's optimal operation data. The proposed index is based on the Hurst exponent, a parameter for measuring correlations in time series data. In this article, detrended fluctuation analysis and rescaled range analysis are used to estimate the Hurst exponents of system outputs. Using a combination of these Hurst exponents, an index is defined for the performance assessment of multivariate systems. The results of simulation examples illustrate that the proposed index can assess the performance efficiently.