Pole-placement Predictive Functional Control for under-damped systems with real numbers algebra. (November 2017)

• Record Type: Journal Article
• Authors: Zabet, K.; Rossiter, J.A.; Haber, R.; Abdullah, M.
• Is Part Of: ISA transactions. Volume 71:Part 2(2017)
• Page Start: 403
• Page End: 414
• Publication Date: 2017-11
• Subjects: Predictive Functional Control -- Pole-placement -- Under-damped system -- Real number algebra; Engineering instruments -- Periodicals; Engineering instruments; Periodicals; Electronic journals; 629.805
• DOI: 10.1016/j.isatra.2017.08.002
• Languages: English
• ISSNs: 0019-0578

Abstract

Abstract: This paper presents the new algorithm of PP-PFC (Pole-placement Predictive Functional Control) for stable, linear under-damped higher-order processes. It is shown that while conventional PFC aims to get first-order exponential behavior, this is not always straightforward with significant under-damped modes and hence a pole-placement PFC algorithm is proposed which can be tuned more precisely to achieve the desired dynamics, but exploits complex number algebra and linear combinations in order to deliver guarantees of stability and performance. Nevertheless, practical implementation is easier by avoiding complex number algebra and hence a modified formulation of the PP-PFC algorithm is also presented which utilises just real numbers while retaining the key attributes of simple algebra, coding and tuning. The potential advantages are demonstrated with numerical examples and real-time control of a laboratory plant. Abstract : Highlights: Pole-placement Predictive Functional Control is introduced for under-damped plants. The tuning of PP-PFC is more straightforward than with a conventional PFC. PP-PFC allows the selection of target closed-loop poles. The paper demonstrates how to avoid the use of complex algebra. The PP-PFC algorithm is demonstrated on a servo rig with a flexible joint.