Impulsive natural observers for vector second‐order Lipschitz non‐linear systems. Issue 9 (1st June 2018)

• Record Type: Journal Article
• Authors: Lu, Xiaomei; Chen, Wu‐Hua; Xue, Feifei
• Is Part Of: IET control theory & applications. Volume 12:Issue 9(2018)
• Page Start: 1349
• Page End: 1356
• Publication Date: 2018-06-01
• Subjects: differential equations -- observers -- stability -- linear systems -- nonlinear control systems -- Lyapunov methods -- vectors; velocity vectors -- impulsive observer -- second‐order framework -- observation scheme -- second‐order structure -- observed system -- system output -- observation error system -- impulsive natural observers -- vector second‐order Lipschitz nonlinear systems -- mechanical systems -- second‐order differential equations -- observation problem -- discrete measurements -- stability analysis -- impulse‐time‐dependent discretised Lyapunov function based method; Control theory -- Periodicals; Automatic control -- Periodicals; 629.8312
• DOI: 10.1049/iet-cta.2017.0926
• Languages: English
• ISSNs: 1751-8644

Abstract

Abstract : Many mechanical systems can be modelled by vector second‐order differential equations. In this study, the observation problem of a class of vector second‐order Lipschitz non‐linear systems with discrete measurements is addressed. Under the premise that the discrete measurements of position and velocity vectors are available, an impulsive observer in the second‐order framework is designed. The proposed observation scheme ensures that the second‐order structure of the observed system can be retained, and allows the sampling on the system output to be aperiodic. The stability analysis of the observation error system is performed by employing an impulse‐time‐dependent discretised Lyapunov function based method. The novelty of the introduced Lyapunov function is that its structure relies on the partition on the impulse intervals. With the increase of the partition number, the existence condition of impulsive natural observers can be relaxed. Finally, a numerical example is provided to demonstrate the effectiveness of the proposed design method.