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Static H-infinity loop shaping control of a fly-by-wire helicopter

By E. Prempain and Ian Postlethwaite

Abstract

This paper was published as Automatica, 2005, 41 (9), pp.1517-1528. It is available from http://www.sciencedirect.com/science/journal/00051098. Doi: 10.1016/j.automatica.2005.04.001Metadata only entryThis paper introduces a novel static output feedback version of the design procedure of [McFarlane & Glover, 1992. IEEE Trans. Aut. Control 37(6), 759–769]. Existence conditions for a static output loop shaping controller are given in terms of two coupled matrix inequalities. Simple linear sufficient conditions can be derived from these coupled nonlinear inequalities and the determination of a static, sub-optimal, H∞loop shaping controller reduces to an optimization problem over Linear Matrix Inequalities. The new procedure is demonstrated by its application to the design of a flight control system for the Canadian NRC fly-by-wire Bell 205 research helicopter. The resulting H∞ controller has just three states and would appear to be the simplest flight control system used on this helicopter. The system was successfully flight-tested and high levels of performance were achieved

Year: 2005
DOI identifier: 10.1016/j.automatica.2005.04.001
OAI identifier: oai:lra.le.ac.uk:2381/1975
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