NDLI: Preview-based inversion of nonlinear nonminimum-phase systems: VTOL example

Content Provider	IEEE Xplore Digital Library
Author	Qingze Zou Devasia, S.
Copyright Year	2004
Description	Author affiliation: Dept. of Mech. Eng., Univ. of Washington, Seattle, WA, USA (Qingze Zou)
Abstract	This article quantifies the importance of future desired output trajectory in determining system-inversion-based inputs used in precision output tracking. For minimum-phase systems, only information at the current time instant is needed to compute the current value of the exact-output-tracking input when using system inversion. In contrast, for nonminimum-phase systems, computing the bounded exact-output-tracking input at time instant t/sub c/ requires knowledge of the desired output for all future time [t/sub c/, /spl infin/]. However, it is intuitive that the effect of the desired output's distant-future values, on the output-tracking input at the current time instant, should be small. Therefore, preview information of the desired output for a finite-time window [t/sub c/, t/sub c/ + T/sub p/] should be sufficient to compute the output-tracking input (at current time (t/sub c/)) with an arbitrarily-small prescribed err-or if the preview time T/sub p/ is sufficiently large. The contribution of this article is the quantification of the required preview time T/sub p/ for nonlinear nonminimum-phase systems in terms of the desired accuracy in the computing the output-tracking input, and the characteristics of the system's internal dynamics. The proposed preview-based technique is applied to a benchmark VTOL aircraft model in simulation and results are presented.
Starting Page	4350
Ending Page	4356
File Size	371696
Page Count	7
File Format	PDF
ISBN	0780386825
ISSN	01912216
DOI	10.1109/CDC.2004.1429435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-12-14
Publisher Place	Bahamas
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Trajectory Mechanical engineering Computational modeling Electronic mail Nonlinear dynamical systems Aircraft propulsion NASA Time varying systems Flexible structures Probes
Content Type	Text
Resource Type	Article

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