NDLI: Analysis of multi-loop multi-rate digital control systems

Content Provider	IEEE Xplore Digital Library
Author	Konar, A.F. Lee, J.F.
Copyright Year	1976
Description	Author affiliation: Honeywell Inc., St. Petersburg, Florida (Lee, J.F.) \|\| Honeywell Inc., Minneapolis, Minnesota (Konar, A.F.)
Abstract	A multi-rate multi-loop digital control system is a special class of a time varying system which contains two or more sampling switches operating at different data rates and two or more signal flow loops. When the ratio of the different rates are integers (i. e,, in practice most often powers of two) it is possible to analyze a multi-rate multi-loop system by reducing it to an equivalent signal rate multiloop time invariant system. Three different modeling procedures for this class of systems are: (i) sampler decomposition in time domain, (ii) sampler decomposition in frequency domain, and (iii) hybrid state transition. In the first and the third methods, the multi-rate system is reduced to an equivalent single rate system with the largest sampling period, whereas in the second method, the multi-rate system is reduced to an equivalent single rate system with the smallest sampling period. In this paper, a methodology is developed to apply the frequency domain decomposition technique to large scale digital systems. Three assertions are given which provide methods to compute multi-rate system with state space techniques. The developed algorithm which has been incorporated in the DIGIKON-II program is applied to the Space Shuttle flight control system. The multi-rate results are developed for 2:1 and 4:1 sampling ratios.
Starting Page	446
Ending Page	446
File Size	47662
Page Count	1
File Format	PDF
DOI	10.1109/CDC.1976.267774
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1976-12-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Digital control Sampling methods Frequency domain analysis Time varying systems Switches Signal analysis Time invariant systems Power system modeling Large-scale systems Digital systems
Content Type	Text
Resource Type	Article

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