Generalized sampled-data holds to reduce energy consumption in resonant systems

This paper presents an exhaustive experimental study on the performance of a new design of generalized sampled-data hold function (GSHF) introduced in Ugalde, Bárcena, and Basterretxea (2012). First a simple tuning procedure is developed for the GSHF to improve the intersample response while not dam...

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Bibliographic Details
Published in:Control engineering practice 2014-05, Vol.26, p.28-40
Main Authors: Ugalde, Unai, Bárcena, Rafael, Basterretxea, Koldo
Format: Article
Language:English
Subjects:
Algorithms
Control
Data hold
Design engineering
Dry friction
Hardware
Mathematical analysis
Positioning systems
Sampled-data systems
Sampling
Signal reconstruction
Transient oscillations
Tuning
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Summary:This paper presents an exhaustive experimental study on the performance of a new design of generalized sampled-data hold function (GSHF) introduced in Ugalde, Bárcena, and Basterretxea (2012). First a simple tuning procedure is developed for the GSHF to improve the intersample response while not damaging the plant output response. Next the reconstruction algorithm is enhanced so that the GSHF can remove the steady-state errors that dry friction causes in positioning systems. The experiments conducted on a small-scale lightly damped resonant system show that significant energy savings can be achieved in regulation with no extra hardware, and that no additional computational load results, except having to call the D/A converter more than once per sampling period. •Several experiments are conducted to test a new design of hold device in real time.•The new hold is used instead of a ZOH to drive a lightly damped resonant system.•Transient energy savings around 40–50% are then achieved.•The new hold eases the elimination of steady-state errors arising from dry friction.•The hold functionality is computed and produced in controller idle time.
ISSN:0967-0661
1873-6939
DOI:10.1016/j.conengprac.2014.01.006