Online shaft encoder geometry compensation for arbitrary shaft speed profiles using Bayesian regression

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dc.contributor.author Diamond, D.H. (David)
dc.contributor.author Heyns, P.S. (Philippus Stephanus)
dc.contributor.author Oberholster, Abraham Johannes (Abrie)
dc.date.accessioned 2016-08-17T09:19:07Z
dc.date.issued 2016-12
dc.description.abstract The measurement of instantaneous angular speed is being increasingly investigated for its use in a wide range of condition monitoring and prognostic applications. Central to many measurement techniques are incremental shaft encoders recording the arrival times of shaft angular increments. The conventional approach to processing these signals assumes that the angular increments are equidistant. This assumption is generally incorrect when working with toothed wheels and especially zebra tape encoders and has been shown to introduce errors in the estimated shaft speed. There are some proposed methods in literature that aim to compensate for this geometric irregularity. Some of the methods require the shaft speed to be perfectly constant for calibration, something rarely achieved in practice. Other methods assume the shaft speed to be nearly constant with minor deviations. Therefore existing methods cannot calibrate the entire shaft encoder geometry for arbitrary shaft speeds. The present article presents a method to calculate the shaft encoder geometry for arbitrary shaft speed profiles. The method uses Bayesian linear regression to calculate the encoder increment distances. The method is derived and then tested against simulated and laboratory experiments. The results indicate that the proposed method is capable of accurately determining the shaft encoder geometry for any shaft speed profile. en_ZA
dc.description.department Mechanical and Aeronautical Engineering en_ZA
dc.description.embargo 2017-12-31
dc.description.librarian hb2016 en_ZA
dc.description.sponsorship Skye Foundation postgraduate scholarship and the Eskom Power Plant Engineering Institute (EPPEI). en_ZA
dc.description.uri http://www.elsevier.com/locate/jnlabr/ymssp en_ZA
dc.identifier.citation Diamond, DH, Heyns, PS & Oberholster, AJ 2016, 'Online shaft encoder geometry compensation for arbitrary shaft speed profiles using Bayesian regression', Mechanical Systems and Signal Processing, vol. 81, pp. 402-418. en_ZA
dc.identifier.issn 0888-3270 (print)
dc.identifier.issn 1096-1216 (online)
dc.identifier.other 10.1016/j.ymssp.2016.02.060
dc.identifier.uri http://hdl.handle.net/2263/56372
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2016 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Mechanical Systems and Signal Processing. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Mechanical Systems and Signal Processing, vol. 81, pp. 402-418, 2016. doi : 10.1016/j.ymssp.2016.02.060. en_ZA
dc.subject Instantaneous angular speed en_ZA
dc.subject Shaft encoder en_ZA
dc.subject Zebra tape en_ZA
dc.subject Geometry compensation en_ZA
dc.subject Bayesian regression en_ZA
dc.title Online shaft encoder geometry compensation for arbitrary shaft speed profiles using Bayesian regression en_ZA
dc.type Postprint Article en_ZA


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