Active vibration control of a sphere using rotary oscillations

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Abstract

Investigating the vortex-induced vibrations (VIV) of a sphere offers us not only the opportunity to better understand fundamentals of fluid-structure interaction, but also to develop practical control approaches of VIV. In this study, we impose high-frequency rotary oscillations on a sphere as a control method to disrupt large-scale vortex formation in the wake. The effects of rotary oscillation frequency and amplitude were first investigated to gain an understanding of vortex suppression mechanisms and to define the bounds of open-loop control effectiveness. It was found that the effects of high-frequency rotary oscillations varied across the range of vibration modes investigated. For the mode II branch, optimal tuning of the oscillation frequency resulted in an 84% reduction in VIV amplitude. Subsequently, an attempt was made to further suppress VIV by implementing a closed-loop control system.

Original languageEnglish
Title of host publicationProceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018
EditorsTimothy C.W. Lau, Richard M. Kelso
PublisherAustralasian Fluid Mechanics Society
Number of pages4
ISBN (Electronic)9780646597843
ISBN (Print)9780646597843
Publication statusPublished - 2018
EventAustralasian Fluid Mechanics Conference 2018 - Adelaide Convention Centre, Adelaide, Australia
Duration: 10 Dec 201813 Dec 2018
Conference number: 21st
https://aomevents.eventsair.com/QuickEventWebsitePortal/21st-australasian-fluid-mechanics-conference/afmc2018

Conference

ConferenceAustralasian Fluid Mechanics Conference 2018
Abbreviated titleAFMC 2018
CountryAustralia
CityAdelaide
Period10/12/1813/12/18
Internet address

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