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MR-fluid Technology for Reduced Wear in Windturbine Bearings
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-5294-1855
2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Magnetorheology (MR) is a technology to enable active control of the viscosity of a material - typically afluid, but also semi-solid materials such as lubricating greases. Magnetic particles of nano to micron scale aremixed with the fluid and when subjected to a magnetic field the particles are aligned with the field, inducing ashear resistance - i.e. the effect of an increased viscosity - if applied in appropriate direction. This technology isfor example used in active dampers in sports cars, where electromagnets activated by a sensor systemcontrols the viscosity of the damper oil and the pressure in the dampers. This paper proposes a method ofusing MR technology to reduce wear in wind turbine bearings by enhancing the lubricant film in the maximumHertzian contact. Electromagnets are used to control the sequence of demagnetization and magnetization ofthe lubricant. Here the wear particles existing in the lubricant acts as guiding particles.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Applied Tribology, Power Generation, Lubricants, Ferrofluids
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-74087OAI: oai:DiVA.org:ltu-74087DiVA, id: diva2:1319032
Conference
STLE Annual Meeting, Nashville, Tennessee, USA, 19-23 May
Available from: 2019-05-29 Created: 2019-05-29 Last updated: 2019-09-17Bibliographically approved

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Westerberg, Lars-Göran

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