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Noise Propagation from a Vertical Axis Wind Turbine
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. Högskolan i Halmstad, Energiteknik.ORCID iD: 0000-0001-9982-5317
Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET).
Högskolan i Halmstad, Energiteknik.
Högskolan i Halmstad, Energiteknik.
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2014 (English)In: Proceedings of 43rd International Congress on Noise Control Engineering: Internoise 2014 / [ed] John Davy, Charles Don, Terry McMinn, Liz Dowsett, Norm Broner & Marion Burgess, Brisbane, QLD: Australian Acoustical Society , 2014Conference paper (Refereed)
Abstract [en]

Initial noise measurements were performed on a 200kW vertical axis wind turbine (VAWT) and results were compared to that of a Vestas V27, a similar size horizontal axis wind turbine (HAWT). Multiple recording units were placed in line downwind of the turbine to investigate noise propagation. The frequency distribution of the noise were analyzed indicating that the VAWT has lower relative levels for frequencies under 3000 Hz, especially within 600-1200 Hz. Furthermore, VAWT noise seems to occur more around the same frequencies as the natural background noise, increasing masking probability. Results from propagation measurements seemed to indicate that noise declines more rapidly with distance for the VAWT then for the reference HAWT, possibly explained by the lower levels at low frequencies. Further investigation is needed to establish these differences and the 200 kW VAWT creates an opportunity doing so utilizing arguably the largest operational VAWT existing today.

Place, publisher, year, edition, pages
Brisbane, QLD: Australian Acoustical Society , 2014.
Keyword [en]
VAWT, Wind Turbine, Propagation
National Category
Energy Engineering
URN: urn:nbn:se:uu:diva-242264ISBN: 978-0-909882-02-0ISBN: 978-0-909882-03-7ISBN: 978-0-909882-04-4OAI: oai:DiVA.org:uu-242264DiVA: diva2:782920
inter.noise 2014, 43rd International Congress on Noise Control Engineering, Melbourne, Australia, November 16-19, 2014
Available from: 2014-11-25 Created: 2015-01-22 Last updated: 2015-01-27
In thesis
1. Vertical Axis Wind Turbines: Tower Dynamics and Noise
Open this publication in new window or tab >>Vertical Axis Wind Turbines: Tower Dynamics and Noise
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Vertical axis wind turbines (VAWTs) have with time been outrivaled by the today common and economically feasible horizontal axis wind turbines (HAWTs). However, VAWTs have several advantages such as the possibility to put the drive train at ground level, lower noise emissions and better scaling behavior which still make them interesting for research.

The work within this thesis is made in collaboration between the Department of Construction and Energy Engineering at Halmstad University and the Division for Electricity at Uppsala University. A 200 kW VAWT owned by the latter and situated close to Falkenberg in the southwest of Sweden has been the main subject of the research even if most learnings has been generalized to fit a typical vertical turbine. This particular turbine has a wooden tower which is semi-guy-wired, i.e. the tower is both firmly attached to the ground and supported by guy-wires.

This thesis has two main topics both regarding VAWTs: eigenfrequency of the tower and the noise generated from the turbine. The eigenfrequency of a semi-guy-wired tower is studied and an analytical expression describing this is produced and verified by experiments and simulations. The eigenfrequency of the wire itself and how it is affected by wind load are also studied.  The noise characteristics of VAWTs have been investigated, both theoretically and by noise measurement campaigns. Both noise emission and frequency distribution of VAWTs has been studied.

The work has resulted in analytical expressions for tower and wire eigenfrequency of a semi-guy-wired tower as well as recommendations for designing future towers for VAWTs. The noise emission of VAWTs has been studied and proven low compared to HAWTs. The noise frequency distribution of the 200 kW VAWT differs significantly from that of a similar size HAWTs with for example lower levels for frequencies below 3000 Hz.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2015. 61 p.
, UURIE / Uppsala universitet, Institutitionen för teknikvetenskaper, ISSN 0349-8352 ; 340-15L
VAWT, H-rotor, eigenfrequency, semi-guy-wired tower, noise emission, sound power level
National Category
Energy Engineering
urn:nbn:se:uu:diva-242267 (URN)
2015-01-16, Polhemsalen, Ångströmlaboratoriet, Uppsala, 13:45 (English)
Available from: 2015-01-27 Created: 2015-01-22 Last updated: 2015-01-27Bibliographically approved

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