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Träfflista för sökning "WFRF:(Hylander Jonny 1955 ) srt2:(2010-2014)"

Sökning: WFRF:(Hylander Jonny 1955 ) > (2010-2014)

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1.
  • Möllerström, Erik, 1984-, et al. (författare)
  • Avoidance of resonances in a semi-guy-wired vertical axis wind turbine
  • 2014
  • Ingår i: Proceedings of EWEA 2014 - Annual Event (Conference), Barcelona, 10-13 March 2014.
  • Konferensbidrag (refereegranskat)abstract
    • Resonance analysis for a vertical axis wind turbine is performed. The turbine may be described as semi-guy wired, being bolted stiffly to the ground as well as supported by guy wires. The influence of the first mode eigen frequency of the guy wires and how it is affected by wind load is examined. Using beam theory, an analytical model for calculating the first mode eigen frequency of the guy wire for different wind loads is derived. The analytical model is verified with FEM-simulations and then used to assemble a diagram showing how to combine the wire size, inclination angle and pre-tension for an eigen frequency range over the 3P load for nominal rotational speed and for a certain effective spring force acting on the tower. This diagram, here called an EA-T diagram, may be used as a quick tool for comparing wire setups and a similar diagram can be used for other guy wired structures.
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2.
  • Möllerström, Erik, 1984-, et al. (författare)
  • Noise Propagation from a Vertical Axis Wind Turbine
  • 2014
  • Ingår i: Proceedings of 43rd International Congress on Noise Control Engineering. - Brisbane, QLD : Australian Acoustical Society. - 9780909882020 - 9780909882037 - 9780909882044
  • Konferensbidrag (refereegranskat)abstract
    • 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.
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  • Resultat 1-3 av 3

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