Calculational model for first-mode eigenfrequency of a semi-guy-wired vertical-axis wind turbine tower. Issue 2 (April 2021)

• Record Type: Journal Article
• Authors: Möllerström, Erik; Ottermo, Fredric
• Is Part Of: Wind engineering. Volume 45:Issue 2(2021)
• Page Start: 205
• Page End: 212
• Publication Date: 2021-04
• Subjects: Vertical-axis wind turbine -- eigenfrequency -- natural frequency -- semi-guy-wired; Wind-pressure -- Periodicals; Winds -- Periodicals; Wind power -- Periodicals; Engineering meteorology -- Periodicals; Pression du vent; Vents; Énergie éolienne; Météorologie appliquée; Engineering meteorology; Wind power; Wind-pressure; Winds; Periodicals; 621.4505
• DOI: 10.1177/0309524X19882433
• Languages: English
• ISSNs: 0309-524X

Abstract

A simple model for accounting for tower mass when estimating the first-mode eigenfrequency of a semi-guy-wired tower has been derived. This extends previous work where an analytical model of the semi-guy-wired tower of a 200-kW vertical-axis wind turbine was developed. The model was primarily used to estimate the eigenfrequencies as a result of adding guy wires to a free-standing tower (thus creating a semi-guy-wired setup). However, a weakness with the model was that the tower mass was accounted for in a rough way that essentially ignored the guy wires, which gave a larger-than-necessary error. In this work, an effective top mass, that takes into account the tower mass and the constraints from the guy wires, is derived to achieve a higher accuracy when estimating the first-mode eigenfrequency. This, together with the earlier models, gives a more complete method to estimate the eigenfrequencies for a semi-guy-wired wind turbine.