Damping of Offshore Wind Turbine Tower Vibrations by a Stroke Amplifying Brace

Mark Laier Brodersen; Jan Becker Høgsberg

doi:10.1016/j.egypro.2014.07.235

Damping of Offshore Wind Turbine Tower Vibrations by a Stroke Amplifying Brace

Mark Laier Brodersen, Jan Becker Høgsberg

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Abstract

The potential of installing dampers inside the tower of an offshore wind turbine is investigated through simulations. Dampers are installed at the bottom to act on the curvature of the tower, and it is shown that dampers installed in suitable braces have the potential to increase the critical damping ratio of the two lowest tower modes by 1 percent. By using a toggle-brace system, damper stroke is increased, while the damper force is reduced. Finally, by installing the dampers in a symmetric configuration, tuning for maximum damping is approximately independent of the orientation of the rotor, thereby making this installation of dampers feasible.

Original language	English
Journal	Energy Procedia
Volume	53
Issue number	C
Pages (from-to)	258-267
Number of pages	10
ISSN	1876-6102
DOIs	https://doi.org/10.1016/j.egypro.2014.07.235
Publication status	Published - 2014
Event	EERA DeepWind 2014 - 11th Deep Sea Offshore Wind R&D Conference - Radisson Blu Royal Garden Hotel, Trondheim, Norway Duration: 22 Jan 2014 → 24 Jan 2014 Conference number: 11 http://www.sintef.no/Projectweb/Deepwind_2014/

Conference

Conference	EERA DeepWind 2014 - 11th Deep Sea Offshore Wind R&D Conference
Number	11
Location	Radisson Blu Royal Garden Hotel
Country/Territory	Norway
City	Trondheim
Period	22/01/2014 → 24/01/2014
Internet address	http://www.sintef.no/Projectweb/Deepwind_2014/

Keywords

Stroke amplifying toggle brace
Passive damping
Fixed offshore wind turbine

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Damping of offshore windFinal published version, 270 KB

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title = "Damping of Offshore Wind Turbine Tower Vibrations by a Stroke Amplifying Brace",

abstract = "The potential of installing dampers inside the tower of an offshore wind turbine is investigated through simulations. Dampers are installed at the bottom to act on the curvature of the tower, and it is shown that dampers installed in suitable braces have the potential to increase the critical damping ratio of the two lowest tower modes by 1 percent. By using a toggle-brace system, damper stroke is increased, while the damper force is reduced. Finally, by installing the dampers in a symmetric configuration, tuning for maximum damping is approximately independent of the orientation of the rotor, thereby making this installation of dampers feasible.",

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year = "2014",

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language = "English",

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AU - Brodersen, Mark Laier

AU - Høgsberg, Jan Becker

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PY - 2014

Y1 - 2014

N2 - The potential of installing dampers inside the tower of an offshore wind turbine is investigated through simulations. Dampers are installed at the bottom to act on the curvature of the tower, and it is shown that dampers installed in suitable braces have the potential to increase the critical damping ratio of the two lowest tower modes by 1 percent. By using a toggle-brace system, damper stroke is increased, while the damper force is reduced. Finally, by installing the dampers in a symmetric configuration, tuning for maximum damping is approximately independent of the orientation of the rotor, thereby making this installation of dampers feasible.

AB - The potential of installing dampers inside the tower of an offshore wind turbine is investigated through simulations. Dampers are installed at the bottom to act on the curvature of the tower, and it is shown that dampers installed in suitable braces have the potential to increase the critical damping ratio of the two lowest tower modes by 1 percent. By using a toggle-brace system, damper stroke is increased, while the damper force is reduced. Finally, by installing the dampers in a symmetric configuration, tuning for maximum damping is approximately independent of the orientation of the rotor, thereby making this installation of dampers feasible.

KW - Stroke amplifying toggle brace

KW - Passive damping

KW - Fixed offshore wind turbine

U2 - 10.1016/j.egypro.2014.07.235

DO - 10.1016/j.egypro.2014.07.235

M3 - Conference article

VL - 53

SP - 258

EP - 267

JO - Energy Procedia

JF - Energy Procedia

SN - 1876-6102

IS - C

T2 - EERA DeepWind 2014 - 11th Deep Sea Offshore Wind R&D Conference

Y2 - 22 January 2014 through 24 January 2014

ER -

Damping of Offshore Wind Turbine Tower Vibrations by a Stroke Amplifying Brace

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