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The Effect of Rotor Size on the Teeter Behavior of Two‐Bladed Wind Turbines.

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Title: The Effect of Rotor Size on the Teeter Behavior of Two‐Bladed Wind Turbines.
Authors: Anstock, Fabian Bölle né1 (AUTHOR), Schorbach, Vera1 (AUTHOR) vera.schorbach@haw‐hamburg.de
Source: Wind Energy. Nov2025, Vol. 28 Issue 11, p1-15. 15p.
Subjects: Rotor dynamics, Damping (Mechanics), Energy conservation, Turbine blades, Computer simulation, Mechanical loads, Oscillations
Abstract: The rotor of a two‐bladed turbine allows the implementation of an additional degree of freedom around the rotating hub y‐axis. This idea is over 60 years old, and various research and commercial turbines have had a teeter hinge. Fatigue and extreme loads can be reduced significantly with a teeter hinge. Teetered turbines have been mainly below or around a rotor diameter of 100 m, and most of the teetered turbines have been built in the 1980s. Today, rotor blades have become much larger and, in relation to their sizes, lighter (indicated by the Lock number, the ratio of aerodynamic, and inertia forces). Both have an impact on teeter dynamics. This paper investigates the effects of teeter behavior over a wide range of turbine sizes using the analytical equations of the teeter movement combined with numerical simulations of the CART2 (600 kW), 2‐B Energy's 2B6 (6 MW), and the 2B20HAW‐T (20 MW, based on the INNWIND.eu turbine). It extends the existing teeter equations by the effects of pitch‐teeter‐velocity coupling and concludes that modern turbines with a high Lock number show a significant increase in aerodynamic damping, which leads to a different teeter behavior, making this rather old turbine concept worth considering in more detail. [ABSTRACT FROM AUTHOR]
Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: The Effect of Rotor Size on the Teeter Behavior of Two‐Bladed Wind Turbines.
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  Data: <searchLink fieldCode="AR" term="%22Anstock%2C+Fabian Bölle né%22">Anstock, Fabian Bölle né</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Schorbach%2C+Vera%22">Schorbach, Vera</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> vera.schorbach@haw‐hamburg.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Wind+Energy%22">Wind Energy</searchLink>. Nov2025, Vol. 28 Issue 11, p1-15. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Rotor+dynamics%22">Rotor dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Damping+%28Mechanics%29%22">Damping (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+conservation%22">Energy conservation</searchLink><br /><searchLink fieldCode="DE" term="%22Turbine+blades%22">Turbine blades</searchLink><br /><searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+loads%22">Mechanical loads</searchLink><br /><searchLink fieldCode="DE" term="%22Oscillations%22">Oscillations</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The rotor of a two‐bladed turbine allows the implementation of an additional degree of freedom around the rotating hub y‐axis. This idea is over 60 years old, and various research and commercial turbines have had a teeter hinge. Fatigue and extreme loads can be reduced significantly with a teeter hinge. Teetered turbines have been mainly below or around a rotor diameter of 100 m, and most of the teetered turbines have been built in the 1980s. Today, rotor blades have become much larger and, in relation to their sizes, lighter (indicated by the Lock number, the ratio of aerodynamic, and inertia forces). Both have an impact on teeter dynamics. This paper investigates the effects of teeter behavior over a wide range of turbine sizes using the analytical equations of the teeter movement combined with numerical simulations of the CART2 (600 kW), 2‐B Energy's 2B6 (6 MW), and the 2B20HAW‐T (20 MW, based on the INNWIND.eu turbine). It extends the existing teeter equations by the effects of pitch‐teeter‐velocity coupling and concludes that modern turbines with a high Lock number show a significant increase in aerodynamic damping, which leads to a different teeter behavior, making this rather old turbine concept worth considering in more detail. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1002/we.70069
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 1
    Subjects:
      – SubjectFull: Rotor dynamics
        Type: general
      – SubjectFull: Damping (Mechanics)
        Type: general
      – SubjectFull: Energy conservation
        Type: general
      – SubjectFull: Turbine blades
        Type: general
      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Mechanical loads
        Type: general
      – SubjectFull: Oscillations
        Type: general
    Titles:
      – TitleFull: The Effect of Rotor Size on the Teeter Behavior of Two‐Bladed Wind Turbines.
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            NameFull: Anstock, Fabian Bölle né
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            NameFull: Schorbach, Vera
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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              Value: 28
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              Value: 11
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            – TitleFull: Wind Energy
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