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, Volume 11, Issue 4, pp 42–47 | Cite as

Bend-twist Coupling on Rotor Blades for Wind Turbines

  • Zhuzhell Montano
  • Michael Kühn
  • Elia Daniele
  • Jan Stüve
Design Rotor Blade

Scientists at DLR and Fraunhofer IWES have developed a rotor blade with a bend twist coupling rotor blade that turns out of the wind independently when strong loads occurs. This passive measure eases loads on the rotor blades and the entire turbine.

Load-optimized Rotor Blades

Wind energy industry trends are moving towards wind energy plants with longer rotor blades to increase energy yield, especially onshore. However, larger rotor blades mean larger loads for the wind turbine to withstand, this while needing to preserve weight as low as possible. The strongest structural loading conditions usually happen under gust loads. One way of reducing these induced loads is to use the Bend-Twist Coupling (BTC) effect, where rotor blades independently position themselves optimally towards the wind to minimize loads.

This approach was realized in a rotor blade design and was one of the results of the SmartBlades1 project , which ran between 2012 and 2016. The project also examined two additional...


  1. [1]
    IEC 61400-1, Ed. 3: Wind Turbine — Part 1: Design Requirements, EN 61400-1:2005(E)Google Scholar
  2. [2]
    Bätge, M.: Design of a 20 m Blade for the Demonstration Turbine, Deliverable Nos. and of the SmartBlade Project, Fraunhofer IWES, FKZ 0325601 B, 2016Google Scholar
  3. [3]
    IEC 61400-23, Ed. 1: Wind Turbine Generator System — Part 23: Full-Scale Structural Testing of Rotor Blades for WTGSs, April 2014Google Scholar
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    Rules and Guidelines, IV Industrial Services, 1. Guideline for the Certification of Wind Turbines, Edition 2010, Germanischer Lloyd Industrial Services GmbHGoogle Scholar

Copyright information

© Springer Fachmedien Wiesbaden GmbH, part of Springer Nature 2018

Authors and Affiliations

  • Zhuzhell Montano
    • 1
  • Michael Kühn
    • 2
  • Elia Daniele
    • 3
  • Jan Stüve
    • 2
  1. 1.Department of Adaptive SystemsInstitute of Composite Structures and Adaptive Systems of the German Aerospace CenterBraunschweigGermany
  2. 2.Department of Composite Process TechnologyInstitute of Composite Structures and Adaptive Systems of the German Aerospace CenterStadeGermany
  3. 3.Division of Wind Park Planning and OperationFraunhofer Institute for Wind Energy Systems IWESOldenburgGermany

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