Wind Energy

Cover image for Vol. 17 Issue 4

April 2014

Volume 17, Issue 4

Pages 505–669

  1. Research Articles

    1. Top of page
    2. Research Articles
    1. Amplitude modulations in planetary gears (pages 505–517)

      Huageng Luo, Charles Hatch, Jesse Hanna, Matt Kalb, Adam Weiss, John Winterton, Murat Inalpolat and Christopher Dannehy

      Version of Record online: 27 SEP 2012 | DOI: 10.1002/we.1545

      A planetary gear set introduces complicated gear vibration frequency structures, especially in sequentially phased planetary gear sets. Frequency components from a fixed sensor can be enhanced and/or canceled with different planets and ring gear configurations. The novelty of this study lies in the following: (i) an amplitude modulation based formula and simple trigonometric function manipulations, instead of a mathematical function convolutions, are used to reveal the major physical phenomena in a planetary gearbox; (ii) the formulation used in this study permits unlimited modulation indices as well as unrestricted number of planets in the gearbox; and (iii) the results expressed are more quantitative under the assumptions of identical planets.

    2. Verification of aero-elastic offshore wind turbine design codes under IEA Wind Task XXIII (pages 519–547)

      Fabian Vorpahl, Michael Strobel, Jason M. Jonkman, Torben J. Larsen, Patrik Passon and James Nichols

      Version of Record online: 18 MAR 2013 | DOI: 10.1002/we.1588

    3. Full-scale test of trailing edge flaps on a Vestas V27 wind turbine: active load reduction and system identification (pages 549–564)

      Damien Castaignet, Thanasis Barlas, Thomas Buhl, Niels K. Poulsen, Jens Jakob Wedel-Heinen, Niels A. Olesen, Christian Bak and Taeseong Kim

      Version of Record online: 7 JAN 2013 | DOI: 10.1002/we.1589

    4. NREL VI rotor blade: numerical investigation and winglet design and optimization using CFD (pages 605–626)

      Monier A. Elfarra, Nilay Sezer-Uzol and I. Sinan Akmandor

      Version of Record online: 6 FEB 2013 | DOI: 10.1002/we.1593

    5. State-space representation of the wind flow model in wind farms (pages 627–639)

      Maryam Soleimanzadeh, Rafael Wisniewski and Arno Brand

      Version of Record online: 7 FEB 2013 | DOI: 10.1002/we.1594

    6. Self-induced vibrations of a DU96-W-180 airfoil in stall (pages 641–655)

      Witold Robert Skrzypiński, Mac Gaunaa, Niels Sørensen, Frederik Zahle and Joachim Heinz

      Version of Record online: 13 JUN 2013 | DOI: 10.1002/we.1596

    7. A simple atmospheric boundary layer model applied to large eddy simulations of wind turbine wakes (pages 657–669)

      Niels Troldborg, Jens N. Sørensen, Robert Mikkelsen and Niels N. Sørensen

      Version of Record online: 8 APR 2013 | DOI: 10.1002/we.1608