Non-stationary dynamic analysis of a wind turbine power drivetrain: Offshore considerations

Abstract This paper presents a multi-body model for studying the non-stationary dynamic behaviour of a wind turbine power drivetrain. The model includes some offshore considerations, such as the extra degrees of freedom and boundary conditions that installation on an offshore floating platform can add. The studied problem is an offshore implementation, with seafloor depths of the order of a hundred metres, making it necessary to use a floating platform. Special attention is paid to the characteristics of the combined offshore buoy support and detailed model of the power train, in order to assess the impacts of buoy movement on forces on gears and bearings. A multi-body analysis code was used to develop the model, and a conventional wind turbine set-up was implemented as an example. Gearbox dynamic behaviour was simulated for common manoeuvres such as a start-up and an emergency stop, and the results are presented and discussed.

[1]  M. Haddar,et al.  Nonlinear dynamics of a two-stage gear system with mesh stiffness fluctuation, bearing flexibility and backlash , 2009 .

[2]  Torgeir Moan,et al.  EFFECT OF SPAR-TYPE FLOATING WIND TURBINE NACELLE MOTIONS ON DRIVETRAIN DYNAMICS: DE-RISKING OFFSHORE WIND TURBINE DESIGN, Scientific proceedings of the European Wind Energy Conference (EWEA2012), 16-19 April 2012, Copenhagen, Denmark , 2012 .

[3]  Wim Desmet,et al.  Multibody modelling of varying complexity for modal behaviour analysis of wind turbine gearboxes , 2010 .

[4]  Robert G. Parker,et al.  Nonlinear Dynamics of Planetary Gears Using Analytical and Finite Element Models , 2007 .

[5]  F. Oyague.  Gearbox Modeling and Load Simulation of a Baseline 750-kW Wind Turbine Using State-of-the-Art Simulation Codes , 2009 .

[6]  Jason Jonkman,et al.  FAST User's Guide , 2005 .

[7]  Torgeir Moan,et al.  Model Fidelity Study of Dynamic Transient Loads in a Wind Turbine Gearbox: Preprint , 2013 .

[8]  Jason Jonkman,et al.  Dynamics of offshore floating wind turbines—model development and verification , 2009 .

[9]  Sandeep M. Vijayakar,et al.  A study of the relationship between the dynamic factors and the dynamic transmission error of spur gear pairs , 2007 .

[10]  T. Fakhfakh,et al.  Dynamic behavior of a two-stage gear train used in a fixed-speed wind turbine , 2011 .

[11]  A. Fernandez del Rincon,et al.  A model for the study of meshing stiffness in spur gear transmissions , 2013 .

[12]  B. Sweetman,et al.  Floating Offshore Wind Turbine Dynamics: Large-Angle Motions in Euler-Space , 2012 .

[13]  Fakher Chaari,et al.  Study of a spur gear dynamic behavior in transient regime , 2011 .

[14]  Y. Cai,et al.  Simulation on the Rotational Vibration of Helical Gears in Consideration of the Tooth Separation Phenomenon (A New Stiffness Function of Helical Involute Tooth Pair) , 1995 .