文档介绍：W IND E NGINE E R ING V OL UM E 26, NO. 4, 2002 PP 211–220 211
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Wind Turbine Structural Dynamics –
A Review of the Principles for Modern Power
Generation, Onshore and Offshore
Jan van der Tempel and David-Pieter Molenaar
DUWIND, Delft University of Technology, Stevinweg 1, Delft,herlands
email <j.******@ .******@>
ABSTRACT
W ind turbines for electricity production have two seemingly opposing constraints; they
need to be structural secure yet of low cost. To meet the first constraint, it would be an
obvious choice to design a stiff structure of consequently large mass but this would drive up
the cost. By reducing the mass a more cost effective turbine can be realized. However, such
lightweight structures are by definition more flexible. To design a cost effective flexible
system, thorough understanding of the dynamics is essential. This paper review s the
theoretical basics of the dynamic design options and applies these to realistic situations,
including offshore machines under wave action. The wind energy converter and the support
structure form an integrated dy namic system that must be developed in m utual
interdependency and close co-operation. This paper provides a contribution to this
integration process by ex tending the design approach initiated in the Opti-OW ECS study [1]
and the work of K ühn [2].
1. INTRODUCTION
All newly developed wind turbines share the same characteristics: they are larger than their
predecessors and of the variable speed concept [3]. ‘Multi-megawatt’ is now a sy nonym for
‘greater than 2 MW ’, with 5 MW in reach. W hile the output of the turbines is boosted with
larger rotors and more powerful generators, the cost is kept as low as possible by reducing the
overall weight. This means that the turbine system es more flexible and thus more
dynamically active.
To make sure the dy namic activity does not influence the sy stem negatively, fully
integ