Environmental Engineering Reference
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the analogies began to break down. Many researchers highlight
that the aviation-inspired predominantly US technology had a
design focus that was less well suited to the wind turbine industry
due to the diferent operational characteristics of the sectors.
Maegaard notes that while a helicopter undergoes overhaul every
200 hours of operation, “a wind turbine has to run for thousands
of hours before having an overhaul” and the principles for over
dimensioning and emphasis on reliability were more suited to
the wind turbine industry (Maegaard, 2010).
Figure 5.23
Testing of un-twisted modern blades at the Folkecenter
1984. Civil engineer Jacob Bugge constructed the hub, and
the nacelle was designed by Preben Maegaard. Long blades
were gradually shortened to verify optimal proportions.
One of the earliest employees of NIVE, engineer Jacob Bugge
published
22
targeted at
wind turbine designers with a number of formulas and equations
to calculate, among other things, the design loads for wind turbines
of diferent types. The topic's chapter on “dimensioning” of wind
turbine components highlights the design principles utilised by
NIVE and similarly by other adopters of the “Danish Concept” in its
chapter introduction:
“A fairly safe fixing of the dimensioning loads, for example as seen
in the diferent loading standards, requires fairly extensive practical
experience. Such experience with wind turbines has not yet been
fulfilled. It is therefore important to consider such uncertainty in
developing a proposal for design at present. The main three sources
for this uncertainty are:
Bogen om Vindmoeller
(
Book of Windmills
)
• There is no certain knowledge of the wind loads acting on a
windmill.
22
Bugge, J. (1978)
Bogen om vindmøller
, Clausen Bøger, Copenhagen.
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