Environmental Engineering Reference
In-Depth Information
Figure 4: Full-scale testing: a 61.5-m long wind turbine blade subjected to static
test (fl apwise direction) [Courtesy of LM Glasfi ber A/S].
Additionally, tests can be used to determine blade properties in order to validate
some vital design assumptions used as inputs for the design load calculations.
Finally, full-scale tests give valuable information to the designers on how the
structure behaves in the test situation and which structural details that are important
and should be included in the structural models for design. Especially, valuable
information is obtained if the blade is tested to failure.
3.2 Certifi cation tests (static and cyclic)
According to DNV [7], it is required that the test program for a blade type shall be
composed of at least the following tests in this order:
Mass, centre of gravity, stiffness distribution and natural frequencies
Static tests
Fatigue load tests
Post fatigue static tests
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