Environmental Engineering Reference
In-Depth Information
Fig. 9.6
The sixth sheet of the SLM spreadsheet
The SLM offers a much easier framework for small wind turbine design than
the expensive alternative of aero-elastic modeling that is routinely pursued for
large machines. It is in everyone's interests to continue to provide data for, and
testing of, the simple load model to improve its applicability while retaining its
simplicity.
Another necessary development of the standard is to address the partial load
factors in Table
9.7
. The high values used in the SLM reflect the simplistic nature
of the equations used. However, some terms in those equations, such as the
Coriolis terms in (IEC 28-30) are based on exact equations and so should attract
lower safety factors when our knowledge of yaw behaviour has improved suffi-
ciently to make firmer judgements on the maximum yaw rate.
9.8.1 Further Reading
The SLM is a good starting point for turbine structural and dynamic analysis, but it
is only a starting point. Aero-elastic modeling has been used for small turbines and
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