Turbulance induced loads on a teetered rotor
Development of variable speed horizontal axis wind turbines has resulted in a need for an analysis code with a rotor speed degree-of-freedom. This study develops a five degree-of-freedom time domain computer code that evaluates blade and rotor, mean and cyclic loads with nonlinear aerodynamics toget...
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| Language: | en_US |
| Published: |
2013
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| Online Access: | http://hdl.handle.net/1957/37912 |
| Summary: | Development of variable speed horizontal axis wind
turbines has resulted in a need for an analysis code with a
rotor speed degree-of-freedom. This study develops a five
degree-of-freedom time domain computer code that evaluates
blade and rotor, mean and cyclic loads with nonlinear
aerodynamics together with atmospheric turbulence as a
forcing function.
Verification of the model is made by comparison of
loads predictions between ESI-80 wind turbine data and
analytical solutions. Results show good agreement for mean
and cyclic loads and teeter angle excursions.
A single-blade point turbulence simulation model is
optimized using a three-blade point turbulence simulation
model. The optimum point is the 80% radius location,
although a multiplying factor is needed to make
conservative fatigue cycle predictions of blade bending.
ESI-80 start-up and shutdown scenarios are examined,
prediction trends matched ESI-80 data. Three generator
models are investigated. Results show that generator
torque cycles are reduced and yearly energy capture
increased by 24% when a variable speed generator is
implemented. === Graduation date: 1991 |
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