Fluid reaction surfaces (i.e. – impellers) – With measuring – testing – signalling or inspection means
Reexamination Certificate
2006-02-28
2006-02-28
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With measuring, testing, signalling or inspection means
C416S043000, C415S026000, C415S048000, C415S118000
Reexamination Certificate
active
07004724
ABSTRACT:
Vertical and horizontal wind shears, yaw misalignment and/or turbulence act together to produce asymmetric loading across a wind turbine rotor. The resultant load produces bending moments in the blades that are reacted through the hub and subsequently to the main shaft. As a result, the main shaft may be radially displaced from its at rest positions. The amount of radial displacement is measured using two or more sensors. The output signals from the sensors are used to determine the magnitude and/or the orientation of the resultant rotor load. This information is used to affect the blade pitch change or other action with similar system effect to reduce the asymmetric load and thereby reduce fatigue and loading on various turbine components.
REFERENCES:
patent: 4298313 (1981-11-01), Hohenemser et al.
patent: 4420692 (1983-12-01), Kos et al.
patent: 4435647 (1984-03-01), Harner
patent: 4495423 (1985-01-01), Rogers
patent: 4613762 (1986-09-01), Soderholm
patent: 5140856 (1992-08-01), Larsen
patent: 5225712 (1993-07-01), Erdman
patent: 6361275 (2002-03-01), Wobben
patent: WO 01/33075 (2001-05-01), None
P. Caselitz et al., “Reduction of Fatigue Loads on Wind Energy Converters by Advanced Control Methods,” European Wind Energy Conference, Oct. 1997, pp. 1-4, Dublin Castle, Ireland.
N. Kelley et al., “The NREL Large-Scale Turbine Inflow and Response Experiment-Preliminary Results,” National Wind Technology Center, National Renewable Energy Laboratory, pp. 412-426, #AIAA-2002-0064, Golden, Colorado, USA.
David Lawrence LeMieux, “Rotor Blade Fatigue Reduction on Wind Turbines Using Pitch Control,” A Thesis submitted to the Department of General Engineering, Montana Tech of The University of Montana, May 2001, pp. i-109, Butte, Montana, USA.
Blakemore Ralph W.
LeMieux David Lawrence
Pierce Kirk G.
Blakely , Sokoloff, Taylor & Zafman LLP
General Electric Company
Kershteyn Igor
Look Edward K.
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