Fluid reaction surfaces (i.e. – impellers) – With measuring – testing – signalling or inspection means
Reexamination Certificate
2007-01-09
2007-01-09
Kershteyn, Igor (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With measuring, testing, signalling or inspection means
C416S043000, C415S026000, C415S048000, C415S118000
Reexamination Certificate
active
10357522
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 low-speed shaft. As a result, the main shaft and main shaft flange are displaced from their at rest or non-aerodynamic load positions. The amount of shaft flange displacement is measured using one 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 effect the blade pitch change needed to reduce the load and thereby reduce fatigue and loading on various turbine components.
REFERENCES:
patent: 4298313 (1981-11-01), Hohenemser
patent: 4420692 (1983-12-01), Kos et al.
patent: 4435647 (1984-03-01), Harner et al.
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: 6940186 (2005-09-01), Weitkamp
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.
David Lawrence LeMieux, “Rotor Blade Fatigue Reduction on Wind Turbines Using Pitch Control,” A Thesis submitted to the Department of General Engineering, Montanna Tech of The University of Montana, May 2001, pp. i-109, Butte, Montana, USA.
LeMieux David Lawrence
Pierce Kirk G.
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