|
Figure 1-1
|
|
Wind power plant in Altamont Pass, California
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|
6
|
|
Figure 1-2
|
|
World energy generation by wind power plants during 1989
|
|
10
|
|
Figure 1-3
|
|
Growth of generating capacity for California wind power plants
|
|
10
|
|
Figure 1-4
|
|
Growth of annual energy production for California wind power plants
|
|
12
|
|
Figure 1-5
|
|
Wind turbine subsystems
|
|
13
|
|
Figure 1-6
|
|
Wind turbine power curve
|
|
15
|
|
Figure 1-7
|
|
Wind flow field and turbine loads
|
|
16
|
|
Figure 1-8
|
|
Comparison of logarithmic power in the wind with a wind turbine power curve
|
|
17
|
|
Figure 1-9
|
|
Wind turbine blade control methods
|
|
19
|
|
Figure 1-10
|
|
Accumulation of fatigue cycles
|
|
22
|
|
Figure 2-1
|
|
Process necessary to analyze composite blades
|
|
29
|
|
Figure 3-1
|
|
Trends of longitudinal tensile fatigue S-N data for unidirectional composites with various fibers
|
|
38
|
|
Figure 3-2
|
|
Schematics of various fiber preforms
|
|
39
|
|
Figure 3-3
|
|
Stress-strain relationships of glass/epoxy laminates under uniaxial tension
|
|
45
|
|
Figure 3-4
|
|
Modes of damage growth in composite laminate under fatigue
|
|
47
|
|
Figure 3-5
|
|
Laminate directional properties and shear directional nomenclature
|
|
52
|
|
Figure 3-6
|
|
Wood strength change due to temperature at two moisture conditions
|
|
55
|
|
Figure 3-7
|
|
Wood moisture content versus atmospheric relative humidity
|
|
55
|
|
Figure 3-8
|
|
Effect of moisture content on laminate mechanical properties
|
|
56
|
|
Figure 3-9
|
|
Typical tensile fatigue strength of wood/epoxy laminate
|
|
56
|
|
Figure 3-10
|
|
Typical compression fatigue strength of wood/epoxy laminate
|
|
57
|
|
Figure 3-11
|
|
Typical reversed stress fatigue strength of wood/epoxy laminate
|
|
57
|
