LIST OF FIGURES

Figure 1-1

 

Wind power plant in Altamont Pass, California

 

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



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