Notes - Chapter 13 Summary

The following notes are taken from Wind Turbine Technology by Ahmad Hemami.

• The wind loads on all parts of a turbine ultimately transferred to the ground
• Each component must be strong enough to withstand their loads
• dependent on turbine rpm, and wind
• do not diminish when turbine is at rest, only changed
• Aerodynamic forces are top heavy, so the blades and rotors are subject to periodic forces
• Frequency of these forces is 3 times the speed of rotation
• Natural frequency is an intrinsic property of any mechanical component with flexibility
• each blade, hub structure, main shaft, tower are principle components that contribute to natural frequency
• natural frequencies must not be able to excite one another
• blade in particular and any other turbine components under cyclic loads are subject to fatigue
• vibration is undesirable, causes early failure in components

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