Topic 2-Design Loads

Question 1

What are the typical design load cases to be considered in a wind turbine gearbox design, required by the IEC standard?

Answer 1

: The IEC standard requires the following design load cases to be considered:
Normal power production; Power production plus fault; Start up; Normal stop; Emergency stop;
Parked; Idling; and Transport/assembly.

Question 2

: Give an example of the causes of stochastic loads in a wind turbine.

Answer 2

Wind turbulence causes short‐term variations in wind speed thus rapidly varying aerodynamic
forces applied on the blades.

Question 3

Give three examples of the events causing transient loads in a WT.

Answer 3

Wind turbine starting up, stopping, wind gusts, blade pitching etc.