Methods and apparatuses for wind turbine fatigue load measurement and assessment

An article comprising computer-readable medium having stored thereon instructions that, when executed, cause one or more processors to:

• determine position of a wind turbine component with respect to a fixed reference location with one or more sensors coupled with the wind turbine component;
• and
• perform fatigue load analysis based on output signals from the one or more sensors.

An apparatus comprising:

• one or more sensors to detect a condition caused by movement of a component of a wind turbine, the one or more sensors to generate condition signals indicating the condition of the component;
• control circuitry coupled with the one or more sensors to receive the condition signals and to determine a position of a wind turbine component atop a tower based on the condition signals from the one or more sensors, to transform the determined position from a frame of reference corresponding to sensor locations to a frame of reference corresponding to a lower portion of the tower and to perform fatigue load analysis on the transformed position corresponding to the lower portion of the tower.