Extreme Predictions

This obsolete calculation was used to estimate lifetime extreme loads from a sample time history. Use Extreme load extrapolation instead.

Click the Select... buttons to select channels to be processed and the signal representing rotor azimuth. If you have selected multiple channels you will be able to specify a number of load cases and variables to be processed in a single calculation, and the results for each load case will then be stored as additional outputs of that load case. Then enter the following information:

• Time spent at specified condition: the total amount of time during the turbine lifetime for which the conditions of the sample time history are considered representative.

Then enter the user options associated with spectral analysis as required.

Then choose either automatic or manual selection of data. Automatic selection is usually adequate, but if entered manually, the parameter required is:

• Number of bins: the number of azimuthal bins to be used in the calculation (minimum 4, maximum 144). More bins will generally give a more accurate result, but do not choose more bins than the number of signal samples in one revolution of the rotor.

Last updated 05-08-2024