Flexcom > Data Inputs > $LIFEFREQUENCY

This section corresponds to LifeFrequency, which is a frequency domain fatigue postprocessor to Flexcom. Refer to Frequency Domain Fatigue Analysis for further details.

This section contains the following keywords:

•*BLOCK is used to input the fatigue analysis wave scatter diagram, including the definition of blocks and/or reference seastates as appropriate.

•*DIRECTION is used to specify long-term directionality data.

•*FATIGUE DATA is used to assign fatigue data to hot spot sets.

•*HOT SPOT SETS is used to define the fatigue analysis hot spots - these are the locations on the structure for which fatigue life estimates are required.

•*NAME is used to specify a title for a LifeFrequency analysis run.

•*PDF is used to specify the probability density function to be used in calculating fatigue life estimates from stress spectra.

•*PROPERTIES is used to assign effective structural properties to hot spot sets for use in calculating stresses.

•*SEASTATE FILES is used to specify all of the Flexcom random sea analyses on which the LifeFrequency calculations are to be based, and to tabulate the percentage occurrences of the corresponding seastates.

•*S-N CURVE is used to define fatigue analysis S-N curves.

•*SPECTRUM is used to specify the wave spectrum type to use for fatigue life calculations.