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*Spectrum |
 
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*Spectrum
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*Spectrum |
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To specify the wave spectrum type to use for fatigue life calculations.
Refer to Wave Loading for further information on this feature.
One line specifying the spectrum type.
TYPE=Spectrum Type [, OPTION=Option]
This keyword is required for the Postprocessor with RAOs mode, but is not relevant to Postprocessor with Stress Spectra mode. Spectrum Type can be PIERSON-MOSKOWITZ or JONSWAP. Option can be TZ or TP, and defaults to TZ if omitted.
Input: |
Description |
Spectrum Type: |
The options are Pierson-Moskowitz and Jonswap. |
Period Type: |
The options are Tz (the default) and Tp. |
(a)The spectrum type is a necessary input when LifeFrequency is using stress RAOs to generate stress spectra from wave spectra for the various individual scatter diagram cells.
(b)When you specify Jonswap spectra, LifeFrequency uses the algorithm described in Jonswap Wave to calculate the Jonswap parameters fp, α and γ from the Hs and Tz/Tp values in the scatter diagram.