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Scatter diagram file format for spectral fatigue analysis

File format type = SCT2

"Load cases" number in the scatter diagram (sea-states number)

Spectrum type for all sea-states in the scatter diagram (1=JONSWAP, 2=OCHI-HUBBLE)

Wave type for the whole scatter diagram (1=Swell, 2= Local Sea)

For i =1 to Maximum number of sea-states,
   Sea-state number Hs (in m) Tp (in s) peak coefficient, probability (in %) [If Spectrum type = 1]
   Sea-state number, Hs1 (in m), Tp1 (in s), peak coefficient1, Hs2 (in m), Tp2 (in s), peak coefficient2, probability (in %) [If Spectrum type = 2]
End For

Examples :

A local sea scatter diagram of sea-states defined by JONSWAP spectrum will be defined as follows :

SCT2

  13
  1
  2
  1    0.75   10    2   0.53
  2    0.75   11.5  2   0.04
  3    0.75   12.5  2   0.04
  4    0.75   13.5  2   0.07
  5    0.75   14.5  2   0.37
  6    0.75   15.5  2   0.17
  7    0.75   16.5  2   0.06
  8    1.00   4     2   0.02
  9    1.00   5.5   2   0.04
  10   1.00   6.5   2   0.15
  11   1.00   8     2   2.75
  12   1.00   10    2   7.85
  13   1.00   11.5  2   5.08

A swell scatter diagram of sea-states defined by OCHI-HUBBLE spectrum will be defined as follows :

SCT2

    3
    2
    1
    1    0.75   10.0 6  0.50   4.0    2   0.12
    2    1.25   11.5 6  0.75   5.0    2   0.08
    3    1.50   12.5 6  1.00   6.0    2   0.04

Warning

The associated probabilities of occurrence are percentage values.

Note

Though this information is required, the wave type and sea-state number is actually not used by the GUI. It makes reading of the scatter diagram file easier.