This facility may be used to input any spectrum the user wishes. It is normally employed for input of non-deterministic spectra such as tank spectra, recorded full-scale spectra, or simply where the formulated spectrum is not yet available in Aqwa.

The program assumes that all frequencies are in radians/sec, unless a HRTZ data record has been used to change this to Hertz (cycles/sec).

      2   5  7   11         21        31
    - --- -- ---- ---------- --------- ---------
   |X|   |  |UDEF|XXXXXXXXXX|         |         |
    - --- -- ---- ---------- --------- ---------
       |  |   |                 |         |
       |  |   |                 |         |
       |  |   |                 | (2)Spectral Ordinate(F10.0)
       |  |   |                 |
       |  |   |                 |
       |  |   |              (1)Frequency Value(F10.0)
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on last data record in data category(A3)

(1) The value of frequency at which the value of the spectral ordinate (2) is given.

These frequencies must appear in ascending order (lowest first). The maximum number of frequencies is 200.

(2) Value of the spectral ordinate at the frequency given in columns 21-30.

If more than one spectrum is input, then the FINI data record must be used to separate each set of UDEF data records defining a spectrum. The format is shown below:

      2   5  7
    - --- -- ----
   |X|   |  |FINI|
    - --- -- ----
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on last data record in data category(A3)