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TABRND1 |
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TABRND1 |
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»Click here to display Table of Contents«
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TABRND1 |
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TABRND1 |
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Bulk Data Entry
TABRND1 – Power Spectral Density Table
Description
Defines power spectral density as a tabular function of frequency for use in random analysis. Referenced on the RANDPS entry.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
TABRND1 |
ID |
XAXIS |
YAXIS |
FLAT |
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f1 |
g1 |
f2 |
g2 |
f3 |
g3 |
f4 |
g4 |
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Field |
Contents |
ID |
Table identification number. (Integer > 0) |
XAXIS |
Specifies a linear or logarithmic interpolation for the x-axis. See comment 5. Default = LINEAR (LINEAR or LOG) |
YAXIS |
Specifies a linear or logarithmic interpolation for the y-axis. See comment 5. Default = LINEAR (LINEAR or LOG) |
FLAT |
Specifies the handling method for y-values outside the specified range of x-values in the table. = 0: If an x-value input is outside the range of x-values specified on the Table, the corresponding y-value look up is performed using linear extrapolation from the two start or two end points. = 1: If an x-value input is outside the range of x-values specified on the Table, the corresponding y-value is equal to the start or end point, respectively. Default = 0 (0 or 1) |
fi |
Frequency value in cycles per unit time. Must be in either ascending or descending order, but not both. (Real > 0.0) |
gi |
Power spectral density. (Real) |
| 1. | Jumps between two points ( ) are allowed, but not at the end points. |
| 2. | At least two entries must be present. |
| 3. | Any f-g entry may be ignored by placing the BCD string "SKIP" in either of the two field used for that entry. |
| 4. | The end of the table is indicated by the existence of the BCD string "ENDT" in either of the two fields following the last entry. An error is detected if any continuations follow the entry containing the end-of-table flag "ENDT". |
| 5. | For FLAT=0 (default), TABRND1 mnemonic infers the use of the algorithm: |
G = gT(F)
Where, F is input to the table and G is returned. The table look-up gT (f) is performed using linear extrapolation outside the table using the last two end points at the appropriate table end. At jump points, the average gT (F) is used. There are no error returns from this table look-up procedure.
For FLAT=1, the same algorithm as FLAT=0 is used, except that values outside the range are not extrapolated. The corresponding start or end point y-values are used for all y-values outside the range.
See Also:
