Field
Contents
TID
Table identification number.
No default (Integer > 0)
X1, X2
Table parameters.
No default (Real; X2 
0.0)
x#, y#
Tabular values.
No default (Real)
TABLED3 – Dynamic Load Tabular Function, Form 3
Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table.
|
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
|
TABLED3 |
TID |
X1 |
X2 |
|
|
|
|
|
|
|
|
x1 |
y1 |
x2 |
y2 |
x3 |
y3 |
x4 |
y4 |
|
|
|
x5 |
y5 |
… |
… |
… |
… |
… |
… |
|
|
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
|
TABLED3 |
15 |
126.9 |
30.0 |
|
|
|
|
|
|
|
|
2.9 |
2.9 |
3.6 |
4.7 |
5.2 |
5.7 |
ENDT |
|
|
|
Field |
Contents |
|
TID |
Table identification number. No default (Integer > 0) |
|
X1, X2 |
Table parameters. No default (Real; X2 |
|
x#, y# |
Tabular values. No default (Real) |
xi must be in either ascending or descending order, but not both.
Discontinuities may be specified between any two points except the two starting points or two end points. For example, in figure 1 discontinuities are allowed only between points x2 through x7. Also, if y is evaluated at a discontinuity, the average value of y is used. In figure 1, the value of y at x = x3 is y = (y3+y4)/2.
At least one continuation entry must be specified.
Any x, y pair may be ignored by placing 'SKIP' in either of the two fields used for that entry.
The end of the table is indicated by the existence of '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'.
The TABLED3 uses the algorithm:
where x is input to the table and y is returned. The table look-up is performed using interpolation within the table and linear extrapolation outside the table using the two starting or end points. See figure 1. No warning messages are issued if table data is input incorrectly.
Figure 1. Example of Table Extrapolation and Discontinuity
Linear extrapolation is not used for Fourier transform methods. The function is zero outside the range of the table.
For frequency-dependent loads, X1, X2, and x# is measured in cycles per unit time.
Go To
Guidelines for Bulk Data Entries