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TABLED2

TABLED2

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TABLED2

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Bulk Data Entry

TABLED2 – Dynamic Load Tabular Function, Form 2

Description

Defines a tabular function for use in generating frequency-dependent and time-dependent dynamic loads. Also contains parametric data for use with the table.

Format

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

TABLED2

TID

X1

 

FLAT

 

 

 

 

 

 

x1

y1

x2

y2

x3

y3

x4

y4

 

 

x5

y5

 

hmtoggle_plus1Example

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

TABLED2

15

-10.5

 

 

 

 

 

 

 

 

1.0

-4.5

2.0

-4.2

2.0

2.8

7.0

6.5

 

 

SKIP

SKIP

9.0

6.5

ENDT

 

 

 

 

Field

Contents

TID

Table identification number.

No default (Integer > 0)

X1

Table parameter. See comment 5.

No default (Real)

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)

x#, y#

Tabular values.

Any x, y pair may be ignored by placing 'SKIP' in either of the two fields used for that entry.

No default (Real)

Comments

1.xi must be in either ascending or descending order, but not both.
2.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.
3.At least one continuation entry must be specified.
4.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'.
5.For FLAT=0 (default), TABLED2 uses the algorithm:

y = yT (x - X1)

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.

table22

Figure 1. Example of Table Extrapolation and Discontinuity

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.

6.Linear extrapolation is not used for Fourier transform methods. The function is zero outside the range of the table.
7.For frequency-dependent loads, X1 and x# are measured in cycles per unit time.
8.This card is represented as a loadcollector in HyperMesh.

See Also:

Bulk Data Section

Guidelines for Bulk Data Entries

Bulk Data Entries by Function

The Input File