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PSD-DEFINITION
16.29
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PSD-DEFINITION: Define a cross-spectral density frequency function for random
response loading.
This option is used to define a frequency functio n for reference in the
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CORRELATION option to define the
frequency dependence of the random loa ding in the
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RANDOM RESPONSE analysis procedure.
Product: ABAQUS/Standard
Type: Model data
Level: Model
References:
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“Random response analysis,” Section 6.3.11 of the ABAQUS Analysis User’s Manual
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“UPSD,” Section 1.1.38 of the ABAQUS User Subroutines Reference Manual
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CORRELATION
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RANDOM RESPONSE
Required parameter:
NAME
Set this parameter equal to a label that will be used to refer to this frequency function.
Optional parameters:
DB REFERENCE
Set this parameter equal to the refer ence power value, in (load units)
2
. This parameter is required
when the frequency function is given in decibel units (TYPE=DB).
G
Set this parameter equal to the reference gravity acceleration; for example, 9.81 m/s
2
. The default
is G=1.0. This parameter can be used only with TYPE=BASE.
INPUT
Set this parameter equal to the name of the alternate input file containing the data lines for this
option. See “Input syntax rules,” Section 1.2.1 of the ABAQ US Analysis User’s Manual, for the
syntax of such file names. If this parameter is omitt ed, it is assumed that the data follow the key word
line.
TYPE
Set TYPE=BASE if this frequency function will be used to define a base motion.
16.29–1
ABAQUS Version 6.1 Module:
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