ABAQUS Volume II: I–Z - Manual (Page 314)

*PSD-DEFINITION
Set TYPE=FORCE (default) if this frequency function is given directly in power units.
Set TYPE=DB if this frequency function is defined in decibel units (see below). This option
cannot be used with the USER parameter.
USER
Include this parameter if the frequency function is defined in user subroutine UPSD. If this parameter
is included, no data lines are needed.
Data lines for TYPE=BASE or TYPE=FORCE:
First line:
1. Real part of the frequency function, in units
2
per frequency.
2. Imaginary part of the frequency function, in units
2
per frequency.
3. Frequency, in cycles/time.
Repeat this data line as often as necessary to define the frequency function.
Data lines for TYPE=DB:
First line:
1. Real part of the frequency function, in decibels.
2. Imaginary part of the frequency function, in decibels.
3. Frequency band number (1–15). Up to 15 standard frequency bands can be used.
Repeat this data line as often as necessary to define the frequency function in decibels.
To define the frequency function by a user subroutine (USER parameter included):
No data lines are used with this option if the USER parameter is specified. Instead, user subroutine
UPSD
must be used to define the frequency function.
16.29–2
ABAQUS Version 6.1 Module: ID:
Printed on: