Optional parameters – ABAQUS Volume II: I–Z User Manual
Page 401
*SELECT EIGENMODES
18.7
*SELECT EIGENMODES:
Select the modes to be used in a modal dynamic analysis.
This option selects the modes to be used in a dynamic analysis based on modes or in a complex eigenvalue
extraction analysis. Only one option per step can be used. If this option is not used, all modes extracted in
the prior *FREQUENCY step will be used, including residual modes if they were activated.
Product:
ABAQUS/Standard
Type:
History data
Level:
Step
References:
•
“Implicit dynamic analysis using direct integration,” Section 6.3.2 of the ABAQUS Analysis User’s
Manual
•
“Complex eigenvalue extraction,” Section 6.3.6 of the ABAQUS Analysis User’s Manual
•
“Transient modal dynamic analysis,” Section 6.3.7 of the ABAQUS Analysis User’s Manual
•
“Mode-based steady-state dynamic analysis,” Section 6.3.8 of the ABAQUS Analysis User’s Manual
•
“Subspace-based steady-state dynamic analysis,” Section 6.3.9 of the ABAQUS Analysis User’s Manual
•
“Response spectrum analysis,” Section 6.3.10 of the ABAQUS Analysis User’s Manual
•
“Random response analysis,” Section 6.3.11 of the ABAQUS Analysis User’s Manual
•
*MODAL DAMPING
Optional parameters:
GENERATE
If this parameter is included, each data line should give a first mode,
; a last mode,
; and the
increment in mode numbers between these modes, i. Then all modes going from
to
in steps
of i will be added to the set. i must be an integer such that
is a whole number (not a
fraction).
This parameter can be used only with DEFINITION=MODE NUMBERS.
DEFINITION
Set DEFINITION=MODE NUMBERS (default) to indicate that the selected modes are given as a
collection of mode numbers.
Set DEFINITION= FREQUENCY RANGE to indicate that the modes are selected from the
specified frequency ranges including frequency boundaries. Frequency ranges can be discontinuous.
If both the *MODAL DAMPING and *SELECT EIGENMODES options are used in the same
step, the DEFINITION parameter must be set equal to the same value in both options.
18.7–1
ABAQUS Version 6.1
Module: ID:
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