Download Abaqus Release Notes - Abaqus 6.10 Documentation

ANALYSIS PROCEDURES
Description: The integration of generalized response power spectral density (PSD) in random response has
been modified to yield more accurate variances (and, consequently, more accurate RMS responses) at starting
and intermediate frequencies. This also results in zero values for RMS responses at the starting frequency.
The previous integration scheme provided approximate RMS responses at all frequencies but the last one.
Therefore, a nonzero value was observed at the first frequency.
References:
Abaqus Analysis User’s Manual
•
“Random response analysis,” Section 6.3.11
Abaqus Theory Manual
•
“Random response analysis,” Section 2.5.8
6.12
Use of arbitrary dynamic modes for substructure generation
Product: Abaqus/Standard
Benefits: The substructure retained degrees of freedom no longer have to be constrained in the frequency
extraction step.
Description: Free or mixed interface eigenmodes can now be selected to generate a dynamic substructure.
You can get a better approximation of the model’s dynamic response with fewer dynamic modes when using
free or mixed interface eigenmodes as compared to using a fixed interface. The dynamic substructure also
enables retention of nodes from the “cloud” of a distributing coupling.
References:
Abaqus Analysis User’s Manual
•
“Defining substructures,” Section 10.1.2
Abaqus Keywords Reference Manual
•
•
*SELECT EIGENMODES
*SUBSTRUCTURE GENERATE
6.13
Enhancements to coupled structural-acoustic analysis
Product: Abaqus/Standard
Benefits: Performance is improved and enhanced functionality is available in coupled structural-acoustic
steady-state dynamic analyses.
6–15
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