Com- GUI Path
mand
Option
Main Menu> Solution> Analysis Type> Analysis
Options
Mode-extraction Method MODOPT
Main Menu> Solution> Analysis Type> Analysis
Options
Number of Modes to Extract MODOPT
Main Menu> Solution> Analysis Type> Analysis
Options
Number of Modes to Expand (see MXPAND
Note below)
Main Menu> Solution> Analysis Type> Analysis
Options
Mass Matrix Formulation LUMPM
Main Menu> Solution> Analysis Type> Analysis
Options
Prestress Effects Calculation PSTRES
Main Menu> Solution> Load Step Opts > Out-
put Ctrls > DB/Results Files
Control Output to the Results File OUTRES
This command cannot be accessed from a
menu.
Residual Vector Calculation RESVEC
When you specify a modal analysis, a Solution menu that is appropriate for modal analyses appears.
The Solution menu is either “abridged” or “unabridged,” depending on the actions you took prior to
this step in the current session.The abridged menu contains only those solution options that are valid
and/or recommended for modal analyses. If you are on the abridged Solution menu and you want to
access other solution options (that is, solution options that are valid for you to use, but their use may
not be encouraged for this type of analysis), select the Unabridged Menu option. For details, see Using
Abridged Solution Menus in the Basic Analysis Guide.
3.4.2.1. Option: New Analysis (ANTYPE)
Select New Analysis. If you wish to compute additional load vectors, residual vectors, or enforced motion
terms subsequent to a prior modal analysis, select Restart.
3.4.2.2. Option: Analysis Type: Modal (ANTYPE)
Use this option to specify a modal analysis.
3.4.2.3. Option: Mode-Extraction Method (MODOPT)
Select one of the following mode-extraction methods:
Mode-Extraction Comments
Method
Used for large symmetric eigenvalue problems. This method
uses the sparse matrix solver, overriding any solver specified
via the EQSLV command.
Block Lanczos
Used for very large symmetric eigenvalue problems (500,000+
degrees of freedom), and is especially useful to obtain a solu-
PCG Lanczos
tion for the lowest modes to learn how the model will behave.
This method uses the PCG iterative solver and therefore has
the same limitations (that is, it does not support superele-
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Applying Loads and Obtaining the Solution