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看看帮助文档就明白啦:
In its strictest sense, the term "expansion" means expanding the reduced solution to the full DOF set. The "reduced solution" is usually in terms of master DOF. In a modal analysis, however, the term "expansion" means writing mode shapes to the results file. That is, "expanding the modes" applies not just to reduced mode shapes from the reduced mode-extraction method, but to full mode shapes from the other mode-extraction methods as well. Thus, if you want to review mode shapes in the postprocessor, you must expand them (that is, write them to the results file).
请注意下面的注意事项:
Note
The full extraction methods also write the mode shapes to the results file by default during the modal analysis irrespective of the MXPAND command. To not write the mode shapes with MODOPT,LANB only, use MXPAND,-1 |
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