SPCFORCE - Output Request
The SPCFORCE command can be used in the I/O Options or Subcase Information sections to request single-point force of constraint vector output for all subcases or individual subcases respectively.
SPCFORCE (format,form,type) = option
Argument |
Options |
Description |
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format |
<HM, H3D,
OPTI, |
HM: |
Results are output in HyperMesh results format (.res file). |
| Default = blank |
H3D: |
Results are output in Hyper3D format (.h3d file). |
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OPTI: |
Results are output in OptiStruct results format (.spcf file). |
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PUNCH: |
Results are output in Nastran punch results format (.pch file). |
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OUTPUT2: |
Results are output in Nastran output2 format (.op2 file). |
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blank: |
Results are output in all active formats for which the result is available. |
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form |
<COMPLEX, REAL, IMAG, PHASE, BOTH> |
COMPLEX, blank: |
Provides a combined magnitude/phase form of complex output to the .res file if HM output format is chosen. The REAL form of complex output is used for other formats if they are not specifically defined. (Phase output is in degrees). |
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Default = COMPLEX |
REAL, IMAG: |
Provides rectangular format (real and imaginary) of complex output. |
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PHASE: |
Provides polar format (magnitude and phase) of complex output. Phase output is in degrees. |
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BOTH: |
Provides both polar and rectangular formats of complex output. |
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type |
<SPARSE, ALL> |
ALL: |
Single-point force of constraint is output for all selected nodes. |
| Default = SPARSE |
SPARSE: |
Single-point force of constraint is output only for selected nodes with a component with a magnitude of 1.0E-10 or greater. |
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option |
<YES, ALL,
|
YES, ALL, blank: |
Single-point force of constraint is output for all nodes. |
| Default = ALL |
NO, NONE: |
Single-point force of constraint is not output. |
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SID: |
If a set ID is given, single-point force of constraint is output only for nodes listed in that set. |
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When an SPCFORCE command is not present, single-point force of constraint vector is not output.
Single-point force of constraint values are highly dependent on mesh density and type of elements used.
For modal frequency analysis, residual forces are zero only in modal space. Therefore, the single-point force of constraint vector may not be accurate unless all modes are used in the modal solution. When all possible modes in the model space are used, the modal frequency analysis solution should match the direct frequency analysis solution.
When single-point force of constraint is calculated, the reaction force summary, the load summary, and the strain energy residuals for the affected subcases are written to the .out file.
The form argument is only applicable for frequency response analysis. It is ignored in other instances.
The form BOTH does not apply to the .frf output files. Results are output to these files using the rectangular form of complex output when BOTH is the chosen form.
Only formats that have been activated by an OUTPUT or FORMAT command are valid for use on this card.
Multiple formats are allowed on the same entry; these should be comma separated. If no format is specified, then this output control applies to all formats defined by OUTPUT or FORMAT commands for which the result is available. See Results Output by OptiStruct for information on which results are available in which formats.
Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT. In previous versions of OptiStruct, a combination of the I/O options FORMAT and RESULTS were used; this method is still supported, but not recommended as it does not allow different frequencies for different formats.
Go To
Alphabetical List of I/O Options