ACCELERATION - Output Request
The ACCELERATION command can be used in the I/O Options or Subcase Information sections to request acceleration vector output for all subcases or individual subcases respectively.
ACCELERATION (sorting,format,form) = option
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Argument |
Options |
Description |
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sorting |
<SORT1, SORT2> Default = blank |
This argument only applies for PUNCH format (.pch file) output for frequency response and transient subcases. It will be ignored without warning if used elsewhere. |
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SORT1: |
Results for each frequency/timestep are grouped together. |
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SORT2: |
Results for each grid/element are grouped together. |
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blank: |
SORT1 is used for all results except for transient analysis, whereSORT2 is used. |
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format |
<HM, H3D, HG, OPTI, PUNCH, OUTPUT2, blank>
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HM: |
Results are output in HyperMesh binary format (.res file). |
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Default = blank |
H3D: |
Results are output in Hyper3D format (.h3d file). |
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HG: |
Results are output in HyperGraph presentation format (_freq.mvw file and _tran.mvw file) – see OUTPUT keywords HGFREQ and HGTRANS. |
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OPTI: |
Results are output in OptiStruct results format (.disp 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> Default = COMPLEX |
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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REAL or IMAG: |
Provides rectangular format (real and imaginary) of complex output. Phase output is in degrees. |
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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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option |
<YES, ALL, NO, NONE, SID> Default = ALL |
YES, ALL, blank: |
Acceleration is output for all nodes. |
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NO, NONE: |
Acceleration is not output. |
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SID: |
If a set ID is given, acceleration is output only for nodes listed in that set. |
When the ACCELERATION command is not present, acceleration results are not output.
Acceleration output is only available for frequency response and transient analysis solution sequences.
The form argument is only applicable for frequency response analysis. It is ignored for other analysis types.
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 the results available and their respective 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