SPCFORCE

I/O Options and Subcase Information Entry

SPCFORCE - Output Request

Description

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.

Format

SPCFORCE (sorting,format_list,form,type,peakoutput) = option

Argument	Options	Description
sorting	<SORT1, SORT2> Default = blank	This argument only applies to the PUNCH format (.pch file) or the OUTPUT2 format (.op2 file) output for normal modes, frequency response, and transient subcases. It will be ignored without warning if used elsewhere.
		SORT1:	Results for each frequency/timestep are grouped together.
		SORT2:	Results for each grid/element are grouped together (Comment 9).
		blank:	For frequency response analysis, if grid SET is not specified, SORT1 is used, otherwise, SORT2 is used.

format	<HM, H3D, OPTI, PUNCH, OP2, PLOT, blank> Default = blank	HM:	Results are output in HyperMesh results format (.res file).
		H3D:	Results are output in Hyper3D format (.h3d file).
		OPTI:	Results are output in OptiStruct results format (.spcf file).
		PUNCH:	Results are output in Nastran punch results format (.pch file).
		OP2:	Results are output in Nastran output2 format (.op2 file) (Comment 10).
		PLOT:	Results are output in Nastran output2 format (.op2 file) when PARAM, POST is defined in the bulk data section.
		blank:	Results are output in all active formats for which the result is available.

form	<COMPLEX, REAL, IMAG, PHASE, BOTH> Default (HM only) = COMPLEX Default (all other formats) = REAL	COMPLEX (HM only), blank:	Provides a combined magnitude/phase form of complex output to the .res file for the HM output format.
		REAL, IMAG:	Provides rectangular format (real and imaginary) of complex output.
		PHASE:	Provides polar format (magnitude and phase) of complex output. Phase output is in degrees.
		BOTH (HM only):	Provides both polar and rectangular formats of complex output.

type	<SPARSE, ALL> Default = SPARSE	ALL:	Single-point force of constraint is output for all selected nodes.
		SPARSE:	Single-point force of constraint is output only for selected nodes with a component with a magnitude of 1.0E-10 or greater.

peakoutput	<PEAKOUT> Default = blank	Only the filtered frequencies from the PEAKOUT card will be considered for this output.

option	<YES, ALL, NO, NONE, SID> Default = ALL	YES, ALL, blank:	Single-point force of constraint is output for all nodes.
		NO, NONE:	Single-point force of constraint is not output.
		SID:	If a set ID is given, single-point force of constraint is output only for nodes listed in that set.

Comments

1.	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.

3.	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.

4.	The form argument is only applicable for frequency response analysis. It is ignored in other instances.

5.	The forms BOTH and COMPLEX do not apply to the .frf output files.

Multiple formats are allowed on the same entry; these should be comma separated. If a format is not specified, this output control applies to all formats defined by the OUTPUT command, for which the result is available. See Results Output for information on which results are available in which formats.

7.	Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.

8.	For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT.

In general, HyperView does not recognize the SORT2 format for results from the .op2 file. When results are output only in SORT2 format (<Result Keyword> (SORT2, OUTPUT2, ….)), the results are written by OptiStruct into the .op2 file in SORT2 format, but when the .op2 file is imported into HyperView, the results in SORT2 format are not recognized. Therefore, the SORT1 option is recommended for results output in OUTPUT2 format and SORT2 option is recommended for results output in PUNCH format.

10.	format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).