GPFORCE

I/O Options and Subcase Information Entry

GPFORCE - Output Request

Description

The GPFORCE command can be used in the I/O Options or Subcase Information sections to request grid point force balance output for all subcases or individual subcases, respectively.

Format

GPFORCE (format_list, elem, form, peakoutput, modal, use) = option

Argument	Options	Description
format	<H3D, OPTI, PUNCH, OP2, PLOT, blank> Default = blank	H3D:	Results are output in Hyper3D format (.h3d file).
		OPTI:	Results are output in OptiStruct results format (.gpf file).
		PUNCH:	Results are output in Nastran punch results format (.pch file).
		OP2:	Results are output in Nastran output2 format (.op2 file) (Comment 9).
		PLOT:	Results are output in Nastran output2 format (.op2 file) when PARAM, POST is defined in the bulk data section.

elem (H3D only)	<ELEM, NOELEM> Default = NOELEM	NOELEM:	GPFORCE results in the H3D output file will not include element contributions. However, the TOTAL value for each GRID includes the element contributions.
		ELEM:	GPFORCE results in the H3D output file includes element contributions.

form	<REAL, IMAG, PHASE> Default = REAL	REAL, IMAG:	Provides rectangular format (real and imaginary) of complex output.
		PHASE:	Provides polar format (phase and magnitude) of complex output.

peakoutput	<PEAKOUT> Default = blank	If PEAKOUT is present, only the filtered frequencies from the PEAKOUT card will be considered for this output.

modal	<MODAL> Default = blank	If MODAL is present, grid point forces of the structural modes and residual vectors are output to the PUNCH and OUTPUT2 files for modal frequency response and transient analysis.

use	<FBD> Default = blank	If FBD is present, all the necessary output (SPCFORCE, MPCFORCE, and OLOAD) required for FBD will be triggered automatically.

option	<YES, ALL, NO,NONE, SID> Default = ALL	YES, ALL, blank:	Grid point force balance is output for all elements.
		NO, NONE:	Grid point force balance is not output.
		SID:	If a set ID is given, grid point force balance is output only for nodes listed in that set.

Comments

1.	When a GPFORCE command is not present, grid point force balance is not output.

2.	GPFORCE output is available for the following solution sequences:

Solution Sequences	Output Formats
Static Analysis	H3D, OP2, PCH, OPT
Normal Modes Analysis	H3D, OP2, PCH
Direct Frequency Response Analysis	H3D, OP2, PCH, OPT
Modal Frequency Response Analysis	H3D, OP2, PCH, OPT

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

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.

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

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

7.	GPFORCE in .op2 output can only be post-processed with the Free Body Diagram (FBD) tools in HyperMesh/HyperView.

8.	GPFORCE in .h3d output can be used for the load transfer path analysis with NVDirector. It is only available for linear static, frequency response, and acoustic analyses. H3D file written with GPFORCE with “use=FBD” (i.e. GPFORCE(FBD)) can be used for FBD in HyperView.

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

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Comments