MPCFORCE

I/O Options and Subcase Information Entry The MPCFORCE command can be used in the I/O Options or Subcase Information sections to request multi-point force of constraint vector is output for all subcases or individual subcases, respectively.

Format

MPCFORCE (sorting, format, form_list, peakoutput, modal) = option

Definitions

Argument Options Description
sorting <SORT1, SORT2> 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. 5
blank (Default)
For Frequency Response Analysis, if grid SET is not specified, SORT1 is used, otherwise, SORT2 is used; for Transient Analysis, SORT2 is used.
format <OPTI, PUNCH, OP2, PLOT, blank>
OPTI
Results are output in OptiStruct results format (.mpcf file).
PUNCH
Results are output in Nastran punch results format (.pch file).
OP2
Results are output in Nastran output2 format (.op2 file).6
PLOT
Results are output in Nastran output2 format (.op2 file) when PARAM,POST is defined in the Bulk Data section.
blank (Default)
Results are output in all active formats for which the result is available.
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, multi-point constraint forces of the structural modes and residual vectors are output to the PUNCH and OUTPUT2 files for Modal Frequency Response and Transient Analysis.
option <YES, ALL, NO, NONE, SID>

Default = ALL
YES, ALL, blank
Multi-point force of constraint vector is output for all grids.
NO, NONE
Multi-point force of constraint vector is not output.
SID
If a set ID is given, multi-point force of constraint vector is output only for grids listed in that set.

Comments

  1. When an MPCFORCE command is not present, multi-point force of constraint vector is not output.
  2. 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.
  3. Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates.
  4. For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT.
  5. 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.
  6. format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file).
  7. MPCFORCE output is available for the following solution sequences:
    Solution Sequence
    Output Formats
    Static Analysis
    H3D, OP2, PCH, OPTI
    Normal Modes Analysis
    H3D, OP2, PCH
    Direct Frequency Response Analysis
    OP2, PCH
    Modal Frequency Response Analysis
    OP2, PCH
    Direct Transient Response Analysis
    OP2, PCH
    Modal Transient Response Analysis
    OP2, PCH
    Nonlinear Transient Response Analysis
    H3D
    Response Spectrum Analysis
    H3D, PCH
    Explicit Dynamics (Radioss Integration)
    H3D, OP2, PCH