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EKE |
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EKE |
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EKE |
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EKE |
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I/O Options and Subcase Information Entry
EKE - Output Request
Description
The EKE command can be used in the I/O Options or Subcase Information sections to request kinetic energy and kinetic energy density output for all subcases or individual subcases, respectively.
Format
EKE (format_list, type, dmig, peakoutput) = option
Argument |
Options |
Description |
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format |
<HM, H3D, 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). |
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PUNCH: |
Results are output in Nastran punch results format (.pch file). |
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OP2: |
Results are output in Nastran output2 format (.op2 file) (Comment 8). |
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PLOT: |
Results are output in Nastran output2 format (.op2 file) when PARAM, POST is defined in the bulk data section. |
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blank: |
Results are output in all active formats for which the result is available. |
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type |
<AVERAGE, AMPLITUDE, PEAK> Default = AVERAGE see Comment 7 |
AVERAGE: |
In frequency response analysis average energy is output. |
AMPLITUDE: |
In frequency response analysis the amplitude of energy is output. |
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PEAK: |
In frequency response analysis the peak energy is output. This is the sum of AVERAGE and AMPLITUDE. |
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dmig |
<DMIG, NODMIG> Default = NODMIG |
DMIG: |
Results are provided for external superelements in the .out file. |
NODMIG: |
Results are not provided for external superelements in the .out file. |
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peakoutput |
<PEAKOUT> Default = blank |
If PEAKOUT is present, only the filtered frequencies from the PEAKOUT card will be considered for this output. |
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option |
<YES, ALL, NO,NONE, SID> Default = ALL |
YES, ALL, blank: |
Element kinetic energy and kinetic energy density are output for all elements. |
NO, NONE: |
Element kinetic energy and kinetic energy density are not output. |
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SID: |
If a set ID is given, element kinetic energy and kinetic energy density are output only for elements listed in that set. |
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| 1. | When an EKE command is not present, element kinetic energy and kinetic energy density is not output. |
| 2. | Initial thermal strain is included in the calculation of kinetic energy and kinetic energy density. |
| 3. | 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. |
| 4. | Multiple instances of this card are allowed; if instances are conflicting, the last instance dominates. |
| 5. | For optimization, the frequency of output to a given format is controlled by the I/O option OUTPUT. |
| 6. | Type only applies to frequency response analysis. |
| 7. | The three ways to calculate the Element Kinetic Energy in Frequency Response Analysis are listed as follows: |
Type of Output |
Formula |
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Average |
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Amplitude |
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Peak |
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Where,
E is the corresponding Element Energy
is the real part of Displacement
is the imaginary part of Displacement
is the Element Mass matrix
| 8. | format=OUTPUT2 can also be used to request results to be output in the Nastran output2 format (.op2 file). |
See Also:
