EKE
I/O Options and Subcase Information Entry 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, group, SUBSYS=SUBSYS_ID) = option
Definitions
Argument | Options | Description |
---|---|---|
format | <HM, H3D, PUNCH, OP2, PLOT, blank> |
|
type | <AVERAGE, AMPLITUDE, PEAK> |
|
dmig | <DMIG, NODMIG> |
|
peakoutput | <PEAKOUT> Default = blank |
If PEAKOUT is present, only the filtered frequencies from the PEAKOUT card will be considered for this output. |
group | <PROP,
COMP, SET,
OPROP, OCOMP,
OSET> Default = blank |
|
SUBSYS | <SUBSYS_ID> No default |
ID of the subsystem. When used along a subsystem definition, this option generates an individual result file for each subsystem with results for that subsystem only. For more information, refer to the SET Bulk Data Entry. |
option | <YES, ALL,
NO, NONE,
SID> Default = ALL |
|
Comments
- When an EKE command is not present, element kinetic energy and kinetic energy density is not output.
- Initial thermal strain is included in the calculation of kinetic energy and kinetic energy density.
- 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.
- 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.
- type only applies to Frequency Response Analysis.
- The three ways to calculate the element kinetic energy
in Frequency Response Analysis are:
- Output Type
- Formula
- Average
- Amplitude
- Peak
Where,- Corresponding Element Energy
- Real part of Displacement
- Imaginary part of Displacement
- Element Mass Matrix
- The group argument is supported only for
Static, Eigenvalue, Frequency Response, Transient Analysis and Aeroelastic
Divergence Analysis with H3D and PUNCH formats.
- In the H3D file, group kinetic energy and group kinetic energy density are available under the element kinetic energy results type.
- In the PUNCH file, the Property/Component ID’s and the corresponding kinetic energy and kinetic energy density are available.
If SET/OSET is requested, a SID of Boolean set with operator OR is expected in the field option. Element SETs referenced when using this option should have the OPERATOR field set to OR. Regular element sets without Boolean OR are not allowed. SET/OSET is currently only supported for H3D and PUNCH formats.
- Rotor energy output for Direct/Modal Complex Eigenvalue Analysis (with ASYNC, SYNC, and multiple rotors) is available in the <filename>.rengy file when ESE or EKE output requests are present in the model. The output printed to the .rengy file is calculated as a percentage of the ratio of rotor energy to the requested energy output of elements. It is recommended that you request energy output for ALL elements so that the rotor energy percentage printed in the .rengy file is meaningful.