HyperWorks 12.0 Release Notes

Sets of RIGID Elements Can Now be Specified with the Bulk Data SET Data
The set TYPE can now be specified as RIGID in the Bulk Data SET data. This is required when
specifying the set of RIGID elements attached to the connection points in the PFPATH data.
New Parameters
• PARAM,FASTFR: PARAM,FASTFR is used to control the solution method for modal frequency
response analysis. The default is AUTO, but YES and NO can be used to turn on or off the new fast
solution method.
• PARAM,AGGPCH: Setting AGGPCH to YES causes the fluid-structure coupling (Area) matrix to be
output to the .pch file in DMIG format.
• PARAM,ERPC: Used to specify the speed of sound in the fluid. This is required to convert the ERP
value to a sound level.
• PARAM,ERPRLF: Used to specify the radiation loss factor. This is required to convert the ERP
value to a sound level.
• PARAM,ERPRHO: Used to specify the fluid density. This is required to convert the ERP value to a
sound level.
• PARAM,ERPREFDB: Used to specify the reference pressure. This is required to convert the ERP
value into decibels.
• PARAM,RHOCP: Used as a scale factor in the calculation of the ERP value in decibels.
• PARAM,GE_MOD: used to specify the structural damping GE value for all MATx and PCOMPx data.
This new value will override the value on the MATx and PCOMPx data. This new value can be set to
zero. In addition, GE_MOD can be set to NO_GE. In this case no structural damping is considered
from MATx, PCOMPx, CELAS, PELAS, and PBUSH data. PARAM,G can be used to specify structural
damping based on the entire stiffness matrix.
• PARAM,NUMEG: used to specify the estimated number of modes for modal Frequency Response
and Transient Analysis, when the number of modes is not specified on the EIGRL/EIGRA data. This
number of modes is used to estimate the disk space usage.
• PARAM,AMSESLM: SPCD should be used for enforced motion for frequency response. If the old
Large Mass Method is used for enforced motion for modal frequency response and EIGRA is used to
calculate the modes, then PARAM,AMSESLM,1 should be specified.
• PARAM,INTRFACE: This parameter is used to turn off the generation of the .interface file. The
.interface file contains the data about the fluid-structure coupling and is created by default.
PARAM,INTRFACE,NO will turn off the generation of this file.
• PARAM,ENFMOTN: This parameter is used to control the displacement output during modal
frequency response with enforced motion. If set to ABS, the absolute displacement is output, and
if set to REL, the relative displacement to the enforced motion is output. The default is ABS.
• PARAM,AMSES: Switches eigenvalue extraction method from Lanczos to AMSES.
• PARAM,VMOPT: This parameter is used to control the method used when the mass from virtual
fluid (MFLUID) is used to model incompressible fluids.
• PARAM,ASCOUP: Setting this parameter to NO will turn off the generation of the fluid-structure
coupling (Area) matrix. This is required when this matrix is read in from the PUNCH file.
• PARAM,INTRFACE: Setting this parameter to NO will turn off the generation of the fluid-structure
coupling .interface file which is used to check the fluid-structure coupling as determined by the
ACMODL data.
• PARAM,LMSOUT: Setting this parameter to STRESS will turn on the output of the modal stresses
in addition the condensed modes and full diagonal mass matrix.