To manage any of the modules shown in the Assembly Browser, right-click on a module and select Edit
Representations. This opens the Edit Module tab, and the Representation sub-tab is
shown.
Managing Representations
A module representation is simply a way a module can be represented. Valid representation
types can be assigned using the Type drop-down menu and include:
CAVITY
A finite element model that contains only fluid elements.
CMS
An H3D or OP2 based component modal synthesis model.
CDS
An H3D based component dynamic stiffness model.
An option to convert test FRFs in UNV format to CDS H3D and define it as module
representation.
FE
Typical detailed finite element models.
DMIG
DMIG based model files in ASCII format.
FRF
A model containing frequency response functions.
LP
A lumped parameter model is a simplified 1D finite element model that represents
dynamic behavior a more details model.
MODAL FE
A finite element modal model that contains spring/damper/spoint/mpc elements.
PLOT FE
A finite element model that contains PLOTEL, PLOTEL3 and PLOTEL4 elements.
Figure 1.
Right-clicking the white space will give you the options to add, remove, or edit the
description of the selected representation.
A file assigned to the root representation can be optionally auto-assigned to be a Display
representation (PLOTFE type) simultaneously by checking the Assign file to Display
representation checkbox.
A representation can be auto-selected to be the Display representation by checking the Set
as Display, load and extract TagPoints checkbox. This will be followed by the file being
imported into the 3D graphics window and TagPoints defined in the file extracted.
Once all representations are defined, click the Assembly Browser tab to
review the assembly hierarchy with active Display and Analysis representations.
Define Test FRFs (UNV) as module representations
An additional option in CDS-SE allows you to read UNV files that have test FRF information
and convert them into a CDS-H3D file. This can then be assigned as module representation.
Figure 2.
Modal model review and parameter modifications
These features allow for the review of modal model parameters of reduced model
representations (both CMS-SE and Modal-FE) and modifying them. This will help you in
understanding the effect of changing these parameters on NVH responses, without
generating reduced models with necessary modifications.
The related list of features for CMS-SE are:
Validate SPOINT ids
Allows you to manage ID conflicts between SPOINT IDs of CMS-SE reduced model
and module ID ranges.
Assign damping
Assign existing damping/add component damping to existing damping in CMS-SE.
By default, existing damping while creating CMS-SE is used. There is also an
option for adding damping to existing component damping.
Modal parameters review and modification: Use the ascii option to read modal
parameters information from an .ascii file
(_dmig_dv.inc) generated during the CMS-SE solver run.
Information related to the modal is populated for review. Select Mode to modify the
parameters. This will activate the Edit fields to modify frequency and damping values.
There is also an option for the mode to be Grounded. Save and apply the changes. This
modified information is then exported to the solver deck.
Figure 3.
Figure 4. Clicking Validate SPOINT IDs Opens this Dialog
Figure 5. Clicking Assign Damping Opens this Dialog
Figure 6.
Figure 7. Clicking the icon Opens the Create/Edit
TABDMP1 Dialog
For Modal-FE, modal parameters are populated on loading the representation file. The
options for review and modifications of parameters are the same as for CMS-SE.
Figure 8.
Managing Tagpoints
A Tagpoint is a special point used in the assembly for connection, input, response and plot
purposes. It consists of a grid with a set of relevant properties, such as name, description
and dependency.
Figure 9.
Tagpoints are displayed in the 3D graphics area and can be customized via the NVH Module
Display toolbar. By default, tagpoints are indicated with a gray sphere along with the
label. Other options are available using the pull-down menu.
Figure 10.
To add a tagpoint, right-click inside the tagpoint list in the Tagpoint tab and select
Extract All to extract TagPoints from the
comments added to the 10th field of the grids in the loaded Display model.
Lock ID
Lock ID’s provide you with a means to maintain the ID’s of tagpoints without getting
renumbered by locking them. This prevents accidental renumbering of tagpoints.
Lock ID’s have a higher preference than the sub ranging utility. If ID’s are locked
for tagpoints, then sub ranging will not renumber those locked ID’s in Prepare Module
mode.
This utility can lock the ID’s of existing tagpoints using edit tagpoints or it can
lock the tag ID while creating it using the Create TagPoints utility.
Figure 11. Locking ID's of Tagpoints as and When They are Created
Figure 12. Locking ID's of Existing Tagpoints
Figure 13. Locking ID's of Tagpoints Through the Tagpoint Mapping Tool
ID Tab
Sub ranging
Sub ranging provides you with a means to reserve a range so that it is not occupied
and not referred by anybody. This is primarily needed if you want to reserve a certain
ID range for a specific use and should not be occupied by other entities.
Some customers follow a convention of reserving the first 10,000 ID’s of nodes for
connections for every include. They would like to reserve them at the start and then
allocate these ID’s to the tagpoints pertaining to respective includes, by releasing the
reserve range, when it is required.
Figure 14.
The following images show a sample file with and without sub ranging.
icon Opens the Create/Edit
TABDMP1 Dialog
