HyperView User's Guide

Model Correlation - Load Tab

Model Correlation - Load Tab

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Model Correlation - Load Tab

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From the Model Correlation utility's Load tab, you can select and load the reference and correlation files and define the model files to prepare them for a MAC analysis.

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Model Correlation Utility - Load tab - Transformation sub-tab

File selection

Click the file browser icon for the Reference File and Correlation File fields and select one of the file types listed below.  Upon selection, click Load.

H3D (*.h3d)

OP2 (*.op2)

UNV (*.unv)

ODB (*.odb)

Transformation

The first step in performing a MAC analysis is to ensure that both the geometry of the finite element model and the associated results are transformed into an overplayed position in a common coordinate system.

This can be done using the transformation capability, found in the Transformation tab:

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Transformation tab

1.Under Reference node Selection, select three nodes from the reference model.
oClick the node selector (N1, N2, N3) to activate it, then select the node on the model in the graphics area.
oYou can also double-click on a node selector to enter a node ID directly into the Select by ID dialog.

select_nodes_by_id_dialog

2.Under Correlation node Selection, select three corresponding nodes from the correlation model, which will serve as the destination locations for the nodes selected in step 1.
3.Click Transform to correlate the two models using scaling and positioning.

The entire reference model is transformed as a rigid body based on the transformation defined by the three nodes in step 2.

4.Results associated with the reference model are transformed in the same way as in step 3.
5.Click Save Model to save the transformed model.

NodePairs

The next step is to identify the node pairs between the reference and correlation models.

Use the NodePairs tab to filter nodes with different options.

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NodePairs tab

 

Selection by

Submodels can be defined based on finite element (FE) components, user-defined node sets, or a HyperWorks assembly module structure (requires a module ID file).

From the Selection by drop-down menu, select Component, Set, or Assembly.

 

Reference and Correlation Filters

Click the filter icon, filter_icon, for the Reference or Correlation Filters to filter components to a smaller set of data.

You can show or hide components by moving them to the appropriate column.

hide comps - A list of components that will be hidden in the display.  You can move the components from the hide comps list to the show comps list.  To do this, select one or more components from the list and click the linear_superposition_right_arrow arrow to move it to the show comps column.

show comps - The components used for the node pairs.  You can move the paths in the show comps list back to the hide comps list to reduce the list of components.  You can move the modes from the show comps list to the hide comps list to reduce the list of components.  To do this, select one or more components from the list and click the linear_superposition_left_arrow arrow to move it to the hide comps column.

•Click select_all_icon to select the entire list of components.
•Click selectnone to deselect your current selections.
•Click reverse_selection_icon exchange the currently selected components for the unselected components in the list.

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Filter Comps dialog

 

Element Selection

Select Mass and/or Plotel and enter a length filter to identify element configurations.

You can also select 1D, 2D, and 3D elements by activating those check boxes.

 

Node Pair

Node pair preference is given to nodes with identical IDs, or low-to-low and high-to-high IDs.

 

 

Tolerance

You can filter nodes in the models based on a user-specified distance tolerance. Enter a node pair tolerance value in the Tolerance field.

 

 

Show

Use the Show drop-down menu to display either Mapped Pair or Unmapped Nodes in the 3D graphics window.  Nodes in the reference model are mapped with those in the correlation model.

 

 

Import/Export
•Click Import nvh_model_correlation_load_node_pair_tab_import_icon to import a .csv file containing node pairs.

OR

•Click Export nvh_model_correlation_load_node_pair_tab_export_icon to export node pairs into a .csv file.

 

 

Scan

Click Scan to scan the model files for the filters you have defined.

 

Save

Click Save to save the node pairs you have identified.

 

Apply

Once the node pairs between the reference and correlation models are finalized, click Apply. The utility automatically goes to the ModesFilter tab.

ModesFilter

Using the ModesFilter tab, you can select modes from the two models based on the load cases, defining a frequency range, or by filtering the frequency values manually.

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ModesFilter tab

 

Ref and Cor Subcase

Use the Ref Subcase and Cor Subcase drop-down menus to select loadcases for filtering.

 

Start and End Frequency

Enter a start and end frequency range and click Select to filter the modes in that range.

 

Reference and Correlation Mode List Columns

Modes can be individually filtered using the filter icon, filter_icon.  Clicking the filter icon displays the Filter Modes dialog.

You can show or hide modes by moving them to the appropriate column.

hide modes - A list of modes that will be hidden from view.  You can move the modes from the hide modes list to the show modes list.  To do this, select one or more modes from the list and click the linear_superposition_right_arrow arrow to move it to the show modes column.

show modes - The modes to be displayed. You can move the modes from the show modes list to the hide modes list to reduce the list of modes.  To do this, select one or more modes from the list and click the linear_superposition_left_arrow arrow to move it to the hide modes column.

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Filter Modes dialog

You can also use the following icons to the right of the mode list columns and in the Filter Modes dialog.

•Click select_all_icon to select the entire list of modes.
•Click selectnone to deselect your current selections.
•Click reverse_selection_icon exchange the currently selected modes for the unselected modes in the list.

 

Animate

To animate a mode, highlight only the mode from the list and click Animate.

 

Compute Submodel MAC

MAC

To see how the submodels are correlating, select Compute Submodel MAC in the lower-left corner of the tab, then click MAC to calculate the Modal Assurance Criterion (MAC).

Once the MAC calculation is complete, the utility goes to the Display tab.