HyperView User's Guide

Grid Participation - Load Tab

Grid Participation - Load Tab

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Grid Participation - Load Tab

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From the NVH-Utilities tab > Grid Participation > Load sub-tab, select the file(s) and result options that you want to plot grid participation data for.

nvh_grid_partcptn_load_tab_ex1_hv

NVH-Utilities Browser - Grid Participation - Load tab

File selection

Use the following file browsers to select the file(s) that you would like to load.

Result

Select the result file using the file browser (.h3d, .pch, .res, or .op2).

Note:A PCH file cannot be read directly into HyperView, therefore it has to be converted into the RES format.  The translation process includes running a special version of HMNast to convert the PCH file into the RES file, which is then used for plotting.

Cavity

Select the model file which contains the solid elements for the cavity (.fem, .dat, or .bdf).

*This file is not required if an OptiStruct .h3d or MSC Nastran .op2 file is loaded into the Result file field.

Structure

Select the model file which contains the solid elements for the structure (.fem, .dat, or .bdf).

*This file is not required if an OptiStruct .h3d or MSC Nastran .op2 file is loaded into the Result file field.

Interface

Select the model file which contains the elements
on the interface of the cavity and structure interaction
(.interface).

*This file is not required if an OptiStruct .h3d or MSC Nastran .op2 file is loaded into the Result file field.

Load

Click Load to load the files designated in the File selection section of the tab.  Upon reading the file, the Result selection fields are populated (see below).

Result selection

The following fields are available under Result selection.  Once the result selection options are complete, select Load Response to further investigate the participations.

H3D output

The H3D output option.

Contour = Yes - means that the grid participation results have been output in a format that is ready for contouring (which reduces the amount of processing required for HyperView).

Contour = No - means that the grid participation results have been output in a raw, unprocessed format.


Subcase

Displays the various subcases and their scale types available for selection from the drop-down menu - (s) indicates a scalar-type result, (c) indicates complex results, (t) indicates a tensor-type result, and (v) indicates a vector-type result.

Note:There is a Fluid Grid ID raw data result type generated by OptiStruct which can also be viewed by using the various options in the Contour panel.

Response ID

Grid ID of the response for which Grid participation results are available.  Select one from the drop-down menu.

Response label
(optional)

Enter a label that describes the response, for example
"Driver’s Ear".


Result set

Select either a Structure Grid Participation plot or a Fluid Grid Participation plot.

Display Options

Customize the response plot, including scale, weighting, and the plot layout.

Load Response

Apply the grid participation plot in the graphics area (see the example below).

The response study is meant to accomplish two goals:

1.Find the upper limit of the selected nodes’ impact on the response.  If it is too small, you may decide not to bother with optimizing the local structure there.
2.Identify the impact of the selected nodes over the entire frequency range analyzed.  This is beneficial because it is often the case in solving NVH problems that improvement in one frequency is accompanied by degradations at others.  Therefore, knowing the impact over the whole frequency ranges helps you to ensure that the solution created by modifying the structure at the selected nodes is a good overall solution.

See the HyperGraph User's Guide for additional information on plotting.

respnse_study_exmple

An example of a response study