Transfer Path Analysis

1.	From the NVH-Utilities tab, click the Transfer path analysis icon, .

2.	From the Load sub-tab, in the Transfer function field, select an OptiStruct .PCH or .h3d file, or Nastran .PCH file where Transfer Function output is available.

3.	In the Force field, select an OptiStruct .PCH or .h3d file, or Nastran .PCH file where Force output is available.

4.	Click Load.

Option	Description
File selection	From the Load tab, under File selection, you can select the following file types:
	Configuration	Select a previously saved .csv file and click Load. Upon reading the file, the Path Identification fields are populated.
	Transfer Function	Select an OptiStruct .PCH or .h3d file, or Nastran .PCH file, or test .UNV file, where Transfer Function output is available.
	Force	Select an OptiStruct .PCH or .h3d file, or Nastran .PCH file, or test .UNV file, where Force output is available, then click Load.

Load tab/Path sub-tab

After you've loaded a file, the Load tab > Path sub-tab is populated. Click Path Details to view transfer path details, or Apply to confirm the path detail configuration and move to the Load tab > Subcase sub-tab. Control volume is an advanced functionality that will be implemented in a future release.

tpa_load_path

NVH-Utilities Browser – Load > Path sub-tab (Transfer Path Analysis)

If the Transfer function field is filled, but the Force field is left blank, you will be asked to confirm if you intend to proceed with the TPA analysis with assumed forces.

tpa_question_dialog

If you click Yes, you are presented with a dialog where you can either accept the default unit forces, or enter another scalar (target) value, which will be used to generate a assume force file for use in the TPA analysis.

tpa_assumed_force_data

Assumed Force Data dialog

Load tab/Subcase sub-tab

tpa_load_subcase

NVH-Utilities Browser – Load > Subcase sub-tab (Transfer Path Analysis)

Subcase identification

Identifies the Subcase type and subcase ID to RPM or principal component relationship.

If subcase is General, simply select a subcase and click Apply to move to the Load > Response sub-tab.

If subcase is Spindle Loads - Selected subcases are interpreted as subcases related to principal components to be used as spindle input for TPA analysis.

If subcase is Engine Loads - Selected subcases are interpreted as subcases related to input at various RPMs to be used for TPA analysis.

Load tab > Response sub-tab

tpa_load_response

NVH-Utilities Browser – Load > Response sub-tab (Transfer Path Analysis)

Option	Description
Result selection	The following fields are available under Result selection.
	Subcase	Select an analysis subcase.
	Result type	Select one of the available result types.
	Response ID	Grid ID of the response for which Modal/Panel participation results are available. Select a response ID from the list.
	Response label (optional)	Enter a label that describes the response, for example "Driver’s Ear".
	Direction component	X, Y, or Z.
Contribution analysis	The following fields are available under Contribution analysis. Once the result selection options are complete, select Load Response to further investigate the contributions.
	Sum paths by	Select how contributions from various paths are to be summed.
	Sum subcases by	Select how contributions from subcases are to be summed.
Generate all path contribution plots	When checked, contribution plots of all paths are generated with three paths on each page.
Display Options	The Display Options dialog allows you to customize the response plot, including scale, weighting, and the plot layout.
Load Response	Once the result selection options are complete, select Load Response to display the file data.

tpa_path_cont_plots

NVH-Utilities Browser – Path contribution plots (Transfer Path Analysis)

Transfer Path Analysis - Load Tab

Transfer Path Analysis - Load Tab

Transfer Path Analysis - Load Tab

Configuration

Transfer Function

Force

Load tab/Path sub-tab

Load tab/Subcase sub-tab

Subcase identification

Load tab > Response sub-tab

See Also: