Analyzing vibro-acoustic contribution data

After solving a Simcenter Nastran vibro-acoustic model, you can analyze the panel contribution data and modal contribution data using the XY Function Navigator.

You can plot the result curves for a particular subcase, type, or degree of freedom for all contribution data.

Analyzing contribution data

You can request the following types of contribution results in the Nastran solution.

Panel Contributions

Panel contribution curves express the contribution of a given vibrating structural panel (the sum of all its nodes) to the pressure response at a given acoustic node. Panels must be part of the fluid structure interface. You can request this contribution using the Panel Contribution output request for the solution by specifying the Panels for Contributions option.

Structural Mode Contributions

Structural mode contributions express the contribution of a given structural mode to the response at a given node and degree of freedom. You can request this contribution using the Modal Contribution output request for the solution by selecting the Structural Modes for Contributions option.

Acoustic Mode Contributions

Acoustic mode contributions express the contribution of a given acoustic mode to the response at a given node and degree of freedom. You can request this contribution using the Modal Contribution output request for the solution by selecting the Fluid Modes for Contributions option.

The modal data required to analyze the vibro-acoustic modal contribution is contained in the OP2 file, which is the output of the Simcenter Nastran solution.

XY plotting OP2 SORT2 results

You can analyze the Simcenter Nastran SORT2 results using the XY Function Navigator. The results are grouped by response node, response type, degree of freedom, and subcase.

Where do I find it?

Application	Pre/Post
Prerequisites	Simcenter Nastran as the specified solver.A loaded Nastran OP2 SORT2 results file in the XY Function Navigator.
XY Function Navigator	Right-click the Nastran OP2 Files- Sort2 Results→Open or Open Directory
Graphics window	Right-click the desired contribution curve and click XY Plot.

How do I

Create a panel

Automatically create panels

Define grid contribution parameters

Define modal contribution parameters

Define panel contribution parameters

Plot vibro-acoustic contribution data

Quick links

Command reference

Pre/Post video examples

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Analyzing vibro-acoustic contribution data, Simcenter 3D 2021.1 Series

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