MATV response workflow

To use ATV and mode sets in a simulation, you replace a component FEM or assembly FEM with an ATV Set and another component FEM or assembly FEM with a Mode Set. You can then use these alternate representations with a fluid-structure interface (coupling) definition and Modal Participation Factors (MPFs) load in a Modal Acoustic Transfer Vector (MATV) Response solution to generate a vibro-acoustic response.

Note:

For a workflow that:

• Creates an ATV Set in the Simcenter Nastran environment, see ATV set workflow.

• Creates an ATV Set in the Acoustics BEM environment, see ATV set workflow (Acoustics BEM).

• Creates a Mode Set, see Generating modal model results for a mode set.

• Transforms Motion MPFs to frequency-dependent acoustic loads, see Motion MPF transform workflow for vibro-acoustic loading.

Note:

If you want to compute the response for a new ATV Set or Mode Set that, for example, contain different results, you reference the new ATV Set or Mode Set in the FE Model Component Representation dialog box or external file in the Acoustic Transfer Vector Set respectively Mode Setdialog box.

Step	Summary	Detailed help topic
1.	Open a Simulation file.	Open an existing Simulation file that contains a component FEM or assembly FEM file.The Simulation file can be the same one that was used for computing the ATV Set or Mode Set.	Simulation fileCreate a new Simulation file
2.	Replace the FEM component or assembly FEM with the ATV Set by editing the FEM representation.	Right-click the component FEM or assembly FEM that you will use as an ATV set and choose Edit Representation.	Replace different FEM files with an ATV set or VATV setReplace different FEM files with an Acoustics BEM ATV set
3.	Replace the FEM component or assembly FEM with the Mode Set by editing the FEM representation.	Right-click the component FEM or assembly FEM that you will use as a mode set and choose Edit Representation.	Replace a FEM file with a mode set or FRF set
4.	Create a new solution.	Set the Solver to Simcenter 3D Noise and Vibration, the Analysis Type to Vibro-Acoustic, the Solution Type to Modal Acoustic Transfer Vector (MATV) Response and create a Subcase - Modal Participation Factors.	Solutions and solving
5.	Define forcing frequencies.	Add Forcing Frequencies to the solution or solution subcases to excite the model.	Specifying forcing frequencies for a frequency response analysis
6.	Create output requests.	Request the desired output, such as acoustic pressure, panel contributions to acoustic power, and so on with the MATV Vibro-Acoustic Output Requests modeling object.	Requesting output for Noise and Vibration analyses
7.	Define the vibro-acoustic solution parameters.	Create a Fluid-Structure Interface Modeling Parameters modeling object, where you can specify parameters that control the fluid-structure interface (coupling) for the analysis.	Define fluid-structure interface modeling parameters (Noise and Vibration)
8.	Create loads.	Reference an external file, such as a Nastran (.op2), PCH (.pch), or Simcenter HDF5 Data File (*.sc_h5), that may contain MPFs.Note: MPFs in time domain must be first converted to frequency domain data or waterfall of time data with the Model and Load Pre-processing solution process.	Modal Participation Factors dialog boxMotion MPF transform workflow for vibro-acoustic loading
9.	Solve the model.	Solve the model to generate the MATV response results.During this step, the pre-solver used by Simcenter 3D Noise and Vibration writes the results to a simulation_file_name-solution_name.sc_h5 file.	Solve the model
10.	Post-process the results.	Select the vibro-acoustic results and choose Post-processing Scenario.	Scenario-based post-processing

How do I

Replace different FEM files with an Acoustics BEM ATV set

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MATV response

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MATV response workflow, Simcenter 3D 2021.1 Series

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