MATV response

In the Simcenter 3D Noise and Vibration environment, you can use the Modal Acoustic Transfer (MATV) Response solution to compute vibro-acoustic responses of a model that contains both an ATV Set (from a FEM or BEM analysis) and a Mode Set, fluid-structure coupling definition, and Modal Participation Factors (MPFs). An ATV Set replaces a component or assembly FEM file that contains an acoustic domain mesh, but a Mode Set replaces a component or assembly FEM file that contains structural modes.

The MATV response solution can efficiently compute vibro-acoustic pressure, structural modal contributions, MATV contributions, and other quantities in the context of one-way (weak) coupled interior or exterior vibro-acoustic problems.

Note:

MATV contribution results depend on several factors, especially fluid-structure coupling values and structural modes.

You can use MPFs directly from structural solutions that may contain frequency, order, or RPM data stored in a file in Nastran (.op2 or .pch) or Simcenter 3D HDF5 (.sc_h5) results files. However, MPFs in time domain from, for example, Simcenter 3D Motion must be first converted to frequency domain data or waterfall of time data by using the Model and Loads Pre-processing solution process.

Additionally, you can define forcing frequencies and a solution frequency range for the MATV response.

You use the MATV Vibro-Acoustic Output Requests modeling object to specify the types of results to recover from the MATV response solution, such as acoustic pressure, structural modal contributions, or modal participation factors, and post-process them using the Scenario Based Data-Visualization Navigator.

You can also output the following quantities and post-process them:

• MATVs

• Acoustic pressure

• Acoustic intensity

• Panel contributions

• Modal contributions

You use this method, for example, to compute vibro-acoustic pressure in an automotive cabin that is excited by external loading, and when you are certain that the acoustic effects of the fluid on the structure are negligible.

Where do I find it?

Creating Simcenter 3D Noise and Vibration Simulation files

Application	Pre/Post
Prerequisites	An assembly FEM file as the work part and displayed part, a FEM or BEM file represented as an ATV Set, and FEM file represented as a Mode Set
Command Finder	New Simulation
Simulation Navigator	Right-click the assembly FEM file→New Simulation
Menu	File→Utilities→New Simulation

Creating Modal Acoustic Transfer Vector (MATV) Response solutions

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, an assembly FEM file, a BEM or FEM file represented as an ATV Set, and FEM file represented as a Mode SetSimcenter 3D Noise and Vibration as the specified solverVibro-Acoustic as the specified analysis typeModal Acoustic Transfer Vector (MATV) Response as the specified solution type
Command Finder	Solution
Simulation Navigator	Right-click the Simulation file→New Solution

Creating MATV Vibro-Acoustic Output Requests

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, an assembly FEM file, a BEM or FEM file represented as an ATV Set, and FEM file represented as a Mode SetSimcenter 3D Noise and Vibration as the specified solverVibro-Acoustic as the specified analysis typeModal Acoustic Transfer Vector (MATV) Response as the specified solution type
Command Finder	Modeling Objects
Simulation Navigator	Right-click the Modeling Objects node→Modeling Objects
Location in dialog box	Type list→MATV Vibro-Acoustic Output Requests

Specifying coupling definition

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, an assembly FEM file, a BEM or FEM file represented as an ATV Set, and FEM file represented as a Mode SetSimcenter 3D Noise and Vibration as the specified solverVibro-Acoustic as the specified analysis typeModal Acoustic Transfer Vector (MATV) Response as the specified solution type
Command Finder	Modeling Objects
Simulation Navigator	Right-click the Modeling Objects node→Modeling Objects
Location in dialog box	Type list→Fluid-Structure Interface Modeling Parameters

Adding Modal Participation Factors as loads

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, an assembly FEM file, a BEM or FEM file represented as an ATV Set, and FEM file represented as a Mode SetSimcenter 3D Noise and Vibration as the specified solverVibro-Acoustic as the specified analysis typeModal Acoustic Transfer Vector (MATV) Response as the specified solution typeNastran result file (.op2), PCH (.pch), or Simcenter HDF5 Data File (*.sc_h5) that contains modal participation factors
Command Finder	Modal Participation Factors
Simulation Navigator	Right-click Load Container→New Load→Modal Participation Factors

How do I

Replace different FEM files with an Acoustics BEM ATV set

Learn more

MATV response workflow

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Command reference

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MATV response, Simcenter 3D 2021.1 Series

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