Simcenter 3D Noise and Vibration environment

With the Simcenter 3D Noise and Vibration environment, you can:

• Create a model that contains:Only the alternate representations ATV Set and Mode Set. The ATV Set represents the acoustic fluid and the Mode Set represents the structure.Enforced motion loads (Modal Participation Factors (MPFs) or structural vibrations) and an ATV Set.Enforced acoustic pressures and an ATV Set.Forcing frequencies.

• Export the model, and let the pre-solver (which is also used by the Model and Load Pre-processing solution process) compute acoustic results in the context of coupled interior or exterior vibro-acoustic problems. Also, you can post-process the results using scenario-based post-processing.

• Solve multiple subcases for an order-cut analysis with multiple RPMs.

Supported solution types

This environment supports the following solution types:

Solution type	Description
Modal Acoustic Transfer Vector (MATV) Response	Lets you compute vibro-acoustic responses of a model that contains both an ATV Set (from a FEM or BEM analysis) and a Mode Set, coupling definition, and Modal Participation Factors (MPFs).
Acoustic Transfer Vector (ATV) Response	Lets you compute vibro-acoustic responses of a model that contains both an ATV Set (from a FEM or BEM analysis) and enforced motions (displacements, velocities, or accelerations) in frequency domain from an external file.
Inverse Numerical Acoustics	Lets you estimate component vibrations of a model that contains both an ATV Set (from a FEM or BEM analysis) and measured or computed acoustic pressures from an external file. Optionally, the model can contain manually specified vibrations or measured vibrations from an external file.

Supported loads

This environment supports:

• The Modal and Participation Factors (MPFs) load. You can use MPFs directly from structural solutions that may contain frequency, order, or RPM data stored in a file in Nastran OP2, PCH, or HDF5 format. 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.

• Enforced vibrations (displacements, velocities, or accelerations) in the frequency domain from an external file.

• Acoustic pressures from an external file.

Supported constraints

The Inverse Numerical Acoustics solution type supports the following:

• Manual definition of velocities on selected nodes of an acoustic fluid mesh using the Enforced Velocity Constraint command. Typically, the acoustic fluid mesh represents the skin that is coupled with the structural radiating surface.

• Automatic definition of velocities on nodes of an acoustic fluid mesh by using an external, input file using the Enforced Velocity Constraint from External File command. When you use either the manual or automatic definition to place measured vibrations on strategic nodes, the accuracy of the calculated input vibrations may increase.

Note:

When you specify 0 for the velocity values, the software constraints all nodal DOFs.

Supported simulation objects

For all solution types except for Inverse Numerical Acoustics, this environment supports the definition of structural panels. A Panel contains structural elements. You can use a Panel to compute contributions of structural panels to acoustic pressure results. You use the Panel dialog box to specify panels.

Supported modeling objects

Depending on the active solution, this environment supports the following modeling objects:

• Fluid-Structure Interface Modeling Parameters to define the interface between the structure and the fluid.

• Forcing Frequencies.

• ATV Vibro-Acoustic Output Requests, MATV Vibro-Acoustic Output Requests, and Inverse Numerical Acoustics Output Requests.

• Regularization to define the regularization method.Note: When you first solve a solution using the Adaptive Pruning Method (automatic regularization method) and you then want to define regularization values derived from the automatically calculated values for a subsequent solution, you do the following:Use the pre-configured Inverse Numerical Acoustics (L-Curve) post-processing scenario to plot both the residual norms and tolerance values of the L-curve stacked in one view.Note: For more information, see Inverse Numerical Acoustics (L-Curve) scenario.To visualize the help lines, right-click the blank area between the two plots and choose Probing Mode→SingleX.Drag the help line to the left or right to an area where a steep negative slope transitions to a gradual (less steep) negative slope.To extract the tolerance values at each forcing frequency, use the Select Value for Regularization probing mode option .Because the software stores the extracted tolerance values in a field, you can then reference the field in a new or modified Regularization modeling object of a subsequent solution.For more information, see Extract L-curve regularization values.

Post-processing of results

You use the modeling object:

• ATV Vibro-Acoustic Output Requests to specify the types of results to recover from the ATV response solution: acoustic pressure, acoustic power, acoustic intensity, panel contributions to acoustic power or intensity, equivalent radiated power, or element equivalent radiated power, and post-process them using the Scenario Based Data-Visualization Navigator.

• MATV Vibro-Acoustic Output Requests to specify the types of results to recover from the MATV response solution: acoustic pressure, acoustic power, acoustic intensity, MPFs, or structural panel and modal contributions including contributions to acoustic power or intensity, and post-process them using the Scenario Based Data-Visualization Navigator.

• Inverse Numerical Acoustics Output Requests to specify the particle velocity results to recover from the inverse numerical acoustic solution, and post-process them using the Scenario Based Data-Visualization Navigator.

You can also output the regularizations, such as L-Curve - Order Cut and L-Curve (Tolerance) - Order Cut and post-process them.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter 3D Noise and Vibration as the specified solver
Command Finder	Solution
Simulation Navigator	Right-click the Simulation file→New Solution

Learn more

Remote solving workflow (Linux)

Quick links

Command reference

Pre/Post video examples

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Simcenter 3D Noise and Vibration environment, Simcenter 3D 2021.1 Series

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