VATV Sets

The Vibro-acoustic transfer vectors (VATVs) let you efficiently compute vibro-acoustic pressure due to aerodynamic or acoustic loads on flexible structures in the context of two-way (strong) coupled vibro-acoustic problems. VATVs contain matrices that link the normal force on a structural node of a flexible structure with the acoustic pressure on a microphone node. The VATVs are independent of the loading and you can reuse them for various loads in multiple vibro-acoustic solutions as long the structure, acoustic fluid, and the microphone positions remain the same.

To create a VATV response, the solver computes pressures at specified microphones for the frequencies that you select.

VATV responses above or below the vibro-acoustic excitation frequency range are not extrapolated or computed.

(1) Acoustically radiating structure, (2) Microphone, (3) Vibro-Acoustic Transfer Vector between structural nodes and microphone node

Note:

For clarity, the interior acoustic mesh of the automobile is not shown in this image.

To use a VATV in your vibro-acoustic analysis, do the following:

1. Request the software to compute the VATV using a SOL 108 Vibro-Acoustic Transfer Vector or SOL 111 Vibro-Acoustic Transfer Vector solution.

2. In a FEM or assembly FEM file, change the structural, fluid, and microphone meshes to a VATV set.

3. Use the computed VATV matrices in a SOL 108 Vibro-Acoustic Transfer Vector Response solution with either a deterministic solution step (for example, frequency response), where the same input always produces the same output, or a stochastic solution step (for example, random).

Where do I find it?

Creating VATV solutions

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, and a FEM or assembly FEM file that contains acoustic fluid, structural, and microphone meshesSimcenter Nastran as the specified solverVibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Vibro-Acoustic Transfer Vector****SOL 111 Vibro-Acoustic Transfer Vector
Command Finder	Solution
Simulation Navigator	Right-click the Simulation file→New Solution

Creating a VATV set

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, and a FEM or assembly FEM file that contains acoustic fluid, structural, and microphone meshesSimcenter Nastran as the specified solverA solved SOL 108 Vibro-Acoustic Transfer Vector or SOL 111 Vibro-Acoustic Transfer Vector solution
Command Finder	VATV Set

Replacing FEM component with VATV set

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, and a FEM or assembly FEM file that contains acoustic fluid, structural, and microphone meshesSimcenter Nastran as the specified solverVibro-Acoustic as the specified analysis typeOne of the following as the specified solution type:SOL 108 Vibro-Acoustic Transfer Vector****SOL 111 Vibro-Acoustic Transfer Vector
Simulation Navigator	Right-click the FEM or assembly FEM file→Edit Representation→VATV Set→select a VATV set from the Vibro-Acoustic Transfer Vector Set list

Creating VATV Response solution

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed part, and a VATV representation of the FEM or assembly FEM file that contains acoustic fluid, structural, and microphone meshesSimcenter Nastran as the specified solverVibro-Acoustic as the specified analysis typeSOL 108 Vibro-Acoustic Transfer Vector Response as the specified solution type
Command Finder	Solution
Simulation Navigator	Right-click the Simulation file→New Solution

How do I

Replace different FEM files with an ATV set or VATV set

Learn more

VATV set workflow

VATV set in a vibro-acoustic solution workflow

Plot mode, ATV, or VATV set contours

Quick links

Command reference

Pre/Post video examples

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VATV Sets, Simcenter 3D 2021.1 Series

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