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Vibroacoustic Design

OOFELIE::Vibroacoustic provides you with unique capabilities to analyze vibro-acoustic phenomena for applications going from large scale sonar to the latest surround sound equipment based on piezo-electrics. With OOFELIE::vibroacoustic, you are getting the core of the physics in one conveniently integrated simulation package.

Vibroacoustic Design

Product highlights: Sonar plane Wave diffraction (top-left), 5.1 Sound system performance (top-right), acoustic surroundings in a car (bottom-left), muffler modelling (bottom-right)

The Advanced Vibro Acoustic Designer’s core strengths encompass:

  • Engineering standard, intuitive, time-saving design flow, giving full control through scripting, parameterization and optimization. Driven by a world leading CAD environment.
  • Faster convergence and shorter simulation times through full strong coupled simulations between all physical phenomena.
  • Efficient handling of supersized problems using coupled FEM, BEM and FMM meshing and simulation methods.

Key Features

Highlights
Design - Abilities
  • FMM
  • Modal
  • Harmonic
Applications
Publications

Highlights

Industry Standard Designflow

Intuitive Left-to-Right Design Flow

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High Accuracy and Fast Covergence Through Strongly Coupled Modal and Harmonic Analysis

Vibro Acoustic Analysis of an Electric Relay Piezoelectric Actuation of a vibrating membrane in a horn loudspeaker

Many of the advanced vibro acoustic designs exhibit strong coupling effects between the structural and the acoustic field. AVAD lets you design the response of the whole system with regards to the shape and frequencies of the acoustic modes and provides a better solution accuracy and faster convergence for strongly coupled cases. The vibroacoustic effects can be strongly coupled with Piezoelectric simulations. The piezo stack is used to actuate a vibrating membrane in a horn loudspeaker.

Our simulation engines are fine tuned for solving large highly complex 3D problems.

High Efficiency modelling and simulation of supersized problems using FEM-BEM COUPLING and FMM.

Mesh for a plane wave diffraction by a submarine (length : 37 meters) excitation frequency : 1500 Hz (< 2GB RAM, 44mins)
The acoustic media can be modeled using Finite Element Methods (FEM) or Boundary Element Methods (BEM). The coupling of both is an ideal approach when complex surfaces radiate into a large space.On top the Fast Multipole Method is used to simulate acoustic radiation/diffraction problems with large number of degrees of freedom using BEM methodology. This approach enables you to reduce memory by a factor 20, and speed up simulations by a factor 50.

Applications

Plane wave diffraction by a submarine

Due to the large dimension of the system (about 40 meters long) and the quite high frequency of the incoming plane wave, the mesh to perform such kind of analysis have to be very fine (more than 50,000 nodes on the Figure on right).

Acoustic radiation prediction of engine

An example of acoustic radiation problem using the mesh mapping capability is showed here. We have the structural CAD model (simplified real model, for confidentiality reasons, presented on Figure « Engine CAD model ») and an acoustic CAD model.

Coupled eigenmodes extraction of a water-filled tank

The coupled eigen modes of a water filled tank are extracted using OOFELIE::VibroAcoustics package. In this case, even if we are not interested in acoustic field inside the cavity, we have to take it into account since it has a strong impact on the behaviour of the global system. In this example, the mesh mapping algorithm was used since the acoustic and structural mesh are incompatible.