Large-Scale Acoustics Analysis with "ANSYS Workbench" and "WAON"

Outline

"WBtoWAON" is a specialized interface for ANSYS Workbench, which is included in the standard package of "WAON", large-scale acoustics simulation software. With this interface, you can easily export geometries and simulation results from ANSYS Workbench to WAON.

Advantages of "WBtoWAON"


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  • Direct interface for ANSYS Workbench
    The simulation process is simple, because WAON uses native data of ANSYS Workbench (meshes and the result of simulation) for acoustics simulation.
  • Highly effective for large-scale acoustic problems
    WAON is particularly effective for large-scale and high-frequency problems which you may find difficult to do with FEM tools, such as ANSYS. On a 32-bit Windows machine (memory: 2GB) , a model with 60,000 degrees of freedom (DOF) can be solved; and on a 64-bit Windows machine (memory: 8GB) , the solvable DOF is 250,000.
  • The surface structure consists of shell meshes
    WAON applies the boundary element method (FMBEM or BEM), which models only the surface of a structure with shell meshes. Therefore it requires far less elements than FEM, which models whole of the acoustic medium.

Analysis Case

Analysis Model

Sound radiation of a speaker

  • The results of Harmonic Response Analysis by ANSYS Workbench will become the Sound Source.
  • Boundary element mesh and Field point mesh are the exports from the models of ANSYS Workbench.

Boundary Conditions

  • Geometry; With thin boundary layers
  • Medium; Air (at RT)
  • Sound Source; apply the speed to the speaker cone
  • Frequency; 2000Hz

Simulation Process

  1. Model the Geometry of the speaker cone, the speaker box and the field points with 3D-CAD or ANSYS DesignModeler. Generate meshes of the above-mentioned geometries with ANSYS Workbench Simulation.

  2. Execute harmonic response analysis of the speaker cone, which is used as the sound source when doing the acoustic analysis.

  3. After the simulation, launch "WBtoWAON" from the ANSYS Workbench toolbar.

  4. Define the analysis type (acoustic / acoustic-structural coupled) , the sound source (the result of harmonic response analysis), the boundary element mesh, the field point mesh.
    WBtoWAON exports the data from ANSYS Workbench to WAON.

  5. WAON automatically launches. All of the boundary conditions necessary for acoustic simulation are already fixed.
    You can check the vibrational distribution of the sound source.

  6. Select analysis process and the frequency and press the [Execute] button. You can choose either FMBEM or BEM for the analysis process. FEMBEM is highly effective for large-scale analysis, while BEM is typically used for acoustic simulation.

  7. After the simulation choose the mesh and frequency, then press the [Plot-Posi] button to see the result.

System Requirements

  • WAON
  • ANSYS Professional NLT or above
  • Windows 2000 or XP

*Please contact the local sales representative for more details