Virtual.Lab Acoustic FEM Training

David Herrin University of Kentucky

Dept. of Mechanical Engineering

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Exercise 2 Determine the acoustic modes of a construction cab

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Goals of Exercise 2 ü  Learn how to create a cavity mesh ü  Learn the basics of acoustic FEM ü  Interpret acoustic modal results

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Get Started ü  Begin Virtual Lab ü  Start > Acoustics > Acoustic Harmonic FEM ü  File > Import

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Set Mesh Parts Type ü  Tools > Set Mesh Parts Type

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Create Fluid Properties ü  Insert > Materials > New Materials > New

Fluid Material

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Assign Fluid Properties ü  Insert > Properties > New Properties > New

Acoustic Fluid Property

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Create Mesh Preprocessing Set ü  Insert > Acoustic Mesh Preprocessing Set

Step 1 Click on Cavity Mesh Part Step 2 Right Click on Acoustic Mesh Preprocessing Set and Update

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Insert Analysis Case ü  Insert > FEM Analysis Cases > Acoustic Mode

Analysis Case

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Analysis Setup

Double Click

Right Click then Compute/Update to Solve

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List Modal Frequencies

Right Click

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View Mode Shapes

Right Click

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View Mode Shapes

Double Click

Hide all mesh parts and the acoustic envelope for better viewing

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Acoustic Mode