Resonances in rooms and other closed cavities can be found. This is useful to
ensure mechanical vibrations don't set up strong standing waves in vehicle
cabins, etc.
Acoustic elements
2D
»3 & 6 node, triangle
»4 & 8 node, quadrilateral
3D volume
»4 node, tetrahedron
»8 node, hexahedron
Acoustic analysis
Modeling
» finds resonant modes
» only closed boundary problems, no leakages e.g through open windows
» solves the Helmholtz equation representing acoustic vibrations of an enclosed body of fluid