The following common terms are used throughout this guide:
- Interior problem
The sound wave oscillates in an enclosure or propagates to the infinity in a constrained structure.
- Exterior problem
The sound wave radiates or is scattered into the infinite open space.
- FSI
Acoustic fluid-structure interaction.
- Coupled element
Acoustic element with FSI interface.
- Uncoupled element
Acoustic element without FSI interface.
- PML
Perfectly matched layers.
- IPML
Irregular perfectly matched layers.
- Sound-hard surface
A surface on which particle normal velocity is zero. The sound-hard surface is also referred to as the rigid wall, which is the default boundary condition.
- Sound-soft surface
A surface on which sound pressure is constrained.
- Transparent port
An exterior surface on which incident pressure is launched into the acoustic model and the reflected pressure wave is fully absorbed by a defined matched impedance that represents the infinity.
- Vibro port
An exterior surface on which incident pressure is launched into the acoustic model by the vibration of the structural surface.