Small Cylindrical Orifice or Tube
R2026bSmall Cylindrical Orifice or Tube block
To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.
Libraries:
Simscape Acoustics /
Applications /
Tubes and Horns
Description
Add-On Required: This feature requires the Simscape Acoustics add-on.
This block models either a small orifice on a wall or baffle, or a short length of tube. The orifice is modeled as a mass, represented by an acoustic inertance, and a viscous loss, represented by an acoustic resistance. The inertance and resistance are connected in series.
The inertance value is modeled as
where:
ρ is the density of the fluid.
L is the length of the orifice.
A is the cross sectional area of the orifice [1].
The resistance value is modeled as
where μ is the kinematic viscosity of the fluid [1].
If multiple orifices with the identical dimension are present, Ma and Ra are divided by N, the number of orifices.
Examples
Condenser Microphone Modeling with Simscape Acoustics
Model a conventional condenser microphone using Simscape™ Acoustics.
Ports
Conserving
Parameters
References
[1] Esteves, Josué, Libor Rufer, Didace Ekeom, and Skandar Basrour. “Lumped-Parameters Equivalent Circuit for Condenser Microphones Modeling.” The Journal of the Acoustical Society of America 142, no. 4 (2017): 2121–32. https://doi.org/10.1121/1.5006905.
Version History
Introduced in R2026b
