Acoustic Inertance

R2026b

Linear inertance in acoustic systems

Since R2026b

• 

Acoustic Inertance 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 / Acoustic Elements

Description

Add-On Required: This feature requires the Simscape Acoustics add-on.

The Acoustic Inertance block models a linear inertance using the equation

$$P=M\frac{dU}{dt}$$

where:

• P is pressure.

• M is acoustic mass or inertance.

• U is the volume velocity.

• t is time.

The Series resistance and Parallel conductance parameters represent small parasitic effects. Simulation of some circuits might require the presence of the small series resistance. For more information, see Modeling Best Practices (Simscape).

The conserving acoustic ports + and - correspond to the positive and negative terminals of the block, respectively. The volume velocity is positive if it flows from positive to negative. The pressure across the block is equal to the difference between the pressure at the positive and the negative terminal, P(+) – P(-).

Examples

New

Model a Helmholtz Resonator in Simscape Acoustics

Use Simscape™ Acoustics to model a Helmholtz resonator in the acoustic domain.

• Since R2026b
• Open Live Script

Ports

Conserving

+ — Positive terminal

acoustic

Acoustic conserving port associated with the positive terminal.

- — Negative terminal

acoustic

Acoustic conserving port associated with the negative terminal.

Parameters

Inertance — Inertance of acoustic inertance component

1e-6 (Pa*s²)/m³ (default) | nonzero scalar

Inertance value.

Series resistance — Effective series resistance of the component

1e-9 (Pa*s)/m³ (default) | nonnegative scalar

Effective series resistance of the component that causes small parasitic losses to the pressure.

Parallel conductance — Effective parallel conductance of the component

1e-9 m³/ (Pa*s) (default) | nonnegative scalar

Effective parallel conductance of the component that causes small parasitic losses to the volume velocity.

Version History

Introduced in R2026b