Smartphone Microspeaker and Port Acoustics: Linear and Nonlinear Analysis
Application ID: 90821
This tutorial model shows how to model a microspeaker located in a smart phone including the radiation through and interaction with the acoustic port that connects to the exterior. The model demonstrates a linear frequency domain analysis as well as a nonlinear time domain analysis.
A lumped electrical circuit is used for the electromechanical representation of the microspeaker (a classical Thiele-Small model). The circuit is coupled to the acoustic domain using the built-in Lumped Speaker Boundary feature.
In the frequency domain, the (linear) response of the system is analyzed for a range of frequencies from 100 Hz to 10 kHz. In the time domain, the distortion and additional nonlinear resistive losses associated with acoustic-generated vortex shedding at the port are modeled. Here the Nonlinear Thermoviscous Acoustic Contributions are added to the Thermoviscous Acoustics, Transient interface.
This model example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
- COMSOL Multiphysics® and
- Acoustics Module and
- Design Module and
- either the AC/DC Module, Battery Design Module, MEMS Module, Plasma Module, RF Module, or Semiconductor Module
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Tabella delle Funzionalità and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.