Piezoacoustic Transducer
Application ID: 1477
A piezoelectric speaker, colloquially known as a piezo buzzer, is a type of piezoelectric transducer that uses a piezoelectric crystal attached to a membrane. The movement of the crystal induces bending of the membrane and thus generates acoustic pressure waves. This model simulates an axisymmetric buzzer intended for ultrasonic applications. This type of transducer is typically driven at the resonance frequency, where the electric power is efficiently converted into radiated sound. A frequency sweep is used to help identify the resonance frequency. The radiation characteristics of the transducer are analyzed in terms of e.g. the beamwidth.
This example shows how to couple piezoelectric vibrations in a transducer to an acoustics pressure wave in a fluid such as air or water. The physics that are coupled and solved are piezoelectric stress-strain, an electric field, and pressure acoustics in a fluid.
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:
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 Specification Chart 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.
