Balanced Armature Transducer - Frequency Domain Analysis
Application ID: 61741
This is a full vibro-electroacoustic simulation of a balanced armature (BA) transducer (also known as a receiver in some industries) which is a high performance miniature loudspeaker often used in hearing aids and other in-ear audio products.
The model is set up using a linear frequency domain perturbation approach on top of the DC analysis of the magnetic system. The electromagnetic coupling to the armature is done using the built-in Magnetomechanical Forces multiphysics coupling. The vibrating armature is part of a magnetic circuit with alternating flux imposed by the AC coil – causing a strong interaction with the unidirectional permanent (DC) magnetic field in the gap.
The measurement setup that consists of a tube and an ear canal simulator (a 711 coupler) is modeled through a transfer matrix representation using the Lumped Port condition. The transfer matrix data of the system is computed in the tutorial model Transfer Matrix of a Tube and Coupler Measurement Setup.
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 Grille des Spécifications 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.