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Nonlinear Magnetostrictive Transducer

Application ID: 6063


Magnetostrictive transduction is used in sonars, acoustic devices, active vibration, and position control and fuel injection systems.

The transducer has a steel housing enclosing a drive coil. A magnetostrictive material is placed in the core, which works as an actuator when a magnetic field is produced by passing a current through the drive coil.

Magnetostrictive material exhibits free strain under the influence of magnetic field. In this 2D axisymmetric model, the nonlinear relationship between magnetostriction and magnetic field is implemented using a nonlinear constitutive relationship. A nonlinear B-H curve has also been used to reflect a realistic magnetic behavior. Interaction between the magnetostrictive material with a transducer made of magnetic steel is also modeled.

Magnetostriction also depends on the stress in the magnetostrictive material. This model considers the case when the material is sufficiently prestressed so as to obtain the maximum magnetostriction. This model can be used for the case when the material is under an isostress condition. For modeling the behavior under any particular stress state, an appropriate B-H curve for the material obtained under the given stress will have to be used.

This model is included as an example in the following products:

Structural Mechanics 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 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.