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Heat Generation in a Vibrating Structure

Application ID: 2205

When a structure is subjected to high frequency vibrations, a significant amount of heat can be generated due to mechanical (viscoelastic) losses in the material. A second mechanism contributing to the slow temperature rise in a vibrating structure is called thermoelastic damping, and represents the energy conversion between mechanical and thermal energy.

In this example, a fully coupled thermoelastic response for a vibrating beam-like structure is computed by combining the stress-strain analysis with the linearized heat-transport equation. The analysis is performed in the frequency domain.

The temperature rise in the beam is then modeled as a transient heat-transfer problem, where the corresponding heat-transfer equation contains two source terms computed using the results of the frequency response analysis. These terms represent the heat generation due to mechanical losses in the material and nonlinear effects related to the thermoelastic damping.

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.