To analyze the effect of thermal expansion, add a Prestressed Analysis, Eigenfrequency study.Īdding the Prestressed Analysis, Eigenfrequency study.
Orthotropic thermal expansion coefficients are used to highlight some properties of the solution. To better separate the various effects, Poisson’s ratio is set to zero, but this assumption does not change the results in any fundamental way.
The material parameters have values that are of the same order of magnitude as those for many other engineering materials. The beam geometry and mesh used in the example. Rectangular Beam ExampleĬonsider a rectangular beam with the following data: PropertyĬoefficient of thermal expansion, x directionĬoefficient of thermal expansion, y directionĬoefficient of thermal expansion, z direction Setting up simulations that accurately capture such small effects can be a challenging task, since several phenomena can interact. In very high precision applications, the frequency stability requirements might specify a precision at the ppb (parts-per-billion, 10 -9) level. The most common parameter is temperature, but the same type of phenomena could, for example, be caused by hygroscopic swelling due to changes in humidity. Some devices require a very high degree of frequency stability with respect to changes in the environment. Studying Temperature-Dependent Eigenfrequencies We also explore effects like stress softening, geometric changes, and the temperature dependence of material properties.
How to take integral a surface in comsol 5.1 how to#
In this blog post, we show how to do this using COMSOL Multiphysics® version 5.3.
In some applications, particularly within the MEMS field, it is important to study the sensitivity of a device’s eigenfrequencies with respect to a variation in temperature.
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