Basics of Frequency Domain Analysis in Structural Mechanics
In the final part of this introductory course on structural mechanics modeling in COMSOL Multiphysics®, we cover how to perform a frequency-domain analysis. We begin with providing an introduction to this type of analysis before completing a model build where we demonstrate conducting a few different study types.
Discussion: Frequency Domain Analysis
When performing a frequency-domain analysis in COMSOL Multiphysics®, we study the linear response of a structure to a harmonic excitation. Here, we begin with an overview of this type of analysis and outline the various preset study types available for performing it. These options include prestressed, modal, and reduced-order studies. We then provide a brief introduction to prestressed analysis and discuss how in a prestressed structure there may be significant effects on the frequency response. We similarly provide an introduction to mode superposition and explain how it is useful for reducing computational time and resources, especially for frequency-domain analyses.
We also cover the study steps included in the following study types:
- Frequency Domain
- Frequency Domain, Prestressed
- Frequency Domain, Modal
- Frequency Domain, Prestressed, Modal
Demo: Modeling the Frequency Response of a Structure
In the demonstration below, we perform a frequency domain-analysis and then a frequency-domain prestress analysis of the same bracket tutorial model seen in previous parts of the course. To follow along in the software, open the basic bracket model in the Application Libraries (found under Structural Mechanics Module > Tutorials).
The objective of the demonstration is to show the differences in the structural response of the bracket with and without prestress. Step by step, we show how to add a prestress load, a harmonic load, and add damping effects to the model before computing a Frequency Domain, Modal study and a Frequency Domain, Prestressed study.
Further Learning
After the demo, see these related resources:
- Blog – "Frequency Response of Mechanical Systems"
- Cyclopedia – Mode Superposition
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