How to Do an FEA Vibration Analysis


FEA Vibration analysis results          A vibration analysis or modal analysis is a finite element analysis that tests a design for its natural frequencies. The natural frequencies of a model are the frequencies at which the model resonates at naturally. It is a common engineering design tool to design a product such that its natural frequencies lie in a range far away from any frequencies it will experience during its normal operating lifetime. If constructive interference between an internal frequency and an external frequency is achieved the design might vibrate itself apart. Follow these steps to run an FEA vibration analysis to prevent your part from seeing the same fate.

Step 1

Create your 3D geometry to accurately represent your design in a Cad based software program. A Cad program will allow you to easily create your engineering design and refine its geometry before importing it into a finite element analysis software tool for analysis.

Step 2

Once you have created your model to your liking, export the solid file into your FEA vibration analysis software. Once the file has been imported into the other program, run a geometry check in the FEA software to make sure there are no errors in the model. If there are fix them before proceeding to step 3.

Step 3

Choose a new analysis, and pick modal as your analysis type. Add material properties to your model as well as any loads, constraints, and conditions that you are designing your model for. Make sure the material properties you have entered accurately reflect your model, as they have the most bearing on the results of your vibration analysis.

Step 4

Applied Loads and Constraints mesh modelMesh your modal analysis model, choosing a relatively fine mesh. The finer the mesh the more accurate your results will be.

Step 5

Run your vibration analysis. Once the analysis is complete then load your results file into the FEA program’s post processor for study. You should now be able to display both the frequencies at which your design vibrates at as well as the mode shapes.

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