TAGGED: #Modal_Analysis, ultrasonic-sound-waves
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October 10, 2024 at 9:06 amper.pucherSubscriber
Hi everyone,
I want to evaluate the different modes and mode shapes in a structure (approximate size 1m x 1m x 1m) designed to accurately position micro-mechanical parts (± 200 nm). The machine produces vibrations in the ultrasonic range (around 40 kHz). I need to know whether this excitation can affect the accuracy of the structure.
Are there specific things I need to watch out for (like types of mesh or mesh size) in order to achieve accurate results at high freuqencies? Do I have to choose an element size which is at least 2 times smaller than the wave length of the 40 kHz ultrasonic wave?
Thanks in advance for your help.
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October 10, 2024 at 9:11 amErik KostsonAnsys Employee
Hi
In general the guideline would be to have about 6 elements (quadratic so say solid186) per wavelength.
See the course in modal analysis for more info on how to set it all up.
Thank you
Erik
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