General Mechanical

General Mechanical

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Evaluating high frequencies within a structure

    • per.pucher
      Subscriber

      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.

    • Erik Kostson
      Ansys 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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