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Large deformation in modal analysis

  1. Dec 3, 2016 #1
    Hi all,
    I have been simulating the following rhombus compliant mechanism using Ansys Modal analysis to have a quick understanding about its mode shapes,,,, the problem is that the deformation is extremely large you can see this as the scale is (*10^-5 ) . This result is for sure unrealistic but what does it indicate or what might be my mistake in the modeling https://goo.gl/WbQcxJ
     
    Last edited: Dec 3, 2016
  2. jcsd
  3. Dec 5, 2016 #2

    Mech_Engineer

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    Hi Mohamed,

    As a general rule I would pay attention to the mode shapes and frequencies but ignore the deformation values in a modal FEA analysis. The amplitude of the individual modes is a mass-normalized value which doesn't typically allow for apples-to-apples comparisons between nodes. See here:

    https://www.physicsforums.com/threads/ansys-modal-what-does-the-deflection-result-represent.728097/
     
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