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Homework Help: Mode ratio vs Mode shape?

  1. Feb 27, 2012 #1
    This isn't a homework question in its entirety, I'm just wondering what the difference is between a Mode ratio and a mode shape? I'm taking a mechanical vibrations course and trying to figure out what the problem is asking for when it wants a mode shape...
  2. jcsd
  3. Mar 1, 2012 #2


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    Gold Member

    If the problem involves only two coordinates, then the ratio of those two coordinates at the natural frequency is the mode ratio (as I recall). If there are more than two coordinates involved to define the mode vector, this is called the mode shape.
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