STEM

STEM

What is a mode shape in context of vibration?

    • Keyur Kanade
      Ansys Employee
      What is a mode shape in context of vibration?
    • prajput
      Ansys Employee
      Consider a simple example of a guitar string. When you pluck a guitar string it may vibrate such that it forms a half sine wave when it vibrates (i.e. has only one crest in the center) or have a complete sine wave (i.e. has one crest and one trough along the length of the string) or have multiple sine waves on it. Each of these "forms" in which a string can vibrate are called mode shapes of vibration
    • Karthik R
      Administrator
      To add to the above example, each of those mode shapes will occur when the string is vibrating at certain characteristic frequencies. E.g. mode 1 may occur when the string is vibrating at 2 Hz, mode 2 may occur when the string is vibrating at 4 Hz etc. These are the natural frequencies associated with those mode shapes.
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