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I Where does natural frequency comes from?

  1. Oct 7, 2016 #1
    I know everything has a natural frequency that is a intrinsic property to the body in question. For example, a string vibrating has the largest amplitudes when it's vibrating near it's natural frequency, and the same thing happens with other things too (like the Tacoma Bridge).

    Natural frequencies also play a important role in control systems. Systems have natural frequencies that you have to take into account when you are designing controllers for them.

    While I understand reasonably well how natural frequencies "work", I can't really grasp where do they come from. I mean, is there a reason to why every body has a natural frequency? And why systems have large amplitude oscillations when in resonance?
     
  2. jcsd
  3. Oct 7, 2016 #2

    ZapperZ

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    The easiest answer is that they come from the boundary conditions.

    Zz.
     
  4. Oct 7, 2016 #3
    It has to do with what wavelengths fit in the given geometry and give rise to resonance. Using the speed of e.g., sound, in the object, the frequency is determined.
     
  5. Oct 7, 2016 #4
    Is there any book I could refeer to so as to learn more on the subject?
     
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