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Mechanical resonance

  1. Feb 13, 2008 #1


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    Is there any typical frequencies range which mechanical systems resonant at ?
  2. jcsd
  3. Feb 13, 2008 #2
    Yea, its natural frequency.
  4. Feb 13, 2008 #3


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    So what is the frequencies range ?
  5. Feb 13, 2008 #4


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    It is impossible to give a frequency range for a general mechanical system since the resonant frequency is specific to a particular mechanical system and is dependent on a large number of parameters.
  6. Feb 13, 2008 #5


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    I can't imagine mechanical system resonant at frequencies of GHz, But i can imagine electrical systems resonant at frequencies of MHz for example.
    So there is no order of magnitude for it?
  7. Feb 13, 2008 #6


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    Staff: Mentor

    Well, 1-100,000 is five orders of magnitude, but there is probably an upper limit based on materials properties. Amplitude has to go down as frequency goes up to avoid having the inertial forces tear apart the object or device.

    The equation for natural frequency is w^2=k/m
  8. Feb 13, 2008 #7


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    Nanomechanical resonators can have a resonance frequency of tens of MHz, large structures (buildings etc) less than 0.1 Hz.

    So the "typical " frequency range for mechanical resonance covers at least 8 orders of magnitude.
  9. Feb 14, 2008 #8

    Andy Resnick

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    Plus the (primary) resonance is usually quite broad due to dissipative processes. And there will be multiple resonances for different modes- compression, torsion, different axes, differences depending on where the exciter is and what direction it's operating.. on and on and on...
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