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Damping motion~

  1. Feb 18, 2006 #1
    if the amplitude of a damped oscillation is decrease to 1/e after n periods, how can i show that the frequency is about [1-(8pi^2n^2)-1]times the frequency of undamped ocillations? can i assume that the oscillation is critical damping such that the term b/2m and k/m can be cancel in the expression of the damped frequency and natural freuency relation?

    thanks for attention!!

    yukyuk
     
  2. jcsd
  3. Feb 18, 2006 #2

    Physics Monkey

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    You know the damping factor and the modified period in terms of the undamped period and the damping constant. You should probably start by evaluating the damping factor after n periods and setting it equal to 1/e.
     
  4. Feb 19, 2006 #3
    To physics monkey,

    Thanks for your help but i cannot understand what you mean? how can i write out the relation between the damped period and undamped~ quite confusing !!:frown: Also why I start by evaluating the damping factor after n periods and setting it equal to 1/e????

    yuk
     
  5. Feb 19, 2006 #4

    Physics Monkey

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