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Simple harmonic motion - vibration frequency

  1. Oct 18, 2010 #1
    I need to calculate the frequency of sinusoidal vibrations in simple harmonic motion. The only known values that I have are the acceleration amplitude and the vibration amplitude. Is there a way of calculating the frequency of vibration without knowing the period of the oscillations?
  2. jcsd
  3. Oct 18, 2010 #2

    Andrew Mason

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    The equation of motion is:

    [tex]F = ma = m\ddot{x} = -kx[/tex]

    The general solution is:

    [tex]x = A_0\sin(\omega t + \phi)[/tex] where [itex]\omega^2 = k/m[/tex]

    [itex]A_0[/itex] is the maximum amplitude of vibration (maximum x). The maximum acceleration occurs when x = ? What is the acceleration at that point? (hint: use the equation of motion to find maximum value for a).

    From that you should be able to determine [itex]\omega[/itex]

    Last edited: Oct 18, 2010
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