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System vibrations

  1. Nov 19, 2008 #1
    1. The problem statement, all variables and given/known data

    a bloc of mass m=175,5 kg is supported by 2 springs K=k/2 = (unknown) and a damper c (unknown). see vibrations.bmp

    at 950 RPM, a stroboscope shows that the excentric mass is at his highest and the mass m is at equilibrium position with an upward velocity.
    amplitude of the vibrations is 21,5 mm
    défault d'équilibrage mo[tex]\epsilon[/tex] = 0,18 kg*m

    the question is :

    natural frequency ? damping factor ? amplitude of vibrations at 1250 RPM

    2. Relevant equations

    3. The attempt at a solution

    I developped the equation of movement

    m[tex]\ddot{x}[/tex]+c[tex]\dot{x}[/tex]+Kx = mo[tex]\epsilon[/tex][tex]\omega[/tex]2sin([tex]\omega[/tex]t)


    Attached Files:

    Last edited: Nov 19, 2008
  2. jcsd
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