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Excitation from unbalanced mass

  1. Jan 12, 2016 #1
    1. The problem statement, all variables and given/known data
    A rigid body of mass M slides vertically inside a friction-less prismatic pair. It is linked to the fixed frame through the spring of stiffness k, and a viscous damper with coefficient c. Beside the body, a point mass m rotates with constant speed w(omega) on a circular trajectory of radius r.(mass M also includes the point mass m)

    2. Relevant equations
    I don't know how to be with point mass. How to related vertical displacements with rotational? Can anyone suggest something..?

    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jan 13, 2016 #2

    Nidum

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    Examples this type of problem are to be found in many text books .

    If you want to solve the problem yourself start by visualising the problem . When the eccentric mass is going around what do you expect to see the whole mechanism doing ?
     
  4. Jan 14, 2016 #3
    It is like washing machines model. If there was no rotating small mass, it would be much easier. How I realized it, as Ψ=Ωt and if Ψ is equal to Π/2, then centrifugal force Fc = mΩ2/r directed to upward. And if Ψ is -Π/2 it is downward. But how to be with equation of motion?
     
  5. Jan 14, 2016 #4

    Nidum

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