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Differential equation for unbalanced rotating force

  1. Dec 9, 2014 #1
    1. The problem statement, all variables and given/known data
    ##M\ddot{y} + k_{eq}y = me\omega^2\sin(\omega t)##

    What is ##m##?

    2. Relevant equations


    3. The attempt at a solution
    In the ODE above, ##M## is the total mass of the problem, correct? For instance, if we had a cantilever beam, ##M = m_b + m_m(0.23)## where ##m_b## is the mass of the beam and ##m_m## is the mass of the motor.

    Is ##m## the mass of the motor causing the unbalance or is it the mass of the whole system as well?
     
  2. jcsd
  3. Dec 12, 2014 #2

    OldEngr63

    User Avatar
    Gold Member

    Is there no figure associated with this problem?

    To just start with the ODE given, I think that the only truly correct answer is to say that
    m is the 13th letter of the alphabet.

    The problem is that there are many physical systems that give rise to a particular describing differential equation. To start with the ODE and ask what the parameters are is pure nonsense.
     
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