Derive the equation of motion given in Eq. (1) of Example 9.6 for the system in that example. The independent variable y is measured from the equilibrium position of the system, m is the mass of the motor and platform, c is the total damping coefficient of the dashpots, k is the total constant of the linear elastic springs, ωr is the angular velocity of the unbalanced rotor, ε is the distance of the eccentric mass from the rotor axis, and mu is the eccentric mass. Note that m includes the eccentric mass so that the nonrotating mass is equal to m − mu.
Figure P9.54
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