When the electric motor is resting on the beam, the static deflection of the beam is δs = 15 mm. The motor is not perfectly balanced, so when it is operating the unbalanced mass is equivalent to a mass mu = 200 g at a distance of ε = 150 mm from the axis of the rotor. The combined mass of the motor and sprung mass of the beam is mc = 40 kg.
Determine the amplitude of steady-state vibration of the motor if the rotor is spinning at ωr = 150 rpm.
Figure P.74
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