When the electric motor is resting on the beam, the static deflection of the beam is δs =...

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.

It is determined that the largest allowable vibration amplitude of the motor is 10 mm. Determine the angular speed of the rotor at which this will occur.

Figure P.75