An electric motor of total weight W = 3330 lb is mounted on a simple supported beam with overhang…

An electric motor of total weight W = 3330 lb is mounted on a simple supported beam with overhang as shown in Fig. P3.10. The unbalance of the rotor is W’e = 50 lb-in.

(a) Find the amplitudes of forced vertical vibration of the motor for speeds 800, 1000. and 1200 rpm.

(b) Draw a rough plot of the amplitude versus rpm. Assume damping equal to 10% of critical damping.

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