Question: A ceiling fan assembly of five blades is driven by a motor. The assembly is attached to the ceiling by a thin shaft fixed at

A ceiling fan assembly of five blades is driven by a motor. The assembly is attached to the ceiling by a thin shaft fixed at the ceiling. What is the natural frequency of torsional oscillations of the fan of Figure P3.2.

FIGURE P3.2 Shaft: G = 80 10 N/m L = 0.25 m

FIGURE P3.2 Shaft: G = 80 10 N/m L = 0.25 m r = 6 mm Motor: = 10 kg. m Each blade: T-11 kg m m = 0.4 kg F= 0.4 m

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