The oscillating fan precesses sinusoidally according to the equation p = sin 1.5t, where =

The oscillating fan precesses sinusoidally according to the equation θp = β sin 1.5t, where β =

30◦; the fan blade spins at ωs = 1 800ˆi rev/min.

The weight of the fan and motor armature is 5.25 lb, and other masses can be assumed negligible;

gravity acts in the −ˆj direction. The principal mass moments of inertia are Is = 0.065 in · lb · s2 and I = 0.025 in · lb ·s2; the center of mass is located at RGC = 4 in to the front of the precession axis.

Determine the maximum moment, Mz, that must be accounted for in the clamped tilting pivot at C.

Figure P16.8