EXAMPLE 16–5 A caliper brake is used 24 times per hour to arrest a machine shaft from a speed of
250 rev/min to rest. The ventilation of the brake provides a mean air speed of 25 ft/s.
The equivalent rotary inertia of the machine as seen from the brake shaft is 289
lbm · in · s. The disk is steel with a density γ = 0.282 lbm/in3, a specific heat capacity
of 0.108 Btu/(lbm · ◦F), a diameter of 6 in, a thickness of 1
4 in. The pads are dry
sintered metal. The lateral area of the brake surface is 50 in2. Find Tmax and Tmin for
the steady-state operation.