
Referring to Figure 3.31 or Equation 3.233, it follows thata constantcable force of 124 lb for the entire
ascent would bring the diver to the surface with a differential pressure never exceeding the safe limit of 4
psi. The ascent would be considerably faster than the 691.75s shown in Figure 3.33. However, the profile
of Dp(t) shown in Figure 3.33 is a safer alternative than the exponential rise shown in Figure 3.31.
It may appear from Figure 3.33 that the diver’s depth becomes constant when the cable force is
switched from f
c
¼124 lb to f
c
¼W
eff
¼112.8 lb. Realistically, the diver cannot come to an abrupt
stop when the cable force changes in step fashion. ...