Q2 Z2,(Q2) Z2(Q2) - Institute for Water Resources - U.S. Army

And the distance traveled, D c , during a coasting phase is
D =
2
CV - ct)dt = VT - 1/2cT .
C
c c
0
T b = V c /b. 15
14
(3.2q)
The braking phase of the deceleration may be handled in the same
manner as above. Suppose braking occurs at the rate b at the end of
the coasting phase until the vehicle comes to a stop. Then the time,
T b' required to brake from a velocity V c to a velocity zero is '
The distance traveled, D b . during the braking ph.ise is given by
. T 16
D
,
= j
b b bT
2
dt = -,21)T .
b b
0
(3.30) '
(3.31)
Of course the method by which a vehicle decelerates depends on
the type of vehicle and the accepted practice of its operators. De-
celeration characteristics would therefore have to be determined for
each vehicle-type studied. If, in addition, the constant rates of
coasting and braking did not turn out to be good approximations, then
other formulations, such as exponential or quadratic, could be used.
Delays and Cargo Capacity
In the preceding sections of this chapter, expressions concern-
ing maximum speed, acceleration time and distance, deceleration time
and distance were presented. It was shown above how these
58