ADLINK PCI-8158 - Manual (Page 58)

48 Operation Theory
these areas. We call this shape as “bell” curve. It adds a linear
curve between the upper side of s-curve and lower side of s-curve.
This shape improves the speed of acceleration and also reduces
the vibration of acceleration.
For a bell curve, we define its shape’s parameter as below:
X
Tacc: Acceleration time in second
X
Tdec: Deceleration time in second
X
StrVel: Starting velocity in PPS
X
MaxVel: Maximum velocity in PPS
X
VSacc: S-curve part of a bell curve in deceleration in PPS
X
VSdec: S-curve part of a bell curve in deceleration in PPS
If VSacc or VSdec=0, the acceleration or deceleration is a pure S-
curve without any linear components. The acceleration chart of
bell curve is shown below: