Functions; Acceleration Without Jerk Limitation (Brisk/Briska) (Channel/Axis-Specific); General Information - Siemens SINUMERIK 840D Function Manual

Mc axes and spindles
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12.2

Functions

12.2.1

Acceleration without jerk limitation (BRISK/BRISKA) (channel/axis-specific)

12.2.1.1

General Information

General Information
In the case of acceleration without jerk limitation (jerk = infinite) the maximum value is applied
for acceleration immediately. As regard to acceleration with jerk limitation, it differs in the
following respects:
● Advantages
Shorter processing times with the same maximum values for velocity and acceleration.
● Disadvantages
Increased load on the machine's mechanical components and risk of inducing high-
frequency and difficult-to-control mechanical vibrations.
Acceleration profile
a
max
v
max
t:
Figure 12-1
The following features of the acceleration profile can be identified from the figure above:
● Time: t
Sudden acceleration from 0 to +a
● Interval: t
Constant acceleration with +a
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
:
Maximum acceleration value
:
Maximum velocity value
Time
Velocity and acceleration schematic for stepped acceleration profile
0
- t
0
1
max
; linear increase in velocity
max
B2: Acceleration and jerk
12.2 Functions
349

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