Siemens SINUMERIK 828D Function Manual page 189

Effects of smoothing on path velocity:
Interval t - t : The acceleration and deceleration process between t
1 2
take place because the lengthening of the machining time without the
acceleration process to v
smoothing factor of 80 % is applied.
Interval t - t : The acceleration and braking profile between t
3 5
this condition or takes longer than the parameterized smoothing time
T
Axn
Effects of the dynamic response adaptation:
Interval t - t : The acceleration process between t
3 4
MIN(T
acceleration reduced by an adaptation factor of 3.
Interval up to t : The acceleration up to t
1
the time period up to t
Note
The example shows that those acceleration or deceleration processes that are not eliminated
by the smoothing of the path velocity can be subsequently optimized by adapting the
dynamic path response. For this reason, both functions should always be activated, if
possible.
Example 2
Acceleration mode: SOFT
The path involves the 3 axes X = AX1, Y = AX2, Z = AX3.
The following parameters are assumed:
MD20465 $MC_ADAPT_PATH_DYNAMIC[1] = 1
MD20460 $MC_LOOKAH_SMOOTH_FACTOR = 0.0
MD32440 $MA_LOOKAH_FREQUENCY[AX1] = 10
MD32440 $MA_LOOKAH_FREQUENCY[AX2] = 10
MD32440 $MA_LOOKAH_FREQUENCY[AX3] = 20
This leads to a path velocity profile which is optimized in terms of time without smoothing the path velocity or
adapting the dynamic path response:
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
is less than the resulting time if a
12
= 2/20 Hz = 100 ms.
) = 1/20 Hz = 50 ms and is, therefore, executed with an
AXn
left over after path smoothing is stretched to
1
' by the dynamic response adaptation.
1
B1: Continuous­path Mode, Exact Stop, LookAhead
and t
1
and t does not fulfill
3 5
and t is shorter than
3 4
T = 1/20 Hz = 100 ms
AX1
T = 1/20 Hz = 100 ms
AX2
T = 1/20 Hz = 50 ms
AX3
3.4 Dynamic adaptations
does not
2
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