Siemens SINUMERIK 840Di Function Manual page 173

However, a time t2-t1 below 200 ms and additional program processing time t3-t2 no greater
than 10% of t2-t1 produces this time characteristic:
Fig. 2-7
2.3.6 Dynamic response adaptation
Key statement
Highly dynamic acceleration and deceleration processes during machining can cause
excitation of mechanical vibrations of machine elements and consequently a reduction of the
surface quality of the workpiece. The function: "Dynamic response adaptation" therefore
provides the option of adapting the dynamic response of acceleration and deceleration
processes to the machine conditions by means of the following parameters:
• Path dynamic response adaptation factor
• Excitation frequency
Continuous-Path Mode, Exact Stop, LookAhead (B1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Characteristic of the smoothed path velocity
With the adaptation factor of the path dynamic response, temporary changes in the path
velocity are executed with smaller dynamic response limit values. This adaptation factor
can be set for each channel for traversing motions with acceleration without (BRISK) and
with (SOFT) jerk limiting:
– Traversing motions with acceleration without jerk limiting:
MD20465 $MC_ADAPT_PATH_DYNAMIC[ 0 ] (path dynamic response adaptation)
The adaptation factor affects the acceleration.
– Traversing motions with acceleration with jerk limiting:
MD20465 $MC_ADAPT_PATH_DYNAMIC[ 1 ]
The adaptation factor affects the jerk.
The dynamic response limiting should only be active during deceleration and acceleration
processes that trigger mechanical vibrations larger than a specific limiting frequency, thus
causing excitation of machine resonances. This excitation frequency from which the
dynamic response limiting takes effect can be specified for each axis by means of:
MD32440 $MA_LOOKAH_FREQUENCY (smoothing frequency with Look ahead)
During machining, the NC identifies cyclically among all axes involved in the path the
minimum excitation frequency as the limiting frequency relevant for the dynamic response
adaptation.
Detailed Description
2.3 Continuous-path mode
2-25