Siemens SINUMERIK 840D sl Function Manual page 185

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Dynamic response adaptation

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:

• Adaptation factor of the dynamic path response

• Excitation frequency

Basic logic functions: Continuouspath Mode, Exact Stop, LookAhead (B1)

Function Manual, 11/2006, 6FC5397-0BP10-2BA0

Characteristic of the smoothed path velocity

Via the adaptation factor of the dynamic path 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 ] (adaptation of the dynamic path

The adaptation factor acts on the acceleration.

– Traversing motions with acceleration with jerk limiting:

MD20465 $MC_ADAPT_PATH_DYNAMIC[ 1 ]

The adaptation factor acts on 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, after which the

dynamic response limiting activates, can be axis-specifically specified via the machine

MD32440 $MA_LOOKAH_FREQUENCY (smoothing frequency for LookAhead)

During the processing, the NC cyclically determines, for all the axes in the path, the

minimum value of their excitation frequencies as the limiting frequency for the adaptation

of the dynamic response.

Detailed description

2.3 Continuous -path mode

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