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Abstract: An
adaptive algorithm for generating smooth motion profile is proposed by
using piecewise 3-order spline curve. The algorithm provides second
derivative of displacement, first derivative of speed and continuity of
acceleration with speed, acceleration and jerk constraints, which avoids
the occurrence of intense vibration in high-speed machining. The
influence of these constraints on the motion profile is analyzed. Based
on these constraints, the algorithm can automatically adjust the period
of each transition procedure in order to obtain smooth motion profile.
The strategy of piecewise constant speed and smooth motion control is
also introduced. The algorithm is effective and has been adopted by CNC
system of newly developed high-speed glass engraving machine center.
Key words: CNC system High speed machining Smooth motion profile
3-order spline curve Piecewise constant speed
CLC No: TG659
国家863计划资助项目(863-512-06-04).
Received 20010302, received in revised form 20010920
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