Adaptive parametric interpolation scheme with limited acceleration and jerk values for NC machining |
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Authors: | Rong Zhen Xu Le Xie Cong Xin Li Dao Shan Du |
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Affiliation: | (1) Shanghai Jiao Tong University, Shanghai, China |
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Abstract: | Parametric interpolation has many advantages over the traditional linear or circular interpolation in computer numerical control
(CNC) machining. The existing work in this regard is reported to have achieved constant feedrate, confined chord error and
limited acceleration/deceleration in one interpolator. However, the excessive jerk still exists due to abrupt change in acceleration
profile, which will cause shock to the machine as well as deteriorate the surface accuracy. In this paper, an adaptive interpolation
scheme incorporating machine’s dynamics capability consideration is proposed and illustrated in details. In the proposed algorithm,
the commanded feedrate is maintained at most of the time and adaptively reduced in large curvature areas to meet the demand
of the machining accuracy requirement, while at the same time, the acceleration and jerk values are limited within the machine’s
capabilities during the whole interpolation process. It ensures a high machining accuracy, eliminates the phenomenon of overshoot/undershoot
and reduces mechanical shock to the machine tools. The real-time performance of this interpolator is also measured to demonstrate
its practical application. Two non-uniform rational B-spline (NURBS) curve interpolation experiments are provided to verify
the feasibility and advantages of the proposed scheme. |
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Keywords: | Acceleration Chord error Jerk Look-ahead NURBS Parametric interpolator |
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