MICROPROCESSOR-BASED COMPE' ENSATION OF LEADSCREW DRIVE KINEMATIC ERRORS BY A FORECASTING TECHNIQUE
A microcomputer-based forecasring technique for compensating leadscrew drive kine-matic errors by the DDS(Dynamic Data Systems)approach is proposed in this paper, The kinematic error of a particular leadscrew drive system was described by an ARMA(16，15) model. In order to facilitate on-line compensation, an AR (9) model was fit instead of the ARMA model, Both models revealed the same dominate error components and have similar spectral plots, Experiments were conducted on a Giddings & Lewis Model IOV Numericen. ter. The re-suits show that the cumulative pitch error can be reduced some 80 to 90% through compen-satlon at lower feedrates of the table and about 50% at the higher feedrates using the forecasring technique.
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