Design of Nonlinear Controller for Disturbance Suppression in Machine Tool

Chow, Weng Kang (2021) Design of Nonlinear Controller for Disturbance Suppression in Machine Tool. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Ballscrew drive system is one of the commonly system driver that used in milling machine because it can produce high speed and accurate position with liner motion. However, disturbance like cutting force must present during the milling operation, thus, causes poor tracking positioning. In this thesis, different spindle speed which 1000rpm, 1500rpm, and 2000rpm of cutting force will be analysed to know their characteristic. Besides, three controllers named PID, nonlinear-PID (NPID), and nonlinear-PID with triple hyperbolic (NPID-TB) controllers are designed and implemented into the ballscrew drive system that only executing one-axis directional. The performance of designed controller will be compared in term of tracking error reduction and disturbance rejection. In addition, the raw data of cutting force, motor constant, and the transfer function of the unidirectional ballscrew drive control system are taken from previous work due to the thesis is in simulation based and not implement into real plant. As conclusion, NPID-TB has more superior than the benchmark which PID, in term of tracking error reduction and disturbance rejection with maximum 31.95% and 76.71% respectively, and minimum 22.27% and 1.93% respectively.