PID and nonlinear PID controller for tracking performance of XY table ball screw drive system

Yasin, Nurhafyzah (2015) PID and nonlinear PID controller for tracking performance of XY table ball screw drive system. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The demand for tracking performance and precision arouse the development of machine tool technology and the approach on how to design the control structure. One of the factor that contribute to the inaccuracy of a machine tool is the tracking performance of its drive system. The main objective of this research project is to design PID and NPID controller that is able to control the tracking performance of the system which is XY table ball screw drive system. XY table ball screw drive system is a basic structure of Computer Numerical Control (CNC) machine. This project will include the research regarding system design and analysis performance of PID and Nonlinear PID in term of Maximum Tracking Error and Root Mean Square Error (RMSE). Data collection for both controllers are observed numerically and experimentally using MATLAB/Simulink software and XY table ball screw drive system. This research project also proposes an approach to compensate multiple frequency components at y-axis of XY table. Moreover, various types of graphs are illustrated to show the comparison between simulation and experimental work of the controller. The results show than NPID controller has better tracking performance compared to PID controller. Based on Root Mean Square Error (RMSE), NPID controller shows better performance that PID controller with the percentage reduction are 0.3145 % for frequency of 0.3 Hz while for 0.5 Hz is 0.3788 %. However, further studied and improvement are desired in order to improve the tracking performance of the controller. This improvement includes addition of controller to compensate the tracking error from various different cutting force disturbances. In addition, it is recommended that the study on the design of the controller is carried out the actual cutting experiment in order to find the relationship about the cutting spindle speed and the performance of the controller.

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