Design of NPID double hyperbolic for precise positioning of machine tool application

Mohmad Khalid, Nur Zalikha (2018) Design of NPID double hyperbolic for precise positioning of machine tool application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In machine tool, there are huge demands in term of tracking accuracy, robustness, low cost, better surface quality speed and high flexibility. However, the presence of disturbance in machine tool leads to low accuracy and precise positioning of machine tool. One of the factors that contribute to the inaccuracy of a machine tool is the tracking performance of its drive system so this research introduces the controller of Nonlinear PID (NPID) for improving the tracking accuracy of XY Table Ball-screw drive system. XY table ball screw drive system is a basic structure of Computer Numerical Control (CNC) machine. One new controller name of NPID Double Hyperbolic was proposed in order to ensure the better tracking performance of the system. In this controller, the hyperbolic function was included in general form of the controller. Two reciprocal hyperbolic algorithms are utilized for a nonlinear integral and nonlinear derivative. The main attribute is it will provide the smaller gain when biggest error is produced. The stability of the controller was presented by popov stability criterion. The controller will validate via simulation using matlab and experimental work using googol tech XY table ball screw drive system. This Controller will help to compensate the disturbance force that exist during the cutting operation with spindle speed of 1500 rpm, 2500 rpm, 3500 at tracking frequency of 0.2 Hz and 0.4 Hz. The effectiveness of the proposed controller is identified based on the maximum tracking error and root mean square error (RMSE). The results of the proposed controller show a better tracking accuracy with an improvement of 94.48% and 94.15% compared to the NPID controller and PID controller respectively.

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