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Lookup NU author(s): Dr Zheng Gong, Dr Dehong Huo
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
Fast tool servo (FTS) is an efficient and reliable method in precision machining for fabricating freeform surfaces or microarrays with sub-micrometric form accuracy. In this paper, a Lorentz force FTS is designed where the voice coil motor is located inside the slide, and four air bearings are used as support components. Three different control algorithms, namely conventional PID control, advanced PID control with velocity/acceleration feed-forward (FF) and sliding mode control (SMC) are implemented in the system, and corresponding Simulink simulation models are built including for both mechanical and electrical systems. The results show that advanced PID and SMC can reduce phase error and overshoot, and tracking error can be controlled at 3.13% at 50 Hz. A new hybrid control algorithm (PID + SMC + FF) is developed, with system tracking error subsequently decreased to 0.871% at 50 Hz. In addition, with a suitable compensation method, the steady state tracking error is further decreased to 0.029%. Consistent results from testing with signals of different input frequency also indicate the general effectiveness of the algorithm.
Author(s): Gong Z, Huo D, Niu Z, Chen W, Shyha I
Publication type: Article
Publication status: Published
Journal: Precision Engineering
Year: 2022
Volume: 75
Pages: 12-23
Print publication date: 01/05/2022
Online publication date: 20/01/2022
Acceptance date: 17/01/2022
Date deposited: 22/01/2022
ISSN (print): 0141-6359
ISSN (electronic): 1873-2372
Publisher: Elsevier
URL: https://doi.org/10.1016/j.precisioneng.2022.01.006
DOI: 10.1016/j.precisioneng.2022.01.006
ePrints DOI: 10.57711/vdnx-tv93
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