Title: Enhancing position control in pneumatic systems using ANFIS and high-speed on-off valves with compound PWM

Authors: Guoxin Sun; Shuaipeng Li; Qihui Yu; Jiabao Zhang

Addresses: School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China ' School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China ' School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China ' School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China

Abstract: In the context of position servo control utilising compressed air as the primary power source, the challenge of achieving precise control while maintaining economic efficiency remains a central concern. Addressing the issue of the significant reliance on manual expertise in designing fuzzy controllers, we propose the implementation of an adaptive neuro-fuzzy inference system (ANFIS) to enhance fuzzy control through the integration of neural networks. This innovation entails the substitution of costly proportional valves with cost-effective high-speed on-off valves and the replacement of traditional pulse width modulation (PWM) with compound PWM. These adaptations serve to significantly extend the operational lifespan of the on-off valves. This strategic approach amalgamates the learning capabilities of neural networks with the reasoning aptitude of fuzzy logic, effectively addressing the intricate nonlinear characteristics inherent to pneumatic systems. Empirical findings underscore the effectiveness of this strategy, with step response overshoot below 3.1%, steady-state error less than 0.5%, steady-state error below 0.22 mm for square wave signals, relative root mean square error (RRMSE) less than 1.50 mm for harmonic signals, and robust tracking performance observed across diverse loads and high-pressure gas sources.

Keywords: adaptive neuro-fuzzy inference system; ANFIS; high-speed on-off valve; pulse width modulation; compound PWM; position control.

DOI: 10.1504/IJHM.2024.143182

International Journal of Hydromechatronics, 2024 Vol.7 No.4, pp.347 - 367

Received: 02 Oct 2023
Accepted: 27 Mar 2024
Published online: 06 Dec 2024 *

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