Pneumatic actuator system controller design

Ooi, Wei Zheng (2019) Pneumatic actuator system controller design. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Pneumatic actuator system with advantages such as low cost, eco-friendly to environment, high reliability and high power to weight ratio are the reason to its wide application in the automation industry nowadays. These advantages support the pneumatic actuators appear to be the alternatives choice other than the hydraulic actuator system and electric servo motors to execute automated work. However, the highly non-linearities of pneumatic actuators due to the friction force and compressibility of air cause the actuators difficult to reach an accurate target position. Therefore, controller need to be employed to control the system for solving the problems. Before the controllers can be designed, the mathematical model of the system is obtained. The model is then compared with experimental data for validation by using System Identification. After that, PID controller, which is the most common used controller in the industry is designed to control the system. The outcomes show that PI controller has the best performance among the PID base controllers. The performance of the controller is still able to be improved based on the PID base controller performance comparison results. So, Fuzzy Logic controller is designed with PID to solve the problem. From the results of performance comparison between Fuzzy PID, PID and Fuzzy Logic, it shows that Fuzzy PID has the best performance compared to PI controller while Fuzzy Logic controller is failed to be designed. Fuzzy PID controller has 0% overshoot and faster settling time than PI controller. The Fuzzy PID controller is proven as a more robust controller since it can withstand more load changes in the plant than PI controller

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