Research on the dynamic characteristics of pneumatic proportional regulator in pneumatic-loading system and design of fuzzy adaptive controller

• Published in: Science China. Technological sciences 2022-04, Vol.65 (4), p.956-965
• Main Authors: Wang, Na, Xu, LuYu, Xie, Fei, Shi, Yan, Wang, YiXuan
• Format: Article
• Language: English
• Subjects: Adaptive control; Control methods; Control systems design; Controllers; Dynamic characteristics; Engineering; Failure analysis; Fuzzy control; Linearity; Mechanical properties; Parameters; Proportional control; Servocontrol
• ISSN: 1674-7321; 1869-1900
• DOI: 10.1007/s11431-021-1932-1

Pneumatic proportional control servo regulator is the core component of a pneumatic-loading experimental system, which is very important in solving the overcharging problem. However, previous research on control of pneumatic proportional regulator in a pneumatic-loading experimental system led to failure in analysis of the influence of opening error of the switch regulator because it did not analyze the regulator basic working principle and process. The traditional control method cannot fully solve the overcharging problem nor ensure adequate control performance of the regulator. After seriously studying the working principle and key mechanical parameters of the valve, a fuzzy parameter-adaptive controller is designed by introducing a linear mixture of the pressure and opening errors of the switch regulator to reduce pressure overshoot and optimize its control performance. According to the fuzzy-control strategy based on the working characteristics and mechanical parameters of the valve, the overshoot phenomenon of the pneumatic-loading system is solved, and the pressure overshoot is eliminated. The error of the output air pressure of the regulator is 1.24%, which is small. The adjustable pressure range of the regulator is 0.2–0.6 MPa. The maximum deviation is 0.012 MPa. The linearity of the case is 1.34% F.S.