1987 Fiscal Year Final Research Report Summary

Flotation Process Control by Adaptive Control Method

Research Project

Project/Area Number	61850111
Research Category	Grant-in-Aid for Developmental Scientific Research
Allocation Type	Single-year Grants
Research Field	資源開発工学
Research Institution	TOHOKU UNIVERSITY
Principal Investigator	CHIDA Tadashi Faculty of Engineering, Tohoku University, 工学部, 教授 (10005499)
Co-Investigator(Kenkyū-buntansha)	NIIBORI Yuichi Facalty of enginering, Tohoku University, 工学部, 助手 (90180562) SAKAI Noboru Faculty of Engineering, Tohoku University, 工学部, 助手 (20134009)
Project Period (FY)	1986 – 1987
Keywords	Flotation tester / MRACS / pH-conditioned process / robustness / ロバスト性
Research Abstract	This paper presents a fundamental sudy on the application of the model refernce adaptive control system (MRACS) to a mineral plant. The PID regulator is frewuently used in the plant. However, if is not available on the time-varying plant. because the PID parameters are usually necessary to be readjusted. Then, the MRACS is trid to apply in the plant. it automatically readjusts its parameters, but it is not robust to the randow noise. A mineral processing plant is usually time-varying, and theid input/output signals contain random noises. Therefore, it is necessary to improve the robustness to the noise on the application of the MRACS. Peterson et. al. (1982) presented a robust MRACS with a dead zone to the adaptation algorithm. However, this system can not be used without knowledge for the noise. This paper describes a method which corrects this defect and its application to the PH-conditioned process in a mineral processing plant. Some simulation results are illustrated to show the effectiveness of the presented control method. And next, PHconditioned process was set up and connected with a flotation tester. Then, the PH value was actually measured at the tester. The results show that this control method is available on the time-verying plant, and robust to the random noise.