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Mingsheng Cao,Yumeng Bo,Huibin Gao 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.3
Iterative learning control (ILC) is an efficient technique applicable to improving the tracking performance of systems that have a repetitive nature. In this paper, point-to-point movements with time-iteration-varying disturbances are considered instead. A new output-based adaptive ILC scheme consisting of an adaptive second-order ILC and an iterative learning estimation of time-iteration-varying disturbances is proposed for a class of linear systems with unknown parameters. The proposed algorithm is used to improve trajectory tracking performance without requiring a plant model or a sensitivity function, and without assuming the initial condition to be zero. In order to verify the proposed algorithm, it is applied to a wafer stage, and the obtained tracking performance is compared with that obtained using a traditional second-order ILC algorithm; better results are obtained using the proposed method.
Design and control of extractive distillation for the separation of methyl acetate-methanol-water
Honghai Wang,Pengyu Ji,Huibin Cao,Weiyi Su,Chunli Li 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
The azeotrope of methyl acetate methanol and water was isolated using extractive distillation with water as entrainer. The pressure-swing extractive distillation (PSED) process and vapor side-stream distillation column (VSDC) with the rectifier process were designed to separate the methyl acetate, methanol and water mixture. It was revealed that the VSDC with the rectifier process had a reduction in energy consumption than the PSED process. Four control schemes of the two process were investigated: Double temperature control scheme (CS1), QR/F feedforward control of reboiler duty scheme for PESD (CS2), QR/F feedback control scheme for VSDC (CS3), the feedback control scheme of sensitive plate temperature of side-drawing distillation column to dominate the compressor shaft speed (CS4). Feed flow and composition disturbance were used to evaluate the dynamic performance. As a result, CS4 is a preferable choice for separation of methyl acetate-methanol-water mixture. A control scheme combining the operating parameters of dynamic equipment with the control indicators of static equipment was proposed in this paper. It means using the sensitive plate temperature of side-drawing column to control the compressor shaft speed. This is a new control scheme for extractive distillation