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Real-time Control for CPS of Digital Airplane Assembly with Robust H-Infinity Theory

Tsinghua Science and Technology 2015年第4期20卷 376-384页

作者： Hui Li Linxuan Zhang Tianyuan Xiao Jietao Dong State CIMS Engineering Research Cente at Tsinghua University

This study introduces a real-time controller design method under the effects of network time delay and external disturbance. The study first introduces the digital, virtual, intelligent trend of airplane assembly and reveals the status and problems of digital airplane assembly studies. The Cyber-Physical System （CPS） structure is then proposed for digital airplane assembly, and the real-time control issues are discussed. Then, the question of real- time control undertaken by a parallel robot is simplified to a control question with bounded time delay and complex interference, and a mathematical description is presented. Next, a robust Hoo controller with a disturbance degree of decay 7 is designed according to the mathematical description. Finally, a simulation is conducted. All of the experiment results show the feasibility of the above proposed methods.

关键词： cyber physical system network time delay robust H-infinity control linear matrix inequality

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Linearizing Control of Induction Motor Based on networked Control Systems

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International Journal of Automation and computing 2009年第2期6卷 192-197页

作者： Jun Ren Chun-Wen Li De-Zong Zhao Department of Automation Tsinghua University Beijing 100084 PRC

A new approach to speed control of induction motors is developed by introducing networked control systems （NCSs） into the induction motor driving system. The control strategy is to stabilize and track the rotor speed of the induction motor when the network time delay occurs in the transport medium of network data. First, a feedback linearization method is used to achieve input-output linearization and decoupling control of the induction motor driving system based on rotor flux model, and then the characteristic of network data is analyzed in terms of the inherent network time delay. A networked control model of an induction motor is established. The sufficient condition of asymptotic stability for the networked induction motor driving system is given, and the state feedback controller is obtained by solving the linear matrix inequalities （LMIs）. Simulation results verify the efficiency of the proposed scheme.

关键词： Induction motor feedback linearization networked control system (NCS) network time delay linear matrix inequality(LMI).

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