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Active Fault-Tolerant Control for a Class of Nonlinear Systems with Sensor Faults
Youqing Wang,Donghua Zhou,S. Joe Qin,Hong Wang 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.3
A general active fault-tolerant control framework is proposed for nonlinear systems with sensor faults. According to their identifiability, all sensor faults are divided into two classes: identifiable faults and non-identifiable faults. In the healthy case, the control objective is such that all outputs converge to their given set-points. A fault detection and isolation module is firstly built, which can produce an alarm when there is a fault in the system and also tell us which sensor has a fault. If the fault is identifiable, the control objective remains the same as in the healthy case; while if the fault is non-identifiable, the control objective degenerates to be such that only the healthy outputs converge to the set-points. A numerical example is given to illustrate the effectiveness and feasibility of the proposed method and encouraging results have been obtained.
Liang Cao,Youqing Wang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
This study investigates a new fault-tolerant control method for uncertain nonlinear systems with multiple intermittent faults and time-varying delays. The considered intermittent faults appear in sensors and actuators simultaneously. A Markov chain is used to describe the random occurrence and disappearance of intermittent faults. The uncertain nonlinear system with intermittent faults is augmented as a Markovian jump system. By using H-infinity control theory and linear matrix inequality (LMI), we design fault tolerant controllers to make augmented Markovian jump system work steadily. Several sufficient conditions for stochastic stability with given H-infinity performance index and the existence of output-feedback controllers are derived. The effectiveness of the proposed fault-tolerant method is validated by a continuously stirred tank reactor (CSTR).
Research status and development trend of three-dimensional colloidal crystals
Shuaibing Guo,Bing Yu,Fengyuan Gao,Song Wang,Youqing Shen,Hailin Cong 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
The three-dimensional colloidal crystal materials have unique optical properties and spatial structuredue to their ordered arrangement and have great potential to prepare three-dimensionally orderedmicroporous (3DOM) materials. This review outlines various methods for preparing three-dimensionalcolloidal crystals (3DCCs). The preparation methods of commonly used colloidal particles are introducedin detail, and the effects of different parameters on the assembly of 3DCCs are discussed. On this basis,using the colloidal crystal template (CCT) method to prepare 3DOM materials. After that, the commonstacking methods and defects of 3DCCs were analyzed. The latter part of this review discusses the mainapplications of 3DCCs, namely optical materials, adsorption materials, sensors, porous electrodematerials, inverse colloidal crystal (ICC) scaffolds, and other popular applications in recent years.