JRM Vol.30 No.6 pp. 950-957
doi: 10.20965/jrm.2018.p0950


Operator-Based Control System Analysis and Design for Nonlinear System with Input and Output Constraints

Shuhui Bi*, Lei Wang**, Shengjun Wen***, and Liyao Ma*

*School of Electrical Engineering, University of Jinan
No.336 West Road of Nanxinzhuang, Jinan, Shandong 250022, China

**HRG (Shandong) Intelligent Equipment Research Institute
No.1268 Gongye 4 Road, Jinan, Shandong 250000, China

***Zhongyuan University of Technology
No.41 Zhongyuan Load, Zhengzhou 450007, China

May 3, 2018
October 16, 2018
December 20, 2018
operator-based nonlinear system analysis, input and output nonlinear constraints, nonlinear uncertain system
Operator-Based Control System Analysis and Design for Nonlinear System with Input and Output Constraints

A nonlinear control system with output constraint

Smart material-based actuators and sensors have been widely used in practice owing to their various advantages. However, in the working process of these actuators and sensors, their output responses always deduce non-smooth nonlinear constraints. The constraint resulting from the actuator is called the input constraint and the constraint caused by the sensor is called the output constraint. These input and output constraints may induce inaccuracies and oscillations, severely degrading system performance. Therefore, the input and output constraints brought about by actuators and sensors should be considered in control system design. In this paper, system analysis for a nonlinear system with input and output constraints will be considered. The effect from the input constraint to the internal signal in the control system will be discussed. Moreover, the influence of the output constraint on the whole system will be studied. Further, the sufficient conditions for maintaining the stability of the system are obtained. Then, by using the robust right coprime factorization approach, an operator-based internal model like control structure is proposed for mitigating the input and output constraints. Finally, the effectiveness of the proposed design scheme will be confirmed through numerical simulation.

Cite this article as:
Shuhui Bi, Lei Wang, Shengjun Wen, and Liyao Ma, “Operator-Based Control System Analysis and Design for Nonlinear System with Input and Output Constraints,” J. Robot. Mechatron., Vol.30, No.6, pp. 950-957, 2018.
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