Disturbance observer design for nonlinear systems represented by input-output models
journal contributionposted on 23.09.2019, 08:33 authored by Shihong Ding, Wen-Hua ChenWen-Hua Chen, Keqi Mei, David Murray-smith
A new approach to the design of nonlinear disturbance observers for a class of nonlinear systems described by inputoutput differential equations is presented in this paper. In contrast with established forms of nonlinear disturbance observers, the most important feature of this new type of disturbance observer is that only measurement of the output variable is required, rather than the state variables. An inverse simulation model is first constructed based on knowledge of the structure and parameters of a conventional model of the system. The disturbance can then be estimated by comparing the output of the inverse model and the input of the original nonlinear system. Mathematical analysis demonstrates the convergence of this new form of nonlinear disturbance observer. The approach has been applied to disturbance estimation for a linear system and a new form of linear disturbance observer has been developed. The differences between the proposed linear disturbance observer and the conventional form of frequency-domain disturbance observer are discussed through a numerical example. Finally, the nonlinear disturbance observer design method is illustrated through an application involving a simulation of a jacketed continuous stirred tank reactor system
National Science Foundation of China under Grants 61573170 and 31571571
Jiangsu Natural Science Foundation for Distinguished Young Scholars under Grant BK20180045
Priority Academic Program Development of Jiangsu Higher Education Institutions and the Six Talent Peaks Project in Jiangsu Province under Grant XNYQC-006.
- Aeronautical, Automotive, Chemical and Materials Engineering
- Aeronautical and Automotive Engineering