Estimation of Hammerstein nonlinear systems with noises using filtering and recursive approaches for industrial control  

作　　者：Mingguang ZHANG Feng LI Yang YU Qingfeng CAO 

机构地区：[1]School of Electrical&Information Engineering,Jiangsu University of Technology,Changzhou,213001,China [2]College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou,225127,China

出　　处：《Frontiers of Information Technology & Electronic Engineering》2024年第2期260-271,共12页信息与电子工程前沿（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.62003151);the Changzhou Science and Technology Bureau,China(No.CJ20220065);the Qinglan Project of Jiangsu Province,China(No.2022[29]);the Zhongwu Youth Innovative Talents Support Program of Jiangsu University of Technology,China(No.202102003)。

摘　　要：This paper discusses a strategy for estimating Hammerstein nonlinear systems in the presence of measurement noises for industrial control by applying filtering and recursive approaches.The proposed Hammerstein nonlinear systems are made up of a neural fuzzy network(NFN)and a linear state`-space model.The estimation of parameters for Hammerstein systems can be achieved by employing hybrid signals,which consist of step signals and random signals.First,based on the characteristic that step signals do not excite static nonlinear systems,that is,the intermediate variable of the Hammerstein system is a step signal with different amplitudes from the input,the unknown intermediate variables can be replaced by inputs,solving the problem of unmeasurable intermediate variable information.In the presence of step signals,the parameters of the state-space model are estimated using the recursive extended least squares(RELS)algorithm.Moreover,to effectively deal with the interference of measurement noises,a data filtering technique is introduced,and the filtering-based RELS is formulated for estimating the NFN by employing random signals.Finally,according to the structure of the Hammerstein system,the control system is designed by eliminating the nonlinear block so that the generated system is approximately equivalent to a linear system,and it can then be easily controlled by applying a linear controller.The effectiveness and feasibility of the developed identification and control strategy are demonstrated using two industrial simulation cases.

关 键 词：Hammerstein nonlinear systems Neural fuzzy network Data filtering Hybrid signals Industrial control 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]