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ISSN 2095-9184 (print), ISSN 2095-9230 (online)

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

Abstract: 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.

Key words: Hammerstein nonlinear systems; Neural fuzzy network; Data filtering; Hybrid signals; Industrial control

Chinese Summary  <19> 氢气管道发展现状及挑战:从材料、设计以及完整性角度

作者:花争立,高睿哲,邢百汇,尚娟,郑津洋,彭文珠,赵益明
机构:浙江大学,能源工程学院,特种装备研究所,中国杭州,310027
概要:本文回顾了氢气管道及天然气管道掺氢的发展现状。本文涵盖材料的氢相容性、氢气管道的设计方法、气体输送工艺、管道完整性评价与在线检测技术,以及天然气管道掺氢的评价方法。在此基础上,进一步指出了氢气管道建设过程中面临的一些挑战:1.氢气管道中高强钢的应用;2.高质量的氢气管道设计方法;3.管道中氢气流速的选择;4.现有天然气管道掺评价方法。最后,对未来发展方向提出了一些建议。

关键词组:氢气管道;氢脆;标准;管道设计;氢气流速


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DOI:

10.1631/FITEE.2300620

CLC number:

TP273

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On-line Access:

2024-08-27

Received:

2023-10-17

Revision Accepted:

2024-05-08

Crosschecked:

2023-12-03

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