Thermal modelling of three-way mixing valves using Bezier curves for parameter estimation applications

被引：5

作者：

Fuerst, Yannick ^{[1
]}

Brandt, Stefan ^{[1
]}

Kriegel, Martin ^{[1
]}

机构：

[1] TU Berlin, Marchstr 4, D-10587 Berlin, Germany

来源：

JOURNAL OF PROCESS CONTROL | 2020年 / 90卷

关键词：

System identification; Parameter estimation; Mixing valve; Physical modelling; Grey-box model; Thermal behaviour; JModelica.org; SYSTEM-IDENTIFICATION; HAMMERSTEIN;

D O I：

10.1016/j.jprocont.2020.04.004

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Each mixing valve is characterized by its k vs -value and the valve characteristics. In mounted condition, the valve characteristics are deformed and the degree of the deformation is determined by the valve authority. Considering already installed mixing valves, neither the valve authority nor the course of the undeformed valve characteristics are exactly known. The lack of information poses a challenge when physically modelling the relationship between the inlet temperatures, the control signal and the outlet temperature. Based on Bezier curves, a universal non-linear grey-box model to describe the thermal valve behaviour is proposed. It is compared with a state space as well as a Hammerstein model and shows the advantages over black-box approaches. The trained model is very robust, able to predict measurement data very accurately and can be used in control design. The parameter estimation is performed using the Open Source platform JModelica.org. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页码：56 / 62

页数：7

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