检索结果-内蒙古大学图书馆

IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： J. Abonyi R. Babuska M. Setnes H.B. Verbruggen F. Szeifert Department of Information Technology and Systems Control Engineering Laboratory Delft University of Technnology Delft Netherlands Department of Chemical Engineering Cybernetics University of Veszprem Hungary

This paper presents an algorithm for incorporating of a priori knowledge into data-driven identification for dynamic fuzzy models of the Takagi-Sugeno type. Knowledge about the modeled process such as its stability minimal or maximal static gain, or the settling time of its step response can be translated into inequality constraints on the consequent parameters. By using input-output data, optimal parameter values are then found by means of quadratic programming. The proposed approach was successfully applied to the identification of a laboratory liquid level process.

关键词： Parameter estimation Fuzzy systems Fuzzy sets Quadratic programming Nonlinear dynamical systems Laboratories Cybernetics Stability Takagi-Sugeno model chemical technology

来源：评论

学校读者我要写书评

暂无评论

On adaptive smoothing of empirical transfer function estimates

引用

IFAC Proceedings Volumes 1999年第2期32卷 4183-4188页

作者： Anders Stenman Fredrik Gustafsson Daniel E. Rivera Lennart Ljung Tomas McKelvey Department of Electrical Engineering Linköping University SE-581 83 Linköping Fax: +46 13 28 26 22 Sweden Department of Chemical Bio and Materials Engineering and Control Systems Engineering Laboratory Arizona State University Tempe Arizona USA

The determination of the right resolution parameter when estimating frequency functions for linear systems is a trade-off between bias and variance. Traditional approaches, like “window-closing” employ a global resolution parameter - the window width - that is tuned by ad hoc methods, usually visual inspection of the results. Here we suggest an adaptive method that tunes such parameters by an automatic procedure. A further benefit is that the tuning can be done locally, i.e., different resolutions can be used in different frequency bands. The ideas are based on local polynomial regression and the “just-in-time”-model concept. The advantages of the method are illustrated in numerical examples.

关键词： frequency-response methods non-parametric regression

来源：评论

学校读者我要写书评

暂无评论

Multi-level pseudo-random signal design and "model-on-demand" estimation applied to nonlinear identification of a RTP wafer reactor

Multi-level pseudo-random signal design and "model-on-demand...

引用

American control Conference (ACC)

作者： M.W. Braun D.E. Rivera A. Stenman W. Foslien C. Hrenya Department of Chemical Bio and Materials Engineering Control Systems Engineering Laboratory Arizona State University Tempe AZ USA Division of Automatic Control Department of Electrical Engineering Linköping University Linkoping Sweden Honeywell Technology Center Minneapolis MN USA

Guidelines are presented for specifying the design parameters of multi-level pseudo-random sequences in a manner useful for "plant-friendly" nonlinear system identification. These multi-level signals are introduced into a rapid thermal processing wafer reactor simulation and compared against a well-designed pseudo-random binary sequence (PRBS). The resulting data serves as a database for a "model on demand" (MoD) predictor. MoD estimation is attractive because it requires less engineering effort to model a nonlinear plant, compared to global nonlinear models such as neural networks. The improved fit of multi-level signals over the PRBS signal, as well as the usefulness of the MoD estimator, is demonstrated on validation data.

关键词： Signal design Semiconductor device modeling Guidelines Nonlinear systems Signal processing Rapid thermal processing Inductors Binary sequences Databases Neural networks

来源：评论

学校读者我要写书评

暂无评论

Comparison of global nonlinear models and "model-on-demand" estimation applied to identification of a RTP wafer reactor

Comparison of global nonlinear models and "model-on-demand" ...

引用

IEEE Conference on Decision and control

作者： M.W. Braun D.E. Rivera A. Stenman W. Foslien Department of Chemical Bio and Materials Engineering Systems Engineering Laboratory Manufacturing Institute Arizona State University Tempe AZ USA Division of Automatic Control Department of Electrical Engineering Linkoping University Linkoping Sweden Honeywell Technology Center Minneapolis MN USA

"Model on demand" (MoD) simulation of the temperature dynamics in a simulated rapid thermal processing (RTP) reactor is compared against various types of global models (ARX, semiphysical, combined semiphysical with neural net). The identification data is generated from an m-level pseudo-random sequence input whose parameters are specified systematically using a priori information readily available to the engineer. The MoD estimator outperforms the ARX model and a two semi-physical models, while matching the performance of a combined semi-physical with neural net model. This makes MoD estimation an appealing alternative to global methods because of its reduced engineering effort and simplified a priori knowledge regarding model structure.

关键词： Semiconductor process modeling Inductors Neural networks Predictive models Semiconductor device modeling chemical technology State estimation systems engineering and theory Automatic control Rapid thermal processing

来源：评论

学校读者我要写书评

暂无评论

Robust H ∞ observers for uncertain time-delay systems: (II) the discrete-time case

引用

IFAC Proceedings Volumes 1999年第2期32卷 3432-3437页

作者： Zidong Wang Biao Huang H. Unbehauen Systems and Control Group Department of Mathematics University of Kaiserslautern P.O. Box 3049 D-67653 Kaiserslautern Fax: ++49/631 205 3052 Germany Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 2G6 Canada Automatic Control Laboratory Faculty of Electrical Engineering Ruhr-University Bochum D-44780 Bochum Germany

In this note we consider the problem of H ∞ observer design for a class of uncertain linear discrete-time systems with delayed state and parameter uncertainties. The goal of this problem is to design a linear state observer such that, for the positive integer state time-delay and all admissible norm-bounded parameter uncertainties, the observation process remains robustly stable and the transfer function from exogenous disturbances to error state outputs meets the prespecified H ∞ norm upper bound constraint. The observer structure does not depend on the parameter uncertainties. A simple, effective algebraic methodology is developed to derive the conditions for the existence of the desired robust H ∞ observers, and the analytical expression of these observers is then characterized in terms of the matrix Riccati-like equations/inequalities. We provide a numerical example to demonstrate the validity and the applicability of the proposed approach.

关键词： Linear systems Uncertainty Time-delay Observers H-infinity control Robust stability

来源：评论

学校读者我要写书评

暂无评论

Robust H ∞ observers for uncertain time-delay systems: (I) the continuous-time case

引用

IFAC Proceedings Volumes 1999年第2期32卷 3426-3431页

作者： Zidong Wang Biao Huang H. Unbehauen Systems and Control Group Department of Mathematics University of Kaiserslautem P.O. Box 3049 D-67653 Kaiserslautern Fax: ++49/631 205 3052 Germany Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 2G6 Canada Automatic Control Laboratory Faculty of Electrical Engineering Ruhr-University Bochum D-44780 Bochum Germany

This note deals with the problem of H ∞ observer design for a class of uncertain linear systems with delayed state and parameter uncertainties. This problem aims at designing the linear state observers such that, for all admissible parameter uncertainties, the observation process remains robustly stable and the transfer function from exogenous disturbances to error state outputs meets the prespecified H ∞ on norm upper bound constraint, independently of the time-delay. The time-delay is assumed to be small but unknown, and the parameter uncertainties are allowed to be norm-bounded and appear in all the matrices of the state-space model. An effective matrix inequality methodology is developed to solve the proposed problem. We derive the conditions for the existence of the desired robust H ∞ observers, and then characterize the analytical expression of these observers. A numerical example demonstrates the validity and applicability of the present approach.

关键词： Linear systems Uncertainty Time-delay Observers H-infinity control Robust stability

来源：评论

学校读者我要写书评

暂无评论

Recursive least squares scheme for operating a class of continuous fermentation processes at optimal steady state productivity

引用

Journal of chemical Technology & Biotechnology 1999年第3期73卷

作者： Sing Kiong Nguang Xiao Dong Chen Systems & Control Group Department of Electrical and Electronic Engineering University of Auckland Private Bag 92019 Auckland New Zealand Food Science & Process Engineering Department of Chemical and Materials Engineering University of Auckland Private Bag 92019 Auckland New Zealand

This paper has developed a recursive least squares scheme for operating a class of continuous fermentation processes at the optimal steady state productivity. More precisely, the class of continuous fermentation processes under investigation is described by a widely accepted non-segregated fermentation process model. Based on a recursive least squares algorithm, an on-line estimation scheme for estimating the optimal set points for feed substrate concentration and dilution rate is developed. Finally, via simulation, it is shown that this on-line estimation scheme is robust against measurement time (sampling time). © 1998 Society of chemical Industry

关键词： continuous fermentation process model recursive least squares scheme parameter estimation

来源：评论

学校读者我要写书评

暂无评论

High frequency multi-input periodic operation of continuous fermentation process

引用

Journal of chemical Technology & Biotechnology 1999年第3期73卷

作者： Sing Kiong Nguang Xiao Dong Chen Systems and Control Group Department of Electrical and Electronic Engineering University of Auckland Private Bag 92019 Auckland New Zealand Food Science & Process Engineering Department of Chemical and Materials Engineering University of Auckland Private Bag 92019 Auckland New Zealand

This paper examines the problem of high frequency multi-input periodic operation of continuous fermentation process. Based on π-criterion published prevously, it is shown theoretically that a continuous fermentation process under the operation of simultaneous high frequency periodic change of feed substrate concentration and dilution rate is always superior over the steady state operation except at the optimal feed substrate concentration. This, however, is yet to be confirmed experimentally. Finally, via computer simulations, a good correlation between the simulation and theoretical calculation of the percentage of improvements on the process productivity is revealed. © 1988 Society of chemical Industry

关键词： continuous fermentation computer simulation fermentation model high frequency multi-point periodic operation

来源：评论

学校读者我要写书评

暂无评论

control structure selection for plantwide chemical processes

Control structure selection for plantwide chemical processes

引用

IEE Colloquium on Choosing the Right control Structure for Your Process (Digest No. 1998/280)

作者： D. Rossiter Yi Cao D. Owens Department of Chemical Engineering Loughborough University Loughborough UK Centre for Systems and Control Engineering University of Exeter Exeter UK

The selection of inputs and outputs for control design in plantwide chemical processes is the topic of this paper. The issues concerning the systematic selection of manipulable inputs and measurable outputs are discussed. Tools developed to help the design engineer select the "best", in some sense, process configuration are presented. Case studies are used to demonstrate the usefulness of the tools and their limitations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Globally Optimal control Structure Selection Using Branch and Bound Method 1

引用

IFAC Proceedings Volumes 1998年第11期31卷 185-190页

作者： Yi Cao Diane Rossiter David H. Owens Department of Chemical Engineering Loughborough University Loughborough LE11 3TU UK Centre for Systems and Control Engineering University of Exeter Exeter EX4 4QF UK

A general subset selection method, the branch and bound technique, is applied to a control structure selection problem. Using this method globally optimal results can be obtained without exhaustive evaluations. The minimum singular value is used as the criterion for the branch and bound method. The monotonicity of the minimum singular value is proven and a power iteration formula is derived for more efficient calculation. This method is applied to a highly integrated chemical plant, the HDA process.

关键词： Combinatorial mathematics control schemes controllability Global optimization Process control Singular value

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：