检索结果-内蒙古大学图书馆

American control Conference (ACC)

作者： D.R. Vinson C. Georgakis J. Fossy Air Products and Chemicals Inc. Allentown PA USA Chemical Process Modeling and Control Research Center and Department of Chemical Engineering Lehigh University Bethlehem PA USA

The design and application of a new control structure for the Tennessee Eastman Challenge process is presented. This structure is primarily single-input single-output (SISO) but it has been augmented with the concept of extensive variable control to intuitively design multivariable structures for the regulation of the production rate and the product purities. A review of plant-wide control methodologies is provided to lay the basis for a discussion of SISO versus multivariable approaches.

关键词： controllability Computer aided software engineering control systems process design chemical products chemical processes process control Steady-state Recycling Production systems

来源：评论

学校读者我要写书评

暂无评论

Performance Assessment of Constrained controllers

引用

IFAC Proceedings Volumes 2004年第1期37卷 185-190页

作者： Lilong Huang Christos Georgakis Chemical Process Modeling and Control Research Center and Department of Chemical Engineering Lehigh University Bethlehem Pennsylvania 18015 Department of Chemical Engineering Chemistry and Material Science 728 Rogers Hall Polytechnic University Six Metrotech Center Brooklyn NY 11201 USA Phone: (718) 260- 3579 Fax: (718) 260-3125

The paper presents a new deterministic framework for assessing constrained control loop performance. The proposed dynamic performance index is based on the dynamic operating work of Uztürk and Georgakis (2002). It focuses on the time related characteristics of controllers' response to set-point changes or steptype disturbances. It explicitly takes into account the existence of constraints on manipulated variables. These constraints include minimum and maximum values as well as an upper limit on the rate of change of the input variables.

关键词： Constrained controller Performance Assessment Time Optimal control Minimum Settling Time Deterministic Disturbances

来源：评论

学校读者我要写书评

暂无评论

Plant friendly input design for system identification in closed loop

引用

IFAC Proceedings Volumes 2012年第16期45卷 1335-1340页

作者： Sridharakumar Narasimhan Xavier Bombois Dept. of Chemical Engineering IIT Madras Chennai India Delft Center for Systems and Control Delft University of Technology The Netherlands

Optimal experiment or input design is the scientific exercise of designing informative excitation signals for the identification of a real-life dynamic system. In the least costly input design framework, the input is designed such that the identification cost is minimized while meeting desired specifications on the quality of the identified model. Identification of real-life processes require that the identification be “plant-friendly”. These are typically imposed as constraints on experiment time, input and output amplitudes or input move sizes. This work focusses on an LMI based plant friendly input design in the least costly framework.

关键词： input design optimal experiment design identification for control convex optimization

来源：评论

学校读者我要写书评

暂无评论

Perfused multiwell tissue culture plates for drug and disease model development 11

Perfused multiwell tissue culture plates for drug and diseas...

引用

11th International Conference on Miniaturized Systems for Chemistry and Life Sciences, uTAS 2007

作者： Domansky, K. Inman, W. Lim, M.H.M. Serdy, J. Owens, B. Karackattu, S. Llamas Vidales, J.R. Littrell, R. Vineyard, L. Griffith, L.G. Biological Engineering Division Biotechnology Process Engineering Center CambridgeMA02139 United States Mechanical Engineering Dept. MIT CambridgeMA02139 United States Department of Chemical Engineering University of Cambridge CambridgeCB2 3RA United Kingdom

ISBN: (纸本)9780979806407

We have developed a perfused three-dimensional microbioreactor array in the format of multiwell tissue culture plate. Both theoretical and experimental data for the distribution of fluid flow and dissolved oxygen transport within the reactor are presented. Multi-day culture of rat hepatocytes with high cell viability is demonstrated. © 2007 CBMS.

关键词： Flow of fluids

来源：评论

学校读者我要写书评

暂无评论

Computationally efficient scheduled model predictive control for constrained nonlinear systems with stability guarantees

Computationally efficient scheduled model predictive control...

引用

American control Conference (ACC)

作者： Zhaoyang Wan M.V. Kothare Department of Chemical Engineering Chemical Process Modeling and Control Research Center Lehigh Universit Bethlehem PA USA Department of Chemical Engineering Lehigh University Bethlehem PA U.S.A Lehigh University Bethlehem PA US Dept. of Chem. Eng. Lehigh Univ. Bethlehem PA USA

We present a computationally efficient scheduled formulation of model predictive control (MPC) for constrained nonlinear systems with large operating regions. We design a set of local predictive controllers with their explicit regions of stability covering the desired operating region, and implement them as a single scheduled MPC which switches between the set of local controllers and achieves nonlinear transitions with guaranteed stability. This algorithm is computationally efficient and provides a general framework for scheduled MPC design.

关键词： processor scheduling Computational modeling Predictive models Predictive control Nonlinear systems Robust stability Nonlinear control systems control systems Switches Robust control

来源：评论

学校读者我要写书评

暂无评论

Robust synthesis of constrained linear state feedback using LMIs and polyhedral invariant sets

Robust synthesis of constrained linear state feedback using ...

引用

American control Conference (ACC)

作者： B. Pluymers M.V. Kothare J.A.K. Suykens B. De Moor Department of Electrical Engineering ESAT-SCD-SISTA Katholieke Universiteit Leuven Belgium Chemical Process Modeling and Control Research Center Lehigh University Bethlehem PA USA

This paper deals with the synthesis of linear feedback controllers for constrained discrete-time linear systems with polytopic uncertainty description. This problem was initially tackled using ellipsoidal robust invariant sets in the paper by Kothare (Kothare et al., Automatica, 1996) leading to an LMI-based optimization problem. The contribution of this paper is twofold. First the aforementioned method is extended to also take into account mixed state/input constraints and cross-terms between states and inputs in the objective function. Secondly, polyhedral invariant sets (Pluymers et al., ACC, 2005) are introduced in the synthesis algorithm in order to eliminate conservative constraint handling. This results in a provably more optimal feedback controller. The resulting method can either be used on-line in a receding horizon fashion to obtain a robust constrained controller or off-line in order to obtain a feedback controller with a guaranteed feasible region for use in dual-mode or other robust model-based predictive control algorithms. A numerical example is given to illustrate the new algorithm

关键词： Robustness State feedback Adaptive control control system synthesis Robust control Linear systems Uncertainty Predictive models Predictive control Prediction algorithms

来源：评论

学校读者我要写书评

暂无评论

Pseudolinear neural networks based nonlinear system modeling and control

引用

IFAC Proceedings Volumes 1999年第2期32卷 5519-5524页

作者： Yongji Wang Gregor Fernholz Sebastian Engell Dept. of Automatic Control Huazhong University of Science and Technology 430074 Wuhan P. R. China Process Control Laboratory Chemical Engineering Department D-44221 Dortmund University Germany

Pseudo-linear neural networks (PNN) based modeling and control strategy for a class of nonlinear dynamic systems is proposed. The training of the PNN is implemented by using a recursive prediction error (RPE) algorithm. The control strategy is based on one-step-ahead prediction, in which a direct controller design for an affine nonlinear system and the second order based optimization for a general nonlinear system are adopted. The stability of the closed loop control system is investigated, and some sufficient conditions for the local asymptotic stability are derived. The some simulated examples showed the good results of proposed control strategies in this paper.

关键词： neural networks predictive control learning algorithms nonlinear system asymptotic stability

来源：评论

学校读者我要写书评

暂无评论

Image reconstruction method and characteristic for tribo-electric tomography 6

Image reconstruction method and characteristic for tribo-ele...

引用

6th World Congress in Industrial process Tomography

作者： Machida, Masashi Kaminoyama, Meguru Process Development Center Idemitsu Kosan Co. Ltd 1-1 Anesaki-Kaigan IchiharaChiba299-0193 Japan Dept. Chemical Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan

ISBN: (纸本)9780853163220

Tribo-electric tomography system uses tribo-electric sensors for its sensing method. Tribo-electric sensor detects electrical charges in the sensing zone as a displacement current. This is a passive sensor and its signal intensity highly depends on distance between electrical charge and sensor. Inverse image reconstruction problem for tribo-electric tomography is investigated. The amount measured information and the local sensitivity in the sensing zone are examined with singular value decomposition in various shapes and sizes of pixels. The total amount information about in the sensing zone is limited up to the same number as that of the tribo-electric sensors and the local information about the central area in the sensing zone decreases according to the decrease of signal intensity along with the distance. Results of Scree tests show that the number of principle components corresponds to that of division of sensing zone in circumferential division but that in radius direction. © International Society for Industrial process Tomography, 2010. All rights reserved.

关键词： Singular value decomposition

来源：评论

学校读者我要写书评

暂无评论

Effect of number of sensors on tribo-electric tomography system 5

Effect of number of sensors on tribo-electric tomography sys...

引用

5th World Congress in Industrial process Tomography

作者： Machida, M. Kaminoyama, M. Process Development Center Idemitsu Kosan Co. Ltd 1-1 Anesaki-Kaigan IchiharaChiba299-0193 Japan Dept. Of Chemical Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama240-8501 Japan

ISBN: (纸本)9780853163213

An electrodynamic sensor senses the electrostatic charge carried by a particle. A tomography system using an electrodynamic sensor is called a tribo-electric tomography system. The source of the signal induced on the electrodynamic sensor is brought by the object to be measured and no excitation circuit is necessary. This electrodynamic sensing is a passive sensing and a fast and light weighted tomography system is expected. On the other hand, most of the tomography systems, like capacitance or resistance tomography systems, demand excitation circuit and are of the active sensing type. The number of measurements possible with passive sensing is equal to the number of sensors and that of active sensing to the number of the combination of two sensors. The passive sensing tomography system demands more sensors to be *** plan to improve the reconstructed images by increasing the number of the electrodynamic sensors in a tribo-electric tomography system. In our previous work, the image reconstruction methods were compared with both the back-projection and the least-square method using the ideal simulated data, which contains no noise. Increasing the number of sensors causes a decrease in the sensor's circumferential length and surface area. A smaller surface area in an electrodynamic sensor induces a smaller electrical current signal and the relative signal-noise ratio decreases. We investigate the influence of the surface area to signal intensity by solving the electrical field in the sensing zone using the finite element method. © 2007, International Society for Industrial process Tomography. All rights reserved.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Robust Predictive PI controller Based on First-Order Dead Time Model

引用

IFAC Proceedings Volumes 2008年第2期41卷 5808-5813页

作者： F. Arousi U. Schmitz R. Bars R. Haber Dept. of Automation and Applied Informatics Budapest University of Technology and Economics MTA-BME Control Research group Dept. of Advanced Process Control Shell Rheinland Refinery Köln/Wesseling Germany Inst. of Chemical Process Engineering and Plant Design University of Applied Science Cologne Germany

Predictive control algorithms compute the manipulated variable minimizing a cost function considering expected future errors. PI control algorithms can be equipped with predictive properties. Simple predictive control algorithms are derived using approximation of an aperiodic process by a first-order model with dead time. Applying a noise model the robustness properties of the algorithm are enhanced considering plant-model mismatch. The noise filter is considered as a design parameter. Simulation examples demonstrate the behavior of the predictive PI algorithm and the robustifying effect of the noise filter.

关键词：

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：