检索结果-内蒙古大学图书馆

American control Conference (ACC)

作者： Pradeep Y. Tiwari Eric F. Mulder Mayuresh V. Kothare Chemical Process Modeling and Control Center Department of Chemical Engineering Lehigh University Bethlehem PA USA Exxon-Mobil Chemical Baytown TX USA

We study the problem of multivariable anti-windup controller synthesis that incorporates trade-offs between unconstrained linear performance and constrained anti- windup performance. In our previous work [13], we presented a framework for simultaneous design of a linear output feedback controller and a static anti-windup compensator using Linear Matrix Inequalities (LMIs). This framework deviated from the conventional two step paradigm of anti-windup by proposing a one-step synthesis while still maintaining the anti-windup structure. However, the work in [13] did not provide conclusive demonstration of the efficacy of this formulation through realistic practical examples. In this paper, we further study the framework in [13] and explicitly demonstrate its capability in providing effective constrained anti-windup controller performance for two benchmark problems, viz. a vibration isolation table and a multivariable model for the longitudinal dynamics of an F8 aircraft.

关键词： chemical processes chemical engineering Aircraft Design methodology process control Cities and towns Output feedback Linear feedback control systems Linear matrix inequalities Vibration control

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

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

A DATA-BASED MEASURE FOR INTERACTIONS IN MULTIVARIATE SYSTEMS

引用

IFAC Proceedings Volumes 2006年第2期39卷 681-686页

作者： M. Rossi A.K. Tangirala S.L. Shah C. Scali Computer Process Control Lab Dept. of Chemical Engineering University of Pisa Pisa Italy Dept. of Chemical Engineering IIT Madras Chennai India Department of Chemical & Materials Engineering - University of Alberta Edmonton Canada

This article focusses on the control loop performance diagnosis of a multivariate system with emphasis on the presence of interactions and poor performance of control loops. The paper provides a data-driven technique to determine if a decentralized PI(D) + controller will suffice or if an advanced controller ( e.g. , MPC) is necessary to handle the control interactions and improve the loop performance. Two different techniques are proposed: the first one, based on the Power Spectrum of the error, analyzes interactions in the frequency domain, while the second one, based on the evaluation of a modified IAE (Integral of Absolute Error), analyzes interactions in the time domain. A performance index for the controller is also proposed for the case of set-point tracking. Simulation and experimental case studies are presented to highlight the applicability of the proposed techniques.

关键词： Interactions MIMO systems frequency domain time domain

来源：评论

学校读者我要写书评

暂无评论

Automated micro-ELISA system for allergy checker: A prototype and clinical test

Automated micro-ELISA system for allergy checker: A prototyp...

引用

10th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2006

作者： Ohashi, Toshinori Matsuoka, Yoshinori Mawatari, Kazuma Kitaoka, Mitsuo Enomoto, Tadao Kitamori, Takehiko Research Association of Micro Chemical Process Technology Japan Dept. of Otolaryngology Japan Red Cross Society Wakayama Medical Center Japan Graduate School of Engineering University of Tokyo Japan

We report a first prototype machine of an automatic and compact micro-ELISA system for clinical diagnosis of allergy. The excellent performances were verified in three times faster analysis time, one order smaller sample and reagents volume with enough sensitivity compared with conventional systems. The prototype was subjected to a clinical trial authorized by the Ethical Advisory Board and good correlations with conventional method have been verified with 82 allergy patients. We believe our system show most excellent performances as practical systems. © 2006 Society for Chemistry and Micro-Nano Systems.

关键词： chemical analysis

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

Kinetic study of catalytic hydrogenation of O-nitroanisole to O-anisidine in a microchannel reactor

Kinetic study of catalytic hydrogenation of O-nitroanisole t...

引用

Topical Conference on Applications of Micro-Reactor engineering 2006, Held at the 2006 AIChE Spring National Meeting

作者： Tadepalli, Sunitha Halder, Raghu Muslehiddinoglu, Jale Kientzler, Donald Lawal, Adeniyi Dept. of Chemical Biomedical and Materials Engineering Stevens Institute of Technology New Jersey Center for Microchemical Systems Castle Point HobokenNJ07030 United States Process R and D Bristol-Myers Squibb Company One Squibb Drive New BrunswickNJ08903 United States

ISBN: (纸本)9781604235258

Hydrogenation reactions are ubiquitous in the fine chemicals and pharmaceutical industries. The hydrogenation of o-nitroanisole to o-anisidine in methanol was selected as a model three-phase reaction for kinetics study in a packed-bed microchannel reactor using Pd metal supported on zeolite as a catalyst. The kinetics of three-phase hydrogenation reactions in conventional slurry or batch reactors is often limited by mass transfer of hydrogen through the liquid due to the limited solubility of hydrogen in organic substrates and solvents. These reactions are also highly exothermic, therefore adequate temperature control is of primary importance to reduce side reactions and to prevent thermal runaway conditions. The use of a microchannel reactor for such reactions provides improved mass and heat transfer rates which may ensure that the reaction operates close to intrinsic kinetics. In the present study, the rate data in the intrinsic kinetic regime were analyzed and found to be well represented by L-H type rate equations. Kinetic experiments were also conducted in a semi-batch reactor under similar reaction conditions as the microchannel reactor. The performance of the packed bed microchannel reactor was compared to that of the semi-batch reactor by evaluating the mass transfer resistance in each system.

关键词： Hydrogen

来源：评论

学校读者我要写书评

暂无评论

Letter to the editor

引用

AIChE Journal 2006年第5期52卷

作者： J. M. F. Silva A. Knoechelmann C. E. Lopes M. R. Wolf-Maciel Antonio J. A. Meirelles Chemical Engineering Dept. Technology Center Federal University of Pernambuco (UFPE) Recife PE Brazil 50670-901 Faculty of Chemical Engineering State University of Campinas (UNICAMP) and Chemical Process Dept.-Laboratory of Development Process Separation Cidade Universitária Zeferino Vaz-6066-Campinas São Paulo Brazil 13081-970 State University of Campinas (UNICAMP)-Food Engineering Dept. (FEA) Physical Separation Laboratory(LASEFI) PO.Box 6121 Campinas/SP 13083-970 Brazil

来源：评论

学校读者我要写书评

暂无评论

Static anti-windup controller synthesis using simultaneous convex design

Static anti-windup controller synthesis using simultaneous c...

引用

05AIChE: 2005 AIChE Annual Meeting and Fall Showcase

作者： Tiwari, Pradeep Y. Mulder, Eric F. Kotharel, Mayuresh V. Chemical Process Modeling and Control Center Department of Chemical Engineering Lehigh University Bethlehem PA 18015 United States ExxonMobil Chemical 5000 Bayway Drive Baytown TX 77520

We present a method for the synthesis of a control law which incorporates both a traditional linear output-feedback controller as well as a static anti-windup compensator. Unlike traditional anti-windup controller design in which the linear controller and anti-windup compensator are designed sequentially, our method synthesizes all controller parameters simultaneously, thus providing a priori account of the effects of saturation on the closed-loop dynamics. Moreover, we derive sufficient conditions for the quadratic stability and (possibly) multiple performance bounds on the closed-loop dynamics such that the entire synthesis is cast as an optimization problem over linear matrix inequalitics (LMIs).

关键词： Feedback control

来源：评论

学校读者我要写书评

暂无评论

Extended slug control for pipeline-riser systems

Extended slug control for pipeline-riser systems

引用

12th International Conference on Multiphase Production Technology '05

作者： Storkaas, Espen Godhavn, John-Morten Dept. of Chemical Engineering Norwegian University of Science and Engineering Norway Process Control Statoil R and D Norway

ISBN: (纸本)1855980649

control systems that prevent the development of riser slugging in pipeline-riser systems have in recent years been introduced on several offshore processing facilities. These control systems are based on active use of the topside choke valve to keep a pressure measured somewhere upstream of the riser constant. These control systems have been a great success, and are emerging as the standard method to avoid riser slugging in multiphase production pipelines. The active use of the topside choke valve for control purposes opens the door for several other interesting applications as there are other multiphase phenomena occurring in a pipeline-riser system that can cause operational problems for the downstream production facilities. Among these are surge waves. When the production rate in a gas-condensate pipeline is increased, the liquid holdup in the pipeline will go down. This means that during the transition period, an excess amount of liquid needs to be transported out of the pipeline before a new steady state can be reached. The excess liquid can cause the liquid rate out of the pipeline to exceed the liquid handling capacity of the receiving facilities. Start-up slugs occur when the pipeline is started up from shut-in conditions. These slugs are similar to surge waves as they are caused by an increase in the production rate. However, start-up slugs can be even more violent as they potentially can initiate riser slugs and thereby cause even larger peaks in the liquid production. In this paper we introduce a novel control structure that extends the scope of pipeline control by including suppression of surge waves and start-up slugs. The control system consists of a slug controller and individual flow controllers for each phase combined seamlessly through a minimum select function. The performance of the control system is illustrated with simulations from an industrial case study. © BHR Group 2005 Multiphase Production Technology 12.

关键词： Pipelines

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：