检索结果-内蒙古大学图书馆

Simultaneous Boundary and distributed Feedback Control of the Current Profile in H-mode Discharges on DIII-D

IFAC Proceedings Volumes 2014年第3期47卷 1568-1573页

作者： Mark D. Boyer Justin Barton Wenyu Shi William Wehner Eugenio Schuster John Ferron Mike Walker Dave Humphreys Francesca Turco Tim Luce Robert Johnson Benjamin Penaflor Lehigh University Bethlehem PA 18015 USA General Atomics San Diego CA 92121 USA Columbia University New York NY 10027 USA

Control of the current profile in tokamak plasmas has been shown to play an important role in achieving advanced scenarios that could enable steady-state operation. The nonlinearity and spatially distributed nature of the current profile dynamics motivate the use of model-based control designs. In this work, we consider a control-oriented model of the current profile evolution in DIII-D high-confinement (H-mode) discharges, and the problem of regulating the current profile around a desired trajectory. The PDE model is discretized in space with a finite difference method and a backstepping design is applied to obtain a transformation from the original system into a particular target system with desirable properties. The resulting boundary condition control law is complemented with control laws for the available distributed actuators. The combined control strategy uses nonlinear combinations of the total plasma current, total power, and line averaged density as actuators. Simulation and experimental results show the ability of the controller to track desired targets and to reject input disturbances.

关键词： Energy Control Nuclear Reactors Nonlinear Control distributed-parameter systems Lyapunov Stability

来源：评论

学校读者我要写书评

暂无评论

Local ISS of Reaction-Diffusion systems

引用

IFAC Proceedings Volumes 2011年第1期44卷 11018-11023页

作者： Sergey Dashkovskiy Andrii Mironchenko Faculty of Mathematics and Computer Science University of Bremen Bibliothekstraße 1 28334 Bremen Germany

Abstract In the present paper we study local input-to-state stability of reaction-diffusion control systems by viewing them as control systems, based on differential equations in abstract spaces. We develop Lyapunov methods for verification of local input-to-state stability property and prove linearisation principle, that allows studying of local input-to-state stability of nonlinear systems from the stability properties of linearised systems. We illustrate theory on two examples of linear and nonlinear reaction-diffusion equations.

关键词： Nonlinear control systems distributed-parameter systems stability analysis linearization Lyapunov methods

来源：评论

学校读者我要写书评

暂无评论

MODELING AND PREDICTIVE CONTROL OF CEMENT GRINDING CIRCUITS

引用

IFAC Proceedings Volumes 2002年第1期35卷 43-48页

作者： R. Lepore A. Vande Wouwer M. Remy Laboratoire d'Automatique Faculté Polytechnique de Mons 31 Boulevard Dolez B-7000 Mons Belgium Tel: +32 (0)65 374140 Fax: +32 (0)65 374136

The purpose of this paper is to show that a distributed-parameter model of a continuous ball mill can be developed by discretizing the particle size continuum into a few size intervals only. Despite this coarse discretization of the particle size distribution, the ball mill model provides a good representation of the real process, which can be combined with a classifier model to build a complete simulator of a closed-loop grinding circuit. This simplified process representation is compared with a detailed first-principle model previously developed and validated by the authors. The main advantage of the simplified model is that it can be easily incorporated in an on-line control scheme. For illustrative purposes, a NMPC scheme is implemented to regulate the product fineness when variations in the grindability of the raw material occur as a measurable disturbance. The control objective, based on a size interval content, is compatible with traditional fineness measurements.

关键词： distributed-parameter systems nonlinear models parameter estimation process control predictive control industrial production systems

来源：评论

学校读者我要写书评

暂无评论

A parameter Based Approach to Product Data Management Within Dynamic Networks

引用

IFAC Proceedings Volumes 2000年第17期33卷 375-382页

作者： Kamel Rouibah Kevin Caskey Reinhard Schmitt Depanment of Information and Technology Technology Management Eindhoven University of Technology P. O. Box 513 NL-5600 MB Eindhoven The Netherlands Siemens SGP Verkehrstechnik GmbH VT5 FW6 Eggenberger Str. 31 A-802l Graz Austria

Concurrent engineering requires designers to share information that can be incomplete or contradictory. Information integrity is even more important when this dynamic network crosses company borders to include customers and suppliers. This paper introduces a new modelling view based upon a parameter approach to maintain data validity and to support network dynamics. We then develop a four part implementation of this approach to co-ordination: a parameter checklist to provide engineering transparency, a parameter checklist with integrated processes for simultaneous engineering workflow, a logged parameter network for engineering change support, and a pre-defined parameter network for engineering organisation. The paper describes these four parts.

关键词： complex systems concurrent engineering distributed-parameter systems dynamic systems

来源：评论

学校读者我要写书评

暂无评论

OPTIMAL CONTROL OF DISPERSIVE TUBULAR CHEMICAL REACTORS: PART I

引用

IFAC Proceedings Volumes 2005年第1期38卷 621-626页

作者： F. Logist I.Y. Smets J.F. Van Impe Bio TeC Department of Chemical Engineering Katholieke Universiteit Leuven W. de Croylaan 46 B-3001 Leuven Belgium

This paper, the first of a series of two, deals with the determination of optimal steady-state jacket fluid temperature profiles for dispersive tubular chemical reactors, ranging from plug flow to perfectly mixed reactors. According to Pontryagin's minimum principle, the optimal control is of the bang-bang type for the proposed terminal cost criterion. The bang-bang switching position is numerically optimised, by means of a weighted shooting-type procedure for the determination of the reactor profiles, ensuring the Danckwerts boundary conditions are satisfied. Following this procedure the impact of dispersion on the optimised profiles is illustrated. In the second paper, the performance of the obtained optimal control laws will be compared with that of practically more feasible controls. Furthermore, the transient behaviour will be assessed.

关键词： chemical industry distributed-parameter systems model-based control optimal control reactor control second-order systems

来源：评论

学校读者我要写书评

暂无评论

Prescribed-time tracking for triangular systems of reaction-diffusion PDEs

引用

IFAC-PapersOnLine 2020年第2期53卷 7629-7634页

作者： Drew Steeves Leobardo Camacho-Solorio Mouhacine Benosman Miroslav Krstic Department of Mechanical & Aerospace Engineering University of California San Diego CA Mitsubishi Electric Research Lab Cambridge MA

Approximate controllability of systems of coupled parabolic partial differential equations has been of interest for a few decades, where the existence of open-loop control laws performing approximate state transitions within a finite time is studied. In this work, we specialize to systems of reaction-diffusion equations where the connectivity structure is triangular in the reaction parameters and the controls appear at the boundary. We first generate controllers by combining a decoupling backstepping approach with differential flatness that allow us to generate admissible trajectories for system outputs from a given initial condition. As a byproduct of our approach, we achieve approximate state transitioning for the system within a finite terminal time. We enhance our control law by introducing time-varying error feedback controllers which reject variations in initial conditions within the terminal time. The resulting control law not only performs the approximate control task but also output trajectory tracking, all within the terminal time which can be prescribed independently of initial conditions.

关键词： distributed-parameter systems linear systems trajectory planning closed-loop systems controllability

来源：评论

学校读者我要写书评

暂无评论

Control Problems Arising in Chemotherapy Under Evolving Drug Resistance

引用

IFAC Proceedings Volumes 1996年第1期29卷 914-919页

作者： Andrzej Świerniak Andrzej Polański Marek Kimmel Department of Automatic Control Silesian Technical University Akademicka 16 44-100 Gliwice Poland Department of Statistics Rice University P.O. Box 1892 Houston TX 77251 USA

In this paper, we present our recent results which may play a role in improving the situation in the practical implications of mathematical modeling of cancer chemotherapy. We are concerned with control problems for a model of the dynamics of emergence of resistance of cancer cells to chemotherapy, as understood based on recent progress in molecular biology. In some special cases of this model, their asymptotic behavior and the stability problem for the infinite dimensional case were studied. In the case of finite initial condition the stability conditions were derived by asymptotical analysis of the analytical solution to the system of equations. In the case of initial condition with infinite number of elements the stability verification was based on the spectral properties of the infinitesimal generator of the system.

关键词： Biomedical systems stability analysis distributed-parameter systems Bessel functions stochastic modelling

来源：评论

学校读者我要写书评

暂无评论

Boundary Control of a Transversely Vibrating Beam Via Lyapunov Method

引用

IFAC Proceedings Volumes 2000年第21期33卷 257-262页

作者： Mehrdad P. Fard Svein Ivar Sagatun Department of Engineering Cybernetics Norwegian University of Science and technology N7034 Trondheim-Norway Norsk Hydro ASA The research Center in Bergen N5020 Bergen-Norway

This paper discusses the boundary stabilization of a beam in free transversal vibration. We consider a nonlinear partial differential equation (PDE) and based on this model construct two linear control laws to stabilize the system. The first control law guarantees globally convergent of states, while the second control law results into an exponentially stable closed loop. The latter control law is formed by feedbacking slope and velocity of beam’s boundary displacement. Numerical simulations are performed to test each of the control laws. The outcome of simulations are compared and discussed. The novelty of this article is that globally convergece and exponentially stabilization of transversely vibration in a beam is achieved, via boundary control without resorting to truncation of model.

关键词： distributed-parameter systems Boundary value problem Vibration

来源：评论

学校读者我要写书评

暂无评论

Stabilization of Elastic systems by Means of Computer Vision Feedback

引用

IFAC Proceedings Volumes 1987年第1期20卷 31-38页

作者： P.K.C. Wang Department of Electrical Engineering University of California Los Angeles CA 90024 USA

In this paper, the use of computer VlSlon in the feedback stabilization of elastic systems arising in large space structures is explored. In particular, a spaceborne antenna with a large flexible reflector surface is considered. First, suppose that the reflector is coated with a light reflecting material, and is illuminated by a light source. From the intensity data of the reflector image obtained by a computer vision system, the displacement and velocity of the surface are estimated using a suitable reflectance model. Next, the estimation of surface motion with the aid of special markings is considered. From the image of the deformed markings, the displacement and velocity of the surface are constructed. Various methods for obtaining stabilizing feedback controls from the estimated displacement and velocity of the surface are discussed. The paper concludes with some experimental observations and a discussion of the application of computer vision feedback in controlling other types of distributed systems

关键词： Feedback stabilization large space structures elastic systems computer vision distributed-parameter systems

来源：评论

学校读者我要写书评

暂无评论

The Grassmannian approach versus a J -spectral factorization approach to approximation problems

引用

IFAC Proceedings Volumes 2003年第19期36卷 161-166页

作者： Orest V. Iftime Amol J. Sasane University of Groningen Department of Mathematics and Computing Science P.O. Box 800 NL-9700 AV Groningen The Netherlands. Institut Mittag-Leffler Auravgen 17 S-182 60 Djursholm Sweden.

Two approaches to solving the suboptimal Nehari problem are analyzed: the Grassmannian approach and a J -spectral factorization approach. Moreover, using the Grassmannian approach, a solution for the Hankel norm approximation problem is presented. The results apply to large classes of infinite-dimensional systems, and in particular to time-delay systems.

关键词： distributed-parameter systems Factorization methods Algebraic approaches

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：