检索结果-内蒙古大学图书馆

19th International Conference on Artificial Neural Networks (ICANN 2009)

作者： Tran, Vu Nam Brdys, Mietek A. Univ Birmingham Coll Engn & Phys Sci Dept Elect Elect & Comp Engn Birmingham B15 2TT W Midlands England

ISBN: (纸本)9783642042768

The paper consider optimizing Model Predictive Control (MPC) for nonlinear plants with output constraints under uncertainties. Although the MPC technology can handle the constraint in the model by solving constraint model based optimization task, satisfying the plant output constraints still remains a challenge. The paper proposes Robustly Feasible MPC (REMPC), which achieves feasibility of the outputs in the controlled plant. Hie RFMPC is applied to control quantity which is illustrated by application to a Drinking Water Distribution Systems (DWDS) example.

关键词： predictive control robust feasibility genetic algorithms robust output prediction optimization relaxation algorithm drinking water distribution systems

来源：评论

学校读者我要写书评

暂无评论

Numerical Analysis of a Frictional Problem Using the Parabolic Variational Inequalities

Numerical Analysis of a Frictional Problem Using the Parabol...

引用

第三届亚太国际工程中计算方法学术会议ICOME2009暨第九届全国工程中边界元、无网格等数值方法学术会议

作者：冯斌河北省秦皇岛市燕山大学西校区理学院

Numerical method of a frictional Problem using the parabolic variational inequalities is discussed. The equation of the frictional problem is given, then we obtain the parabolic variatinal inequaities of the second kind which is equivalent the frictional problem. The traditional idea to solve the variational inequalities is direct study of the original variational inequality. But the parabolic variational inequality of the second kind is difficult to solve directly because the time derivative term and the non-differentiable term. In view of the above difficulties we introduce a relaxation algorithm in this paper. Firstly, the parabolic variational inequalities of the second kind can be reduced to an elliptic vatiational inequality by using semi-discretization and implicit method in time, then we reduce the equivalent optimization problem. Secondly, we use numerical integration approximation the non-differentiable item and discrete the optimization problem by finite element method. Next, the relaxation algorithm is given and the convergence of the relaxation algorithm is proved. Finally, the given example proves that the algorithm is effectiveness and feasibility.

关键词： Frictional problem Parabolic variational inequalities Numerical integration Finite element method relaxation algorithm

来源：评论

学校读者我要写书评

暂无评论

Computer simulation of random sphere packing in an arbitrarily shaped container

引用

CMC-COMPUTERS MATERIALS & CONTINUA 2008年第2期7卷 109-118页

作者： Li, S. X. Zhao, L. Liu, Y. W. Peking Univ State Key Lab Turbulence & Complex Syst Study Coll Engn Beijing 100871 Peoples R China Chinese Acad Sci Inst Mech Beijing 100080 Peoples R China

Most simulations of random sphere packing concern a cubic or cylindric container with periodic boundary, containers of other shapes are rarely studied. In this paper, a new relaxation algorithm with pre-expanding procedure for random sphere packing in an arbitrarily shaped container is presented. Boundaries of the container are simulated by overlapping spheres which covers the boundary surface of the container. We find 0.4 similar to 0.6 of the overlap rate is a proper value for boundary spheres. The algorithm begins with a random distribution of small internal spheres. Then the expansion and relaxation procedures are performed alternately to increase the packing density. The pre-expanding procedure stops when the packing density of internal spheres reaches a preset value. Following the pre-expanding procedure, the relaxation and shrinking iterations are carried out alternately to reduce the overlaps of internal spheres. The pre-expanding procedure avoids the overflow problem and gives a uniform distribution of initial spheres. Efficiency of the algorithm is increased with the cubic cell background system and double link data structure. Examples show the packing results agree well with both computational and experimental results. Packing density about 0.63 is obtained by the algorithm for random sphere packing in containers of various shapes.

关键词： sphere packing random packing computer simulation relaxation algorithm containers

来源：评论

学校读者我要写书评

暂无评论

Thermo-piezoelectric finite element modeling for piezoelectric transformers

引用

JAPANESE JOURNAL OF APPLIED PHYSICS 2008年第4期47卷 2182-2188页

作者： Yang, Yao-Joe Chen, Chien-Cheng Kuo, Chi-Wei Lee, Chih-Kung Natl Taiwan Univ Dept Mech Engn Taipei 106 Taiwan Natl Taiwan Univ Inst Appl Mech Taipei 106 Taiwan

In this paper, we present the development of an efficient three-dimensional finite-element tool, NTUPZE-T, for analyzing the thermal effect of piezoelectric transformers. The tool combines a finite-element piezoelectric solver and a finite-element thermal solver to estimate the temperature distribution during device operation. Device dissipation energy was calculated by considering internal damping effects. This energy is considered as the heat source of the heat transfer equation for estimating the device temperature distribution. Since the material properties of piezoelectric materials are dependent on temperature, a self-consistent thermo-piezoelectric analysis procedure using the relaxation algorithm is proposed. The modeling results of a Rosen-modal-type piezoelectric transformer under different operating frequencies and electrical loads are presented. The experimental setup for measuring the device electrical performance and temperature distribution is described. Simulated voltage gains, phase differences, efficiencies, as well as temperature distributions are also validated with experimental results.

关键词： piezoelectric transformer finite element method thermo-piezoelectric effect relaxation algorithm

来源：评论

学校读者我要写书评

暂无评论

Distributed simulation applied to shipboard power systems

Distributed simulation applied to shipboard power systems

引用

IEEE Electric Ship Technologies Symposium (ESTS 2007)

作者： Huang, Qinghua Wu, Jian Bastos, Jimena L. Schulz, Noel N. Mississippi State Univ Dept Elect & Comp Engn Box 9571 Mississippi State MS 39762 USA

ISBN: (纸本)9781424409464

The development of shipboard power systems for the new generation of all-electric ships is challenging in two aspects. First, all new equipment needs to be tested before being installed onboard;otherwise, the design and testing process would become increasingly costly and risky. Second, the complexity of a shipboard power system demands the use of significant computational resources for detailed computer-aided analysis. Distributed simulation techniques can help reduce the computational load that simulation of shipboard power systems requires by partitioning the system into smaller, more manageable subsystems. Distributed simulation can also facilitate remote testing of equipment and collaboration among research teams located in geographically distant institutions. The initial step in distributed simulation requires achieving software-to-software communication over a network. This paper outlines the progress done at the Mississippi State University in the distributed simulation application to shipboard power systems. Both natural and signal coupling models for distributed simulation are developed and validated. For natural coupling, a general coupling method, which considers transmission lines as suitable decoupling points, is proposed. Distributed simulation tests on several systems, including a shipboard power system, are documented and simulation results demonstrate the feasibility of applying distributed simulation techniques in advanced shipboard modeling and simulation.

关键词： Decoupling method Distributed simulation Interface model relaxation algorithm Shipboard power system

来源：评论

学校读者我要写书评

暂无评论

An Improved NIRA algorithm of Nash Equilibrium and Its Application

An Improved NIRA Algorithm of Nash Equilibrium and Its Appli...

引用

2007 IEEE International Conference on Automation and Lofistics

作者： Guangwen Kong Daoli Zhu Department of Management Science Fudan University No.220 Handan Road Shanghai China 200433

ISBN: (纸本)9781424415304;1424415306

Recent theoretical studies have shown that a relaxation algorithm can be used to .nd noncooperative equilibrium of synchronous *** games with nonlinear payoff functions and coupled constraints based on Nikaido-Isoda *** this study,this paper introduces an improvement to the Nash equilibrium algorithm with linear search step-size control. Compared with the other two choice of step-sizes, i.e constant step size and steepest-decent step-size, this algorithm performs a well balance between iterative steps and time *** the end of this paper, it provides a case study of .nancial investment in order to determine the optimal .nancial investment ratio by this algorithm.

关键词： Nash Equilibrium relaxation algorithm Financial Investment Nikaido-Isoda Function

来源：评论

学校读者我要写书评

暂无评论

Analysis of Nash equilibrium considering multi-commodity trade in coupled constraint electricity markets

Analysis of Nash equilibrium considering multi-commodity tra...

引用

International Conference on Power Systems Technology (POWERCON)

作者： Huang, Dawei Han, Xueshan Meng, Xiangxing Guo, Zhizhong Harbin Inst Technol Dept Elect Engn Harbin 150001 Peoples R China Shandong Univ Sch Elect Engn Jinan 250061 Peoples R China Harbin Inst Technol Dept Elect Engn Harbin 150001 Peoples R China

ISBN: (纸本)9781424401109

This paper adopts a Nash-Cournot game theoretic framework and uses a linear DC network to represent transmission constraints. The multi-dimensional Cournot game is presented and, the bilateral model of spatial market is bunt. Because of capacity constraints and Kirchhoff's laws, in this equilibrium model, the participants' strategy space is coupled. The market equilibrium is defined as a set of prices, generator outputs, transmission flows, and consumption that simultaneously satisfy each market participant's first order conditions for maximization of its profit while clearing the market. The multi-commodity trade in electricity markets is simulated by multi-dimensional Cournot model. A numerical method based on the Nikaido-Isoda function and a relaxation algorithm (NIRA) is presented for a calculation of coupled constraint Nash equilibrium in coupled constraint electricity markets. The interactions between energy and ancillary services markets and the transmission capacity limits effect are discussed. A three-bus bilateral market example with a DC model of the transmission fine constraints is used to test the feasibility of the proposed algorithm. Simulation results show that the proposed model can be used to analyze market power in electricity market and to guide the companies in making decisions.

关键词： electricity market game theory market power Nash-Cournot equilibrium Nikaido-Isoda function relaxation algorithm

来源：评论

学校读者我要写书评

暂无评论

Coupled constraint Nash equilibria in environmental games

引用

RESOURCE AND ENERGY ECONOMICS 2005年第2期27卷 157-181页

作者： Krawczyk, JB Victoria Univ Wellington Wellington New Zealand

The focus of this paper is on how to model and solve an environmental compliance problem using [Rosen, J.B., 1965. Existence and uniqueness of equilibrium points for concave n-person games. Econometrica 33 (3), 520-534] seminal idea of coupled constraint equilibrium. First, Rosen's results about the existence and uniqueness of a Nash normalised equilibrium for coupled constraint games are explained. These results are then combined with a numerical approach to game solutions based on the Nikaido-Isoda function. A river basin pollution game, which is a model for a common nonpoint source pollution problem, is solved numerically using this approach. In the game, the agents face a joint constraint on the total pollution, which defines a coupled constraint set in the combined strategy space. This makes the game special in terms of the strategy spaces. Unlike for standard games where they are defined separately for each player, here we have a joint constraint on the combined strategy space of all players. Hence, the game needs coupled constraint equilibrium as the solution concept. Static and (open-loop) dynamic equilibria are computed for the basin problem under the discussed equilibrium concept. All equilibria are instructive for the legislator, in that they contain information on how to choose the "optimal" charges, under which agents obey the constraints. (c) 2004 Elsevier B.V. All rights reserved.

关键词： compliance problem nonpoint-source pollution computational economics rosen coupled constraint games open-loop equilibrium Nikado-Isoda function relaxation algorithm

来源：评论

学校读者我要写书评

暂无评论

A method for generating reliable atomistic models of amorphous polymers based on a random search of energy minima

A method for generating reliable atomistic models of amorpho...

引用

Europhysics Conference on Computational Physics

作者： Curcó, D Casanovas, J Roca, M Alemán, C Univ Politecn Catalunya ETS Engn Ind Barcelona Dept Engn Quim E-08028 Barcelona Spain Univ Barcelona Fac Quim Dept Engn Quim E-08028 Barcelona Spain Univ Lleida Escola Politecn Super Dept Quim E-25001 Lleida Spain

A method for generating atomistic models of dense amorphous polymers is presented. The method is organized in a two-steps procedure. First, structures are generated using an algorithm that minimizes the torsional strain. After this, a relaxation algorithm is applied to minimize the non-bonding interactions. Two alternative relaxation methods, which are based simple minimization and Concerted Rotation techniques, have been implemented. The performance of the method has been checked by simulating polyethylene, polypropylene, nylon 6, poly(L,D-lactic acid) and polyglycolic acid. (c) 2005 Elsevier B.V. All rights reserved.

关键词： amorphous polymers atomistic simulation Monte Carlo generation algorithm relaxation algorithm ConRot SuSi

来源：评论

学校读者我要写书评

暂无评论

A method for generating reliable atomistic models of amorphous polymers based on a random search of energy minima

引用

COMPUTER PHYSICS COMMUNICATIONS 2005年第1-3期169卷 335-338页

关键词： amorphous polymers atomistic simulation Monte Carlo generation algorithm relaxation algorithm ConRot SuSi

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：