检索结果-内蒙古大学图书馆

American control Conference

作者： Maryam Soleimanzadeh Rafael Wisniewski S. Mojtaba Shakeri Automation and Control Section Electronic System Dept. Aalborg University Denmark

ISBN: (纸本)9781424474264

A wind deficit model for wind farms is developed in this work using finite volume method. The main question addressed here is to calculate approximately the wind speed in the vicinity of each wind turbine of a farm. The procedure followed is to solve the governing equations of flow for the whole wind farm. Spatial discretization is performed on a computational domain, using finite volume techniques. In ideal circumstances, wind speed will calculate on a fine mesh for the whole wind farm, where the effect of wind turbines is observed by means of their thrust coefficient. The end goal of this method is to assist the development of an analytical expression of an offshore wind farm wake. We focus in this work on wind deficit that can be used for better wind farm control strategies and load optimization.

关键词： Wind farms finite volume method wind speed Governing equation Wind Energy Conversion Systems volume method thrust force coefficients Wind

来源：评论

学校读者我要写书评

暂无评论

New development thoughts on the bio-inspired intelligence based control for unmanned combat aerial vehicle

引用

Science China(Technological Sciences) 2010年第8期53卷 2025-2031页

作者： DUAN HaiBin 1 ,SHAO Shan 2 ,SU BingWei 3 &ZHANG Lei 41 State Key Laboratory of Science and Technology on Holistic Flight control,School of automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics,Beijing 100191,China 2 Flight control Department,Shenyang Aircraft Design and Research Institute,Shenyang 110035,China 3 Beijing Institute of Near Space Vehicle’s System Engineering,Beijing 100076,China 4Integration and Project section,Air Force Equipment Academy,Beijing 100085,China 1. State Key Laboratory of Science and Technology on Holistic Flight Control School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China2. Flight Control Department Shenyang Aircraft Design and Research Institute Shenyang 110035 China3. Beijing Institute of Near Space Vehicle’s System Engineering Beijing 100076 China4. Integration and Project Section Air Force Equipment Academy Beijing 100085 China

Bio-inspired intelligence is in the spotlight in the field of international artificial intelligence,and unmanned combat aerial vehicle(UCAV),owing to its potential to perform dangerous,repetitive tasks in remote and hazardous,is very promising for the technological leadership of the nation and essential for improving the security of *** the basis of introduction of bioinspired intelligence and UCAV,a series of new development thoughts on UCAV control are proposed,including artificial brain based high-level autonomous control for UCAV,swarm intelligence based cooperative control for multiple UCAVs,hy-brid swarm intelligence and Bayesian network based situation assessment under complicated combating environments, bio-inspired hardware based high-level autonomous control for UCAV,and meta-heuristic intelligence based heterogeneous cooperative control for multiple UCAVs and unmanned combat ground vehicles(UCGVs).The exact realization of the proposed new development thoughts can enhance the effectiveness of combat,while provide a series of novel breakthroughs for the intelligence,integration and advancement of future UCAV systems.

关键词： bio-inspired intelligence unmanned combat aerial vehicle(UCAV) artificial brain autonomous control bayesian network bio-inspired hardware heterogeneous cooperative control

来源：评论

学校读者我要写书评

暂无评论

Behavior of winding to ground fault in transformer windings using discrete wavelet transform

Behavior of winding to ground fault in transformer windings ...

引用

4th IASTED Asian Conference on Power and Energy Systems, AsiaPES 2010

作者： Pothisarn, Chaichan Ngaopitakkul, Atthapol Pongchaisrikul, Worravut Apisit, Chaowat Jonpermpoonpol, Saridroje Department of Electrical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Distribution Control Section Automation System Division Provincial Electricity Authority 200 Ngam Wong Wan Road Jatujak Bangkok 10900 Thailand

ISBN: (纸本)9780889868557

In the literature for fault detection, most of research works have never been mentioned about the high frequency transformer including capacitances. This paper presents behaviour of winding to ground fault signals in a three-phase two-winding transformer. The advantage of the discrete wavelet transform (DWT) is that the band of analysis can be fine adjusted so that high frequency components and low frequency components are detected precisely, consequently DWT is considered herein. The fault is simulated using ATP/EMTP and the behaviour analysis of signals is performed using DWT. The variation of high frequency components of differential current signals is proposed in this paper. The results obtained from the analysis will be useful in the development of a detect fault scheme for power transformer in the future.

关键词： Power transformers

来源：评论

学校读者我要写书评

暂无评论

Abstraction of Continuous Dynamical Systems Utilizing Lyapunov Functions

Abstraction of Continuous Dynamical Systems Utilizing Lyapun...

引用

2010 49th IEEE Conference on Decision and control

作者： Christoffer Sloth Rafael Wisniewski Department of Computer Science Aalborg University 9220 Aalborg East Denmark Section of Automation & Control Aalborg University 9220 Aalborg East Denmark

ISBN: (纸本)9781424477456

This paper considers the development of a method for abstracting continuous dynamical systems by timed automata. The method is based on partitioning the state space of dynamical systems with invariant sets, which form cells representing locations of the timed automata. To enable verification of the dynamical system based on the abstraction, conditions for obtaining sound, complete, and refinable abstractions are set up. It is proposed to partition the state space utilizing sub-level sets of Lyapunov functions, since they are positive invariant sets. The existence of sound abstractions for Morse-Smale systems and complete and refinable abstractions for linear systems are shown.

关键词： Automata Clocks Continuous time systems Lyapunov method Silicon Upper bound Accuracy

来源：评论

学校读者我要写书评

暂无评论

A Robust Stabilization using State Feedback with Feedforward

A Robust Stabilization using State Feedback with Feedforward

引用

American control Conference

作者： Kumeresan A. Danapalasingam Anders la Cour-Harbo Girish Chowdhary Morten Bisgaard Section for Automation & Control Department of Electronic Systems Aalborg University 9220 Aalborg Denmark Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9781424474264

In a general nonlinear control system a stabilizing control strategy is often possible if complete information on external inputs affecting the system is available. Assuming that measurements of persistent disturbances are available it is shown that the existence of a smooth uniform control Lyapunov function implies the existence of a stabilizing state feedback with feedforward control which is robust with respect to measurement errors and external disturbances. Conversely, using differential inclusions parameterized as nonlinear systems with state and disturbance measurement errors, it is shown that there exists a smooth uniform control Lyapunov function if there is a robustly stabilizing state feedback with feedforward. This paper demonstrates that if there exists a smooth control Lyapunov function for a general nonlinear system with persistent disturbances for which one has previously designed a feedback controller, a feedforward always exists to be augmented for stability.

关键词： State feedback FEEDFORWARD Liapunov function Error measure external input FEEDFORWARD control There exists control strategy Stabilising

来源：评论

学校读者我要写书评

暂无评论

Energy Efficient control of a Boosting System with Multiple Variable-Speed Pumps in Parallel

Energy Efficient Control of a Boosting System with Multiple ...

引用

2010 49th IEEE Conference on Decision and control

作者： Zhenyu Yang Hakon Borsting Automation & Control Section Department of Electronic Systems Aalborg University Esbjerg Campus Niels Bohrs Vej 8 6700 Esbjerg Denmark Grundfos A/S 8850 Bjerringbor Denmark

ISBN: (纸本)9781424477456

The control objective of a water boosting system equipped with multiple variable-speed pumps in parallel is to minimize the pump system energy consumption by control the number of running pumps and their corresponding speeds in a real-time manner, subject to potential changes of (system head) set-points and operating conditions. After a number of static models for different pump combinations are derived, a number of optimal scheduling algorithms are proposed from a formulated Mixed Integer Non-Linear Program (MINLP) problem. The Branch and Bound method is employed to cope with the considered MINLP problem and the Lagrangian Multipliers method is used to handle the corresponding nonlinear programming within each iteration. In order to cope with potential modeling errors, a feedback control mechanism is introduced into the proposed framework. In case of unknown operating conditions, an identification algorithm is proposed to estimate unknown system coefficients in an online manner. The experimental results show a huge potential to improve the energy efficiency of multi-pump systems using the proposed method and algorithms.

关键词： Parallel Lines Energy efficiency Pumps Variable speed Branch and bound methods Pumping systems static models Operating conditions Boost iterative methods

来源：评论

学校读者我要写书评

暂无评论

Fault isolation for shipboard decision support

Fault isolation for shipboard decision support

引用

作者： Lajic, Zoran Blanke, Mogens Nielsen, Ulrik Dam Technical University of Denmark Department of Mechanical Engineering Section of Coastal Maritime and Structural Eng.Build. 403 2800-Kgs. Lyngby Denmark Technical University of Denmark Department of Electrical Engineering Automation and Control Group Build. 326 2800-Kgs. Lyngby Denmark Norwegian University of Technology and Science Centre for Ships and Ocean Structures 7491 Trondheim Norway

ISBN: (纸本)9783902661876

Fault detection and fault isolation for in-service decision support systems for marine surface vehicles will be presented in this paper. The stochastic wave elevation and the associated ship responses are modeled in the frequency domain. The paper takes as an example fault isolation of a containership on which a decision support system has been installed and it will be demonstrated that all the faults can be isolated. The paper shows how a shipboard decision support system could become highly reliable and comprise built-in supervision of the quality of the sensor signals that are crucial to the quality of decisions given to navigators. Copyright © 2010 IFAC.

关键词： Decision support systems

来源：评论

学校读者我要写书评

暂无评论

Frequency-domain generelaized singular peruturbation method for relative error model order reduction

引用

控制理论与应用（英文版） 2009年第1期7卷 57-62页

作者： Hamid Reza SHAKER Section for Automation and Control Institute for Electronic SystemsAalborg University

A new mixed method for relative error model order reduction is proposed. In the proposed method the frequency domain balanced stochastic truncation method is improved by applying the generalized singular perturbation method to the frequency domain balanced system in the reduction procedure. The frequency domain balanced stochastic truncation method, which was proposed in [15] and [17] by the author, is based on two recently developed methods, namely frequency domain balanced truncation within a desired frequency bound and inner-outer factorization techniques. The proposed method in ttiis paper is a carry over of the frequency-domain balanced stochastic truncation and is of interest for practical model order reduction because in this context it shows to keep the accuracy of the approximation as high as possible without sacrificing the computational efficiency and important system properties. It is shown that some important properties of the frequency domain stochastic balanced reduction technique are extended to the proposed reduction method by using the concept and properties of the reciprocal systems. Numerical results show the accuracy, simplicity and flexibility enhancement of the method.

关键词： Large-scale systems Model reduction Balanced realization Frequency-domain Grammian

来源：评论

学校读者我要写书评

暂无评论

Epidemic synchronization in robotic swarms

Epidemic synchronization in robotic swarms

引用

IFAC Workshop on Networked Robotics, NetRob09

作者： Schioler, Henrik Ngo, Trung Dung Dalsgaard, Jens Section for Automation and Control Centre for Embedded SW Systems Aalborg University Denmark Section for Automation and Control Dept. of Electronic Systems Aalborg University Denmark

ISBN: (纸本)9783902661531

Clock synchronization in swarms of networked mobile robots is studied in a probabilistic, epidemic framework. In this setting communication and synchonization is considered to be a randomized process, taking place at unplanned instants of geographical rendezvous between robots. In combination with a Markovian mobility model the synchronization process yields overall evolutionary dynamics for first and second conditional moments of synchronization error given geographical position. The established dynamics assume the shape of partial integro-differential equations and the swarm is subsequently studied as an infinite-dimensional optimal control problem. Illustrative numerical examples are given and commented. © 2009 IFAC.

关键词： Synchronization

来源：评论

学校读者我要写书评

暂无评论

Fault Isolation for Shipboard Decision Support

引用

IFAC Proceedings Volumes 2010年第16期43卷 413-418页

作者： Zoran Lajic Mogens Blanke Ulrik Dam Nielsen Technical University of Denmark Department of Mechanical Engineering Section of Coastal Maritime and Structural Eng.Build. 403 2800-Kgs. Lyngby Denmark Technical University of Denmark Department of Electrical Engineering Automation and Control Group Build. 326 2800-Kgs. Lyngby Denmark Norwegian University of Technology and Science Centre for Ships and Ocean Structures 7491 Trondheim Norway

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：