检索结果-内蒙古大学图书馆

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Wei Xue Xiaoniu Yang Zhaoyang Zhang Department of Information Science and Electronic Engineering Zhejiang Uinversity Hangzhou Zhejiang China National Laboratory of Information Control Technology for Communication System Jiaxing Zhejiang China Dept. of Inf. Sci. & Electron. Eng. Zhejiang Uinversity Hangzhou China

The carrier recovery is one key technique in the demodulation of high order quadrature amplitude modulation (QAM) signals. A carrier recovery algorithm which switches between multi-threshold polarity decision mode and decision directed mode according to the standard deviation of the frequency of numerically controlled oscillator (NCO) is proposed. The proposed algorithm can detect a proper time for the mode switch to yield lower steady state error. The simulation results demonstrate the effectiveness of the proposed algorithm in improving the performance of blind carrier recovery.

关键词： Phase locked loops Quadrature amplitude modulation Steady-state Detectors Signal processing algorithms Constellation diagram Simulation

来源：评论

学校读者我要写书评

暂无评论

Fault detection and isolation in current and voltage sensors of doubly-fed induction generators

引用

IFAC Proceedings Volumes 2009年第8期42卷 1360-1365页

作者： Manuel Gálvez-Carrillo Michel Kinnaert Dept. of Control Engineering and System Analysis Université Libre de Bruxelles (ULB) 1050 Brussels Belgium

A fault detection and isolation (FDI) system for monitoring the stator current and voltage sensors of a doubly-fed induction generator (DFIG) for wind energy applications is presented. The FDI system is based on the model of the balanced three-phase signals, that is used to design a residual generator resting on the so-called Generalized Observer Scheme (GOS). Next, a decision system made of a combination of vector CUSUM (Cumulative Sum) algorithms is used in order to process the residual vector and achieve detection and isolation of incipient additive faults. The approach is validated via simulations of the DFIG controlled by a Linear Quadratic Gaussian (LQG) regulator.

关键词： Fault detection and isolation detector performance sensor failures electrical machines induction generators renewable energy systems Kalman filters state-space models

来源：评论

学校读者我要写书评

暂无评论

Space vector modulation for four-switch rectifier with compensating the effect of capacitors voltage ripple

Space vector modulation for four-switch rectifier with compe...

引用

2009 International Conference on Electric Power and Energy Conversion systems, EPECS 2009

作者： Ounie, S. Zolghadri, M.R. Center of Excellence in Power System Management and Control Dept. of Electrical Engineering Sharif University of Technology Iran

ISBN: (纸本)9789948427155

A space vector modulation (SVM) approach is proposed to control a four-switch rectifier with power factor correction and compensating the effect of capacitors voltage ripple. The theory and performance of this method are presented, and the method effectiveness is demonstrated by extensive simulations. The simulation results show that the capacitor voltage ripple effects in the output voltage and current shaping can be omitted and the rectifier can work agreeably under high power factor condition although capacitors voltage is not balance. The allowable amount of this unbalanced value of filter capacitors is determined.

关键词： Electric rectifiers

来源：评论

学校读者我要写书评

暂无评论

A sensorless vector control of induction motor drives based on artificial neural networks

A sensorless vector control of induction motor drives based ...

引用

作者： Barambones, Oscar Dept. of Automatic Control and System Engineering University of the Basque Country EUI Nieves cano 12 Vitoria Spain

ISBN: (纸本)9783902661463

This paper presents a speed control of an induction motor. The design uses an feedforward Artificial Neural Network (ANN) to implement a rotor speed estimator, and a robust control strategy based on the sliding-mode. The proposed control scheme also make use of the field oriented control theory to simplify the proposed control design. The stability analysis of the presented control scheme is provided using the Lyapunov stability theory. Finally simulated results show that the presented controller with the proposed observer provides high-performance dynamic characteristics and that this scheme is robust with respect to plant parameter variations and external load disturbances. © 2009 IFAC.

关键词： Vector control (Electric machinery)

来源：评论

学校读者我要写书评

暂无评论

Optimizing hybrid control trajectories by model abstraction and refinement

Optimizing hybrid control trajectories by model abstraction ...

引用

作者： Paschedag, Tina Fall, Michael Stursberg, Olaf Institute of Control and System Theory Dept. of Electrical Engineering and Computer Science University of Kassel Germany Technische Universität München Germany

ISBN: (纸本)9783902661593

Techniques for optimal control of hybrid systems have to consider the complex interaction of continuous and discrete dynamics and are required to limit the computational complexity arising from the corresponding search spaces. This contribution proposes an approach to computing hybrid optimal control trajectories based on an iterative model-abstraction and refinement scheme. The hybrid automaton is mapped to an abstract representation which is enriched by cost information gained from graph. Candidate solutions are computed on the abstract level and are mapped back to the level of the hybrid model, where they are validated. A refinement step guides the search for (sub-) optimal hybrid control trajectories. The proposed approach is implemented for the optimization of the start-up procedure for a chemical reactor.

关键词： Hybrid systems

来源：评论

学校读者我要写书评

暂无评论

State resetting for bumpless switching in supervisory control 10

State resetting for bumpless switching in supervisory contro...

引用

2009 10th European control Conference, ECC 2009

作者： Kinnaert, Michel Delwiche, Thomas Yame, Joseph Dept. of Control Engineering and System Analysis Université Libre de Bruxelles 50 Av. F. D. Roosevelt BrusselsB-1050 Belgium CRAN-UMR 7039 CNRS Université Henri Poincaré Nancy i Vandoeuvre-les-NancyF-54506 France

ISBN: (纸本)9783952417393

In this paper the realization and implementation of a multi-controller scheme made of a finite set of linear single-input-single-output controllers, possibly having different state dimensions, is studied. The supervisory control framework is considered, namely a minimal parameter dependent realization of the set of controllers such that all controllers share the same state space is used. A specific state resetting strategy based on the behavioral approach to system theory is developed in order to master the transient upon controller switching. © 2009 EUCA.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

DTI data modeling for unlimited query support

DTI data modeling for unlimited query support

引用

Medical Imaging 2009: Advanced PACS-based Imaging Informatics and Therapeutic Applications

作者： Siadat, Mohammad-Reza Hammad, Rafat Shetty, Anil Soltanian-Zadeh, Hamid Sethi, Ishwar Eetemadi, Ameen Elisevich, Kost Dept. of Computer Science and Engineering Oakland University Rochester MI 48309 United States Radiology Image Analysis Lab. Henry Ford Health System Detroit MI 48202 United States Department of Radiology William Beaumont Hospital Royal Oak MI 48073 United States Electrical and Computer Engineering Dept. University of Tehran Tehran 14395 Iran Dept. of Neurosurgery Henry Ford Health System Detroit MI 48202 United States

ISBN: (纸本)9780819475152

This paper describes Data Modeling for unstructured data of Diffusion Tensor Imaging (DTI). Data Modeling is an essential first step for data preparation in any data management and data mining procedure. Conventional Entity- Relational (E-R) data modeling is lossy, irreproducible, and time-consuming especially when dealing with unstructured image data associated with complex systems like the human brain. We propose a methodological framework for more objective E-R data modeling with unlimited query support by eliminating the structured content-dependent metadata associated with the unstructured data. The proposed method is applied to DTI data and a minimum system is implemented accordingly. Eventually supported with navigation, data fusion, and feature extraction modules, the proposed system provides a content-based support environment (C-BASE). Such an environment facilitates an unlimited query support with a reproducible and efficient database schema. Switching between different modalities of data, while confining the feature extractors within the object(s) of interest, we supply anatomically specific query results. The price of such a scheme is relatively large storage and in some cases high computational cost. The data modeling and its mathematical framework, behind the scene of query executions and the user interface of the system are presented in this paper. © 2009 SPIE.

关键词： Tensors

来源：评论

学校读者我要写书评

暂无评论

A signal-based approach for detection and isolation of current sensor faults in induction motors

A signal-based approach for detection and isolation of curre...

引用

European Conference on Power Electronics and Applications

作者： Manuel Gaalvez-Carrillo Michel Kinnaert Universite Libre de Bruxelles Bruxelles Bruxelles BE Dept. of Control Engineering and System Analysis Universite Libre de Bruxelles (ULB) Brussels Belgium

Incipient fault detection and isolation (FDI) in the current sensors of a controlled induction motor is addressed by an original diagnosis system based exclusively on the three-phase signals model. In this way we avoid a reduction in the performance of the FDI system due to the uncertainty in the machine model. Assuming that the three current signals are measured, the proposed FDI system is made of a combination of Kalman filters and statistical change detection and isolation algorithms (CUSUM or Cumulative Sum). The approach is validated by a closed-loop simulation using a squirrel cage induction motor. The latter is controlled by a linear quadratic regulator combined with an extended Kalman filter.

关键词： Signal detection Fault detection Induction motors Sensor systems Stators Fault diagnosis Optimal control Sensor phenomena and characterization Signal generators control system synthesis

来源：评论

学校读者我要写书评

暂无评论

Design of a static output feedback controller for bilateral teleoperation 9th

Design of a static output feedback controller for bilateral ...

引用

9th IFAC Symposium on Robot control, SYROCO 2009

作者： Delwiche, Thomas Aberkane, Samir Catoire, Laurent Torfs, Serge Kinnaert, Michel Dept. of Control Engineering and System Analysis Université Libre de Bruxelles CP 165/55 50 Av. F. D. Roosevelt BrusselsB-1050 Belgium CRAN-UMR 7039 CNRS Université Henri Poincaré Nancy I Vandoeuvre-les-NancyF-54506 France

ISBN: (纸本)9781617825583

Traditional H∞ design methods available in commercial softwares lead to controllers which present the same order as the model of the plant. Considering the high order of teleoperation systems, implementing such controllers may require the use of order-reduction methods. To avoid this extra step in the design, we propose to produce fixed-order controllers directly based on a full-order model of the system. In this paper, a zero-order (static output feedback) controller is designed for a teleoperation system. The design procedure, based on a cone complementary formulation is described and applied to a 22nd-order model of the system. The resulting controller is implemented on a one degree of freedom teleoperation system. The experimental results obtained with this simple control structure validate the use of very low order control structures in the case of teleoperation systems with the extra advantage, with respect to conventional H∞ design techniques, that the involved and time-consuming order reduction step is avoided.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

Induced L2-norm minimization of glucose-insulin system for type i diabetic patients

Induced L2-norm minimization of glucose-insulin system for t...

引用

作者： Kovács, Levente Kulcsár, Balázs Benyó, Balázs Benyó, Zoltán Budapest University of Technology and Economics Dept. of Control Engineering and Information Technology Magyar tudósok krt. 2 Budapest H-1117 Hungary Technical University of Delf Delft Center for System and Control Delft 2628CD Netherlands

ISBN: (纸本)9783902661494

Using induced L2-norm minimization, a robust controller was developed for insulin delivery in Type I diabetic patients. The high-complexity nonlinear diabetic patient Sorensen-model was considered and Linear Parameter Varying methodology was used to develop open loop model and robust controller. Considering the normoglycemic set point (81.1 mg/dL), a polytopic set was created over the physiologic boundaries of the glucose-insulin interaction of the Sorensen-model. In this way, Linear Parameter Varying model formalism was defined. The robust control was developed considering input and output multiplicative uncertainties with two additional uncertainties from those used in the literature: sensor noise and worst case design for meal disturbance (60 g carbohydrate). © 2009 IFAC.

关键词： Robust control

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：