检索结果-内蒙古大学图书馆

Annual Conference of the IEEE Industrial Electronics Society

作者： K. Tungpimolrut S. Kachapornkul P. Jitkreeyarn P. Somsiri N. Chayopitak C. Akira Advanced Automation and Electronics Research Unit National Electronics and Computer Technology Center Dept. of Electrical and Electronics Engineering Tokyo Institute of Technology

ISBN: (纸本)9781479902255

This paper propose a torque performance improving method for the bipolar excitation using the commercial three-phase full bridge converter based Switched Reluctance Motor (SRM) motor drive system. In order to control the current in each phase more flexible without any coupled effect among phases, the 2 units or double standard three-phase full-bridge power modules are used. The concept of current command with superimposed DC offset for the bipolar excitation scheme of those double standard three-phase full-bridge converter bases SRM drive system is proposed for torque performance improvement. The relation between the current and generating torque based on the proposed excitation scheme and power circuit configuration is analyzed, and the condition for the maximum average torque is also determined. The proposed method is verified on 1.5 kW, 3-phase 6/4 pole SRM.

关键词： Switched Reluctance Motors Three-phase full bridge converter Bipolar excitation Torque capacity

来源：评论

学校读者我要写书评

暂无评论

Model Development for Motor Drive System Simulations

Model Development for Motor Drive System Simulations

引用

International Power Electronics Conference

作者： Hiroki Ishikawa Takashi Abe Toshiji Kato Yutaka Kubota Junichi Shimomura Yusuke Kohno Masahiro Ikeda Nobuhiro Umeda Noriyuki Kimura Koichi Shigematsu Yukinori Inoue Dept. of Electrical Electronic and Computer Engineering Gifu University Nagasaki University Doshisha University Mitsubishi Heavy Industries Ltd. Meidensha Corporation TOSHIBA CORPORATION Nagasaki Institute of Applied Science YASKAWA Electric Corporation Osaka Institute of Technology Cybernet Systems Co. Ltd. Osaka Prefecture University

ISBN: (纸本)9781479927067

In the motor drives working group of Cooperative Study Group on Applications of Power Electronics Simulations of IEEJ, standard models for simulation of motor drive systems are discussed. This paper provides a standard motor model of induction motor drive systems with parameters. Parameters of more than 30 induction motors have been gathered, and tendency of the parameters have been also investigated. In this paper, some simulation example are shown and compared with the experimental results.

关键词： Simulation Standard models Motor drive systems Induction motors

来源：评论

学校读者我要写书评

暂无评论

PREDICTION BASED FILTERING AND SMOOTHING TO EXPLOIT TEMPORAL DEPENDENCIES IN NMF

PREDICTION BASED FILTERING AND SMOOTHING TO EXPLOIT TEMPORAL...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Nasser Mohammadiha Paris Smaragdis Arne Leijon KTH Royal Institute of Technology Sound and Image Processing Lab Stockholm Sweden University of Illinois at Urbana-Champaign Dept. of Computer Science Dept. of Electrical and Computer Engineering Adobe Systems Inc.

ISBN: (纸本)9781479903573

Nonnegative matrix factorization is an appealing technique for many audio applications. However, in its basic form it does not use temporal structure, which is an important source of information in speech processing. In this paper, we propose NMF-based filtering and smoothing algorithms that are related to Kalman filtering and smoothing. While our prediction step is similar to that of Kalman filtering, we develop a multiplicative update step which is more convenient for nonnegative data analysis and in line with existing NMF literature. The proposed smoothing approach introduces an unavoidable processing delay, but the filtering algorithm does not and can be readily used for on-line applications. Our experiments using the proposed algorithms show a significant improvement over the baseline NMF approaches. In the case of speech denoising with factory noise at 0 dB input SNR, the smoothing algorithm outperforms NMF with 3.2 dB in SDR and around 0.5 MOS in PESQ, likewise source separation experiments result in improved performance due to taking advantage of the temporal regularities in speech.

关键词： Nonnegative matrix factorization (NMF) Probabilistic latent component analysis (PLCA) Prediction Temporal dependencies smoothing NMF protocol Filtration Kalman filtering Information source matrix decomposition Filtering algorithms Speech processing temporal structure Speech SDPR gene

来源：评论

学校读者我要写书评

暂无评论

Stability Analysis of a Wind Turbine Active Power Control System

Stability Analysis of a Wind Turbine Active Power Control Sy...

引用

American Control Conference

作者： Andrew Buckspan Lucy Pao Jacob Aho Paul Fleming Dept. of Electrical Computer and Energy Engineering University of Colorado Boulder Richard & Joy Dorf Professor in the Dept. of Electrical Computer and Energy Engineering University of Colorado Boulder National Renewable Energy Laboratory's National Wind Technology Center Boulder

ISBN: (纸本)9781479901777

Wind penetration levels have increased dramatically in recent years. This has motivated the need for wind turbines and wind plants to provide grid frequency regulation services. Wind turbines do not inherently provide frequency regulation services in the same manner as conventional synchronous generators because modern wind turbines are decoupled from the grid via their power electronics. Consequently, active power control (APC) must be performed to allow wind turbines to participate in grid frequency regulation. In this paper, we consider a wind turbine APC system, which uses a generator torque controller to operate in a derated manner, allowing the turbine to maintain overhead power. Derated operation is achieved by operating the turbine at a higher-than-optimal tip-speed ratio. We show the stability of the APC torque controller and the asymptotic stability of the derated operating points for a constant input. Further, the control system is shown to be input-to-state stable for time-varying inputs.

关键词： same APC Power Control System

来源：评论

学校读者我要写书评

暂无评论

Model-Based Dynamic Optimization with OpenModelica and CasADi

引用

IFAC Proceedings Volumes 2013年第21期46卷 446-451页

作者： Alachew Shitahun Vitalij Ruge Mahder Gebremedhin Bernhard Bachmann Lars Eriksson Joel Andersson Moritz Diehl Peter Fritzson PELAB-Programming Environment Lab Dept. Computer Science Linköping University SE-581 83 Linköping Sweden Dept. Mathematics and Engineering University of Applied Sciences D-33609 Bielefeld Germany Vehicular Systems Dept. Electrical Engineering Linköping University SE-581 83 Linköping Sweden Dept. of Electrical Engineering and Optimization in Engineering Center (OPTEC) K.U. Leuven Belgium

This paper demonstrates model-based dynamic optimization through the coupling of two open source tools: OpenModelica, which is a Modelica-based modeling and simulation platform, and CasADi, a framework for numerical optimization. The coupling uses a standardized XML format for exchange of differential-algebraic equations (DAE) models. OpenModelica supports export of models written in Modelica and the optimization language extension using this XML format, while CasADi supports import of models represented in this format. This allows users to define optimal control problems (OCP) using Modelica and optimization language specification, and solve the underlying model formulation using a range of optimization methods, including direct collocation and direct multiple shooting. The proposed solution has been tested on several industrially relevant optimal control problems, including a diesel-electric power train.

关键词： Modelica OpenModelica model-based optimization dynamic optimization CasADi

来源：评论

学校读者我要写书评

暂无评论

A Frequency-Domain Study on the Effect of DC-Link Decoupling Capacitors

A Frequency-Domain Study on the Effect of DC-Link Decoupling...

引用

IEEE Energy Conversion Congress and Exposition

作者： Zheng Chen Dushan Boroyevich Paolo Mattavelli Khai Ngo Center for Power Electronics Systems (CPES) The Bradley Dept. of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24061 USA

ISBN: (纸本)9781479903375

DC-link decoupling capacitors are generally placed near the power switches in the converter to minimize the parasitic ringing and voltage overshoot on the devices. In this paper, the influence of decoupling capacitors on the turn-off parasitic ringing of power MOSFETs is studied in the frequency domain based on a small-signal modeling approach. This new angle helps explain the effect of these capacitors in a simpler and more straightforward way compared to the traditional time-domain analysis, and provides a deeper insight into the problem. A rule of thumb about the selection of effective decoupling capacitance value can also be derived from this study.

关键词： decoupling capacitor Power Switch DC link voltage overshoot small-signal girdling Converters Power MESFETs

来源：评论

学校读者我要写书评

暂无评论

electrical characteristics of Pt Schottky contacts on AlInN:Mg/GaN heterostructures

Electrical characteristics of Pt Schottky contacts on AlInN:...

引用

作者： Kim, Seongjun Kim, Hee Jin Choi, Suk Ryou, Jae-Hyun Dupuis, Russell D. Ahn, Kwang-Soon Kim, Hyunsoo School of Semiconductor and Chemical Engineering Semiconductor Physics Research Center Chonbuk National University Jeonju Chonbuk 561-756 Korea Republic of Center for Compound Semiconductors and School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Dept. of Mechanical Engineering and Texas Center for Superconductivity at the University of Houston University of Houston Houston TX 77204 United States School of Chemical Engineering Yeungnam University Gyeongsan Gyeongbuk 712-749 Korea Republic of

The electrical characteristics of Pt Schottky contacts on AlInN:Mg/GaN heterostructures were investigated. A barrier inhomogeneity model applied to temperature-dependent forward current-voltage (I-V) curves revealed the mean barrier height of 1.67 eV and the standard deviation of 0.22 eV. The reverse leakage current could be understood in terms of the Poole-Frenkel emission model, yielding the emission barrier height of 0.26 eV and the high-frequency relative dielectric permittivity of 5.32. On the basis of these obtained values, the continuum of electronic states could be predicted to locate 1.41 eV below the valence band. © 2013 The Japan Society of Applied Physics.

关键词： Permittivity

来源：评论

学校读者我要写书评

暂无评论

Transfer Learning across Networks for Collective Classification

Transfer Learning across Networks for Collective Classificat...

引用

IEEE International Conference on Data Mining (ICDM)

作者： Meng Fang Jie Yin Xingquan Zhu Centre for Quantum Computation & Intelligent Systems University of Technology Sydney Australia Computational Informatics CSIRO Australia Dept. of Computer & Electrical Engineering and Computer Science Florida Atlantic University USA

ISBN: (纸本)9781479913282

This paper addresses the problem of transferring useful knowledge from a source network to predict node labels in a newly formed target network. While existing transfer learning research has primarily focused on vector-based data, in which the instances are assumed to be independent and identically distributed, how to effectively transfer knowledge across different information networks has not been well studied, mainly because networks may have their distinct node features and link relationships between nodes. In this paper, we propose a new transfer learning algorithm that attempts to transfer common latent structure features across the source and target networks. The proposed algorithm discovers these latent features by constructing label propagation matrices in the source and target networks, and mapping them into a shared latent feature space. The latent features capture common structure patterns shared by two networks, and serve as domain-independent features to be transferred between networks. Together with domain-dependent node features, we thereafter propose an iterative classification algorithm that leverages label correlations to predict node labels in the target network. Experiments on real-world networks demonstrate that our proposed algorithm can successfully achieve knowledge transfer between networks to help improve the accuracy of classifying nodes in the target network.

关键词： Subspace constraints Knowledge engineering Prediction algorithms Convergence Optimization Iterative methods Knowledge transfer

来源：评论

学校读者我要写书评

暂无评论

Toward a consensus in protein structure nomenclature

引用

Intrinsically disordered proteins 2014年第1期2卷 e970902页

作者： Linder C DaSilva Thomas Gurry Collin M Stultz Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA ICET-CUAl Federal University of Mato Grosso Barra do Garças Brazil. Computational and Systems Biology Initiative Cambridge MA USA. Dept. of Electrical Engineering and Computer Science & Institute for Medical Engineering and Sciences

In a recent article, published in , a valuable consensus view regarding the nomenclature for disordered proteins was presented. In this work the authors present a thoughtful and systemic review of terms that have been used in the literature to describe proteins that sample a heterogeneous set of structures during their biological lifetime. We agree that the term "intrinsically disordered proteins" (IDPs) is an appropriate single descriptor to refer to this particular class of proteins, although it does not fully capture much of the nuanced complexities that are inherent to this class. In what follows we suggest a refinement to this nomenclature based on an analysis of the underlying ensemble that describes the thermally accessible states of a given IDP.

关键词： intrinsically disordered proteins nomenclature order parameter secondary structure

来源：评论

学校读者我要写书评

暂无评论

Towards a large-scale, optical timing distribution system with sub-femtosecond residual timing jitter

Towards a large-scale, optical timing distribution system wi...

引用

2013 Joint European Frequency and Time Forum and International Frequency Control Symposium, EFTF/IFC 2013

作者： Peng, Michael Y. Callahan, Patrick T. Nejadmalayeri, Amir H. Kartner, Franz X. Roberts, Tony D. Battle, Philip Valente, Stefano Ahmed, Kemal Xin, Ming Monberg, Eric Yan, Man Gruner-Nielsen, Lars Fini, John M. Dept. of Electrical Engineering and Computer Science Research Laboratory for Electronics Massachusetts Institute of Technology Cambridge MA United States AdvR Inc. Bozeman MT United States Center for Free-Electron Laser Science Deutsches Elektronen-Synchrotron Hamburg Germany OFS Laboratories Somerset NJ United States

ISBN: (纸本)9781479903429

We present here key technologies for an all-optical timing distribution system with sub-femtosecond precision. Timing distribution over a 1.2-km polarization-maintaining, fiber-optic link using balanced optical cross-correlators (BOC) for link stabilization was demonstrated for 16 days with 0.6 fs RMS timing drift and during a 3-day interval only 0.13 fs drift. Jitter characterization of two identical commercial femtosecond lasers using the BOC method verified sub-100-as timing jitter for frequencies above than 1 kHz. Preliminary operation of a fiber-coupled, hybrid-integrated BOC using periodically-poled KTiOPO4 (PPKTP) waveguides indicate great potential for improved BOC timing sensitivities and overall system efficiency and robustness. © 2013 IEEE.

关键词： Optical fibers

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：