检索结果-内蒙古大学图书馆

International Conference on Telecommunications Energy (INTELEC)

作者： Sang-Taek Lee Hee-Jun Kim Dae-Kyong Kim Kwang-Woon Lee Dept. of Electronics Electrical Control and Instrumentation Engineering Hanyang Univ. Korea Digital Convergence Center Korea Electronics Technology Institute Korea School of Electrical Engineering and Computer Science Hanyang Univ. Korea Division of Maritime Electronics and Communication Engineering Mokpo National Maritime Univ. Korea

ISBN: (纸本)9781424424900

This paper presents a novel load variation compensation algorithm in a sensor-less BLDC motor drive for a reciprocating compressor. Periodic load variation of a reciprocating compressor leads to commutation position error and instantaneous speed variation and causes large peak currents. The major concept of this study includes tracking the pattern of load torque and controlling the motor input voltage by the commutation point and PWM depending on the tracked load torque. The suggested method can reduce the cost because this method does not require additional current sensing or voltage comparison circuit. The utility of the suggested algorithm was confirmed by simulation and experimental results of a sensor-less BLDC motor drive.

关键词： Load management Brushless DC motors Torque Commutation Pistons Voltage control Refrigeration Rotors Home appliances Force control

来源：评论

学校读者我要写书评

暂无评论

A safety assessment methodology for a digital reactor protection system

引用

International Journal of control, Automation and Systems 2006年第1期4卷 105-112页

作者： Lee, Dong-Young Choi, Jong-Gyun Lyou, Joon Instrumentation and Control - Human Factors Div. Korea Atomic Energy Research Institute 150 Deogjin-dong Yuseong-gu Daejeon 305-353 Korea Republic of Dept. of Electrical and Computer Engineering Chungnam National University 220 Gung-dong Yuseong-gu Daejeon 305-764 Korea Republic of Korea Atomic Energy Research Institute Department of Electrical and Computer Engineering Chungnam National University

The main function of a reactor protection system is to maintain the reactor core integrity and the reactor coolant system pressure boundary. Generally, the reactor protection system adopts the 2-out-of-m redundant architecture to assure a reliable operation. This paper describes the safety assessment of a digital reactor protection system using the fault tree analysis technique. The fault tree technique can be expressed in terms of combinations of the basic event failures such as the random hardware failures, common cause failures, operator errors, and the fault tolerance mechanisms implemented in the reactor protection system. In this paper, a prediction method of the hardware failure rate is suggested for a digital reactor protection system, and applied to the reactor protection system being developed in Korea to identify design weak points from a safety point of view.

关键词： Digital devices

来源：评论

学校读者我要写书评

暂无评论

Visual pattern recognition using morphological methods

Visual pattern recognition using morphological methods

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： I.N.M. Papadakis J.G. Reisman S.C.A. Thomopoulos Dept. of Electr. & Comput. Eng. Pennsylvania State Univ. University Park PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

An effective method for visual pattern recognition using morphological techniques is presented. It is shown that it can be successfully used for the recognition of deformed letters. The method extracts morphological information by the successive dilation of an idealized letter set. At each stage a properly defined similarity index is computed. The maximum values of the similarity index for each stored letter are compared and are used for the classification decision. Classification results are presented for a set of deformed capital English letters with a realistic level of deformation. Skeletonization of the deformed pattern is shown to improve the performance of the classification method. The described method can be easily implemented using a parallel architecture.< >

关键词： Pattern recognition Artificial neural networks Feature extraction Clocks control systems Laboratories Data mining Parallel architectures Character recognition Tiles

来源：评论

学校读者我要写书评

暂无评论

State Space Grids for Low Complexity Abstractions

State Space Grids for Low Complexity Abstractions

引用

IEEE Annual Conference on Decision and control

作者： Matthias Rungger Alexander Weber Gunther Reissig Department of Electrical and Computer Engineering at the Technische Universitat Munchen 80333 Munich Germany University of the Federal Armed Forces Munich Dept. Aerospace Eng. Chair of Control Eng. (LRT-15) D-85577 Neubiberg (Munich) Germany

ISBN: (纸本)9781479978878

We consider an automated, algorithmic controller synthesis framework for perturbed nonlinear control systems to enforce complex specifications, in which an auxiliary transition system, also known as abstraction or symbolic model, is used as a finite substitute of the original control system in the controller design process. We specifically focus on reducing the computational effort to obtain abstractions, which is the most expensive step in the approach. To this end, we derive a functional to estimate the size of the abstraction, specifically, the number of transitions, and prove that after a suitable transformation the functional becomes strongly convex. Thus, the minimization of the estimated size of the abstraction is an unconstrained strongly convex optimization problem, which is straightforward to solve using standard methods. This permits us to use this functional as a heuristic to determine certain grid parameters for the construction of abstractions. We illustrate the benefits of the newly developed heuristic for two numerical examples.

关键词： Abstraction Heuristics FUNCTIONALS control systems design process state space Nonlinear control systems

来源：评论

学校读者我要写书评

暂无评论

Pursuit-Evasion on a Sphere and When It Can Be Considered Flat

arXiv

引用

arXiv 2024年

作者： Milutinović, Dejan Von Moll, Alexander Manyam, Satyanarayana G. Casbeer, David W. Weintraub, Isaac E. Pachter, Meir Electrical and Computer Engineering Dept. University of California Santa Cruz Santa CruzCA United States The Control Science Center Aerospace Systems Directorate Air Force Research Laboratory DaytonOH45435 United States DCS Corporation DaytonOH United States Dept. of Electrical Engineering Air Force Institute of Technology Wright-Patterson AFB OH United States

In classical works on a planar differential pursuit-evasion game with a faster pursuer, the intercept point resulting from the equilibrium strategies lies on the Apollonius circle. This property was exploited for the construction of the equilibrium strategies for two faster pursuers against one evader. Extensions for planar multiple-pursuer single-evader scenarios have been considered. We study a pursuit-evasion game on a sphere and the relation of the equilibrium intercept point to the Apollonius domain on the sphere. The domain is a generalization of the planar Apollonius circle set. We find a condition resulting in the intercept point belonging to the Apollonius domain, which is the characteristic of the planar game solution. Finally, we use this characteristic to discuss pursuit and evasion strategies in the context of two pursuers and a single slower evader on the sphere and illustrate it using numerical *** Codes 58E10, 86A30, 37D40, 91A23, 49L12, 49Q10 © 2024, CC BY-NC-ND.

关键词： Spheres

来源：评论

学校读者我要写书评

暂无评论

Isolated/non-isolated quad-inverter configuration for multilevel symmetrical/asymmetrical dual six-phase star-winding converter

Isolated/non-isolated quad-inverter configuration for multil...

引用

IEEE International Symposium on Industrial Electronics (ISIE)

作者： Sanjeevikumar Padmanaban Michael R. Hontz Raghav Khanna Patrick William Wheeler Frede Blaabjerg Joseph Olorunfemi Ojo Power Electronics Division Ohm Technologies Chennai India Electrical Engineering & Computer Science Dept. University of Toledo Toledo Ohio USA Power Electronics Machines and Control Group (PEMC) Nottingham University UK Center for Reliable Power Electronics (CORPE) Aalborg University Denmark University of KwaZulu-Natal Durban South Africa Dept. of Electrical & Computer Engg. Tennessee Technological University USA

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and `More-Electric Aircraft' propulsion systems.

关键词： Inverters Windings Standards Switches Modulation Reliability Capacitors

来源：评论

学校读者我要写书评

暂无评论

Approach Lighting System Lightning Mitigation and Individual control Cabinet Protection

Approach Lighting System Lightning Mitigation and Individual...

引用

Annual North-American Power Symposium

作者： James A. Momoh Nadir Wade Arunsi Chuku Lateef L. Baruwa Center for Energy Systems and Control CESaC Howard University College of Medicine Washington D.C. DC USA Center for Energy Systems and Control (CESaC) Howard University Washington DC USA Center for Energy Systems and Control CESaC Department of Electrical and Computer Engineering ECE Howard University College of Medicine USA Dept. of Electrical and Computer Engineering (ECE) Howard University. Air Traffic Systems Division Federal Aviation Administration (FAA) Washington DC USA

The mitigation of the impact of lightning and the individual control cabinet (ICC) protection of an approach lighting system (ALS) against over-voltage is the focus of this paper. It is the objective of this paper to evaluate three proposed ALS topologies and select the grounding configuration which optimally mitigates the high voltage and current levels caused by lightning, as well as to assess the over-voltage reduction capability of a metal-oxide varistor and its ability to provide protection to the individual control cabinet to prevent damage. Simulation of the grounding system of each ALS topology using a sensitivity study, which incorporates changes in conductor and environmental characteristics, is performed to determine the robustness of each ALS topology. Performance of a hands-on destructive test is also carried out to obtain practical results to compare with simulation results. This paper provides the foundation for improving the current ALS grounding and protective measures by updating standards and specifications to promote increased reliability and safety, as well as reduced equipment cost.

关键词： Lightning Lighting control control systems Protection Topology Grounding Varistors Optimal control Voltage control Conductors

来源：评论

学校读者我要写书评

暂无评论

Investigation of Plasmon Propagation on Lossy Dielectric Split Ring Resonator, DSRR, Chain over Semiconductor Substrates: Simulations in the tens of Terahertz Range

Investigation of Plasmon Propagation on Lossy Dielectric Spl...

引用

Asia-Pacific Microwave Conference

作者： M. Sabrera S. E. Barbin L. C. Kretly Dept. of Communications DECOM School of Electrical and Computer Engineering FEEC University of Campinas UNICAMP Dept. of Telecommunications and Control Engineering Polytechnic School EPUSP-University of Sao Paulo

ISBN: (纸本)9781479987689

In general, a magnetic plasmon propagation along a chain of connected Single-Split Ring Resonators (SRR) is obtained using metallic cells over a dielectric substrate. This work presents some kind of a "dual" chain, i.e., a dielectric SRR matrix over non-perfect conductors such as semiconductors. For both materials, dielectric SRR cells and substrates, conductive loss is considered. This new configuration at micro and nano scale cells presents -as simulation reveals- a "dielectric" plasmon response in the range of tens of Terahertz.

关键词： Dielectric Plasmon propagation Dielectric resonators SRR PMMA P3HT E-Beam

来源：评论

学校读者我要写书评

暂无评论

Design and Simulation of Ultrasonic Linear Motor using Multilayer Ceramic Actuator

Design and Simulation of Ultrasonic Linear Motor using Multi...

引用

IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Juhyun Yoo Sangho Lee Jaeil Hong Hyunsun Song Durkwon Park Eunsang Hwang Department of Electrical Engineering Semyung University Chungbuk South Korea Department of Computer Science Semyung University Chungbuk South Korea Dept. of Electrical Information Control Dongseoul College Seongnam Gyeonggi 461-714 Korea Semyung University Department of Computer Science Jechon Chungbuk 390-711 Korea

In comparison with conventional electromagnetic motors, ultrasonic motors have many advantages such as a large torque at the low velocity, good controllability, rapid response, quiet operation, simple structure and non electromagnetic field induction, etc. These features have led to the development of various ultrasonic motors in many industrial fields. Hence, in this study, ultrasonic linear motor using multilayer structured ceramic actuator was designed and simulated using ANSYS of finite element method(FEM) simulator for investigating the optimum conditions of it. The ultrasonic linear motor studied in this paper was designed using the 1st longitudinal (L 1 ) and 4th bending (B 4 ) vibration. The size of ceramic actuator is 15 mm long and 5 mm wide. And one-layer thickness of actuator is 60 mu m. The dimension of linear motor is 61 times 5 times 3 mm. The sectional size of projection is 1.5 times 5 mm. The driving voltage of the motor was very low as 5 Vrms. With the increase of the number of piezoelectric ceramic layers, displacement of node was increased up to 21 layered ceramic actuator and then decreased. Maximum z displacement of node was about 7.02 mum at the 21 layered ultrasonic motor.

关键词： Nonhomogeneous media Ceramics Hydraulic actuators Electromagnetic fields Induction motors Electromagnetic induction controllability Finite element methods Voltage Piezoelectric actuators

来源：评论

学校读者我要写书评

暂无评论

Conditions for Robust D-Stability of Discrete-Delay Perturbed Singular Systems

引用

Journal of Systems engineering and Electronics 2001年第2期000卷

作者： Wang Ruliang Liu Yongqing Guangxi Normal College Dept. of Automatic Control Engineering， South China Univ. of Tech.

In this paper, a sufficient condition of robust D-stability for discrete-delay perturbed singular systems is presented, and the robust stability sufficient condition is independent of the delay. Two classes of perturbations for systems are discussed: (1) highly structured parametric perturbations; (2) unstructured parametric perturbations. An useful technique for robust pole-assignment in a specified circular region is also proposed, the criterion is tested easily,and convenient for the application in the engineering. Two examples have been given to validate the proposed method.

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：