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检索条件"主题词=iteration algorithm"

共 144 条记录，以下是91-100 订阅

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Wireless Power and Information Transfer system with Full Bridges Based on Multi-frequency Programmed PWM 22

Wireless Power and Information Transfer system with Full Bri...

引用

22nd International Conference on Electrical Machines and Systems (ICEMS)

作者： Wu, Jie Li, Yuegong Jin, Nan Deng, Wei Bie, Lizhong He, Shuaibiao Zhang, Hengyi Zhang, Zhiwei Zhengzhou Univ Light Ind Dept Elect Engn Zhengzhou Peoples R China Ohio State Univ Dept Elect & Comp Engn Columbus OH 43210 USA

ISBN: (纸本)9781728133980

With the development of power electronics, wireless power transfer (WPT) technology has been widely used in many fields because of its convenience and safety. In this paper, a multi-frequency wireless power and information transfer system with common inductive coils is proposed by using the multi-frequency programmed pulse width modulation (MFPWM) technology, which applies double modules to realize the power and data transmission with a single full-bridge inverter. The performances of the power and data transfer, as well as the principles of the control strategy are analyzed in detail. It shows that the power and data can share a pair of common couple coil and a single inverter. A simulation model is designed to verify the effectiveness of the proposed method and structure. The system demonstrates stability and feasibility under this control strategy.

关键词： WPT Full-bridge MFPWM iteration algorithm

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Iterative Maximum Likelihood Estimation for Time and Integer Frequency Offset in OFDM Systems

<bold>Iterative Maximum Likelihood Estimation for Time and I...

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8th International Conference on Signal Processing

作者： Nan, Lv Zheng Hui, Zhao Xiao Jilin Univ Lab Informat Sci 55 Nanhu Campus Changchun 130012 Peoples R China Lab Informatique Paris 6 F-75015 Paris France

ISBN: (纸本)9780780397361

In this paper the problem of integer frequency offset and time synchronization for orthogonal frequency division multiplexing (OFDM) systems is considered. An improved algorithm for time and integer frequency offset estimation is derived based on maximum likelihood (ML) technique and the differential information between two consecutive data symbols under the AWGN channel. In this algorithm, an iterative technique is used to obtain the estimation of time and normalized integer frequency offset when conducting global maximum of log-likelihood and calculating initial seed.

关键词： OFDM maximum likelihood estimation integer frequency offset iteration algorithm

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A General Efficient Design Method for Optimum Nonuniform Array Pattern Synthesis

A General Efficient Design Method for Optimum Nonuniform Arr...

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IEEE Radar Conference (RadarConf)

作者： Liu, Ruitao Wang, Bing Wei, Wenqiang Yu, Xianxiang Cui, Guolong Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu 611731 Peoples R China Sci & Technol Elect Informat Control Lab Chengdu 610036 Peoples R China

ISBN: (纸本)9781665436694

This paper focuses on the research of a general optimization framework applying to the placement of both two types of nonuniform arrays, thinned array (TA) and sparse array (SA). We introduce the optimization problems that aim to minimize array factor (AF) peak sidelobe level (PSLL), also involving a number of practical constraints. To tackle the resultant non-convex optimization problems, we propose a modified iterative coordinate descent (MICD) method to split original problems into multiple independent one-dimensional subproblems. In each iteration, the redundant calculation is removed to improve the efficiency of the algorithm. Finally, numerical simulations are provided to verify the effectiveness of the proposed method.

关键词： Array factor iteration algorithm nonuniform array sparse array thinned array

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Reference Signal Detection for Voltage Harmonic Damping in Three-Phase Systems 18

Reference Signal Detection for Voltage Harmonic Damping in T...

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18th International Conference on Computational Problems of Electrical Engineering (CPEE)

作者： Tobola, Andrzej Mikolajuk, Kazimierz Warsaw Univ Technol Dept Elect Engn Warsaw Poland

ISBN: (纸本)9781538610404

Two cases are considered: harmonic reduction and unbalanced load correction. The paper presents the method of reference signal detection for shunt active power filter control. The parallel filter used for the voltage shape improving in three-phase four wire systems is considered. The signal is detected from voltage harmonics. The method uses the state observer acting in frequency domain. The process needs a few steps of iteration to obtain a compensator current reducing voltage harmonics. The numerical observer acting simultaneously with the system has learning features.

关键词： Active power filters detection of voltage harmonics iteration algorithm

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A distributed optimization algorithm for multi-agent systems with limited communication 32

A distributed optimization algorithm for multi-agent systems...

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32nd Chinese Control And Decision Conference (CCDC)

作者： Li, Tai-Fang Li, Huan Bohai Univ Coll Engn Jinzhou 121013 Peoples R China

ISBN: (纸本)9781728158556

In distributed optimization of multi-agent systems, agents usually cooperate to minimize a global function which is a sum of local objective functions. In this paper, distributed optimization of multi-agent systems is studied in which the global function is in a general form. A communication rule and a distributed algorithm are designed to solve the cooperative optimization problem of multi-agent systems with limited communication which is embodied by an undirected graph. The algorithm is designed according to the proposed communication rule which can share global information indirectly by transmitting information among the agents even though communications among the agents are limited, and is carried out through the true values of agents' states instead of the estimated ones. A simulation example of distributed optimization of a four-agent system with limited communication is presented to show the effectiveness of the proposed algorithm.

关键词： Distributed optimization Multi-agent systems Communication constraints iteration algorithm

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Multi-sensor Distributed Estimation Fusion Based on Minimizing the Bhattacharyya Distance Sum 24

Multi-sensor Distributed Estimation Fusion Based on Minimizi...

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24th IEEE International Conference on Information Fusion (FUSION)

作者： Tang, Qi Duan, Zhansheng Xi An Jiao Tong Univ Ctr Informat Engn Sci Res Xian 710049 Shaanxi Peoples R China

ISBN: (纸本)9781737749714

In multi-sensor distributed estimation fusion, local estimation errors are generally correlated among local estimates. Usually, correlation is known to exist but unavailable or unclear to be how large it is, and needed to be considered. For this situation, a sensible way is to set up an optimality criterion and optimize it over all possible such correlations. Based on the framework of minimizing the statistical distance sum between the fused density and local posterior densities, a new method is proposed by utilizing Bhattacharyya distance, which is commonly used in measuring the closeness or similarity between two densities. First, the objective function is introduced. Then, we investigate the convexity form of the objective function, and separate the solving procedure into two steps during settling the original optimization problem, which benefit us to acquire the solution of that problem. At last, the acquired solution (fused estimate) is given in an implicit form, however, it can be obtained through iterative algorithm. And, it is pessimistic definite in mean square error (MSE). Numerical examples illustrate this and show the effectiveness of the proposed distributed method by comparing with several other fusion methods under the same framework but using other kinds of statistical distance.

关键词： Distributed estimation fusion statistical distance Bhattacharyya distance Gaussian assumption iteration algorithm

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An axisymmetric model of the heat and mass transfer in electrical contacts during short arc 68

An axisymmetric model of the heat and mass transfer in elect...

引用

68th IEEE Holm Conference on Electrical Contacts (HOLM)

作者： Kharin, S. N. Inst Math & Math Modeling Alma Ata Kazakhstan

ISBN: (纸本)9798350342468

The mathematical model has been developed that describes the dynamics of the temperature field in electrical contacts when they are heated by the heat flux of a short arc, which is considered to be multicomponent and dependent on the temperature of the arc and the contact spot. For the cathode, these components take into account ionic bombardment of the cathode, radiant heating by arc column, heating due to the emission of the reverse electrons, thermal emission cooling and power losses due to phase transitions. The power supplied to the anode includes heating due to the kinetic energy of the entering electrons and radiant heating by the arc column, and cooling for the consume of phase transformations. The model is based on the spherical Stefan problem with nonlinear boundary conditions and a special coefficient that takes into account a part of the ejected liquid melt. To solve it, an iterative method of majorant functions has been developed, which makes it possible to obtain sequences of overestimated and underestimated temperatures in the liquid and solid zones of the contact area, as well as the corresponding values of the erosion values.

关键词： electrical contacts arc erosion components of heat fluxes mathematical modeling ejection coefficient iteration algorithm

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Numerical Solution of Dynamic Measurement Problem by Volterra Polynomials 2

Numerical Solution of Dynamic Measurement Problem by Volterr...

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2nd International Ural Conference on Measurements (UralCon)

作者： Solodusha, S. Orlova, I. Melentiev Energy Syst Inst SB RAS Irkutsk Russia Irkutsk State Tech Univ Irkutsk Russia

ISBN: (纸本)9781538605219

The paper demonstrates the possibility of the Newton-Kantorovich method application to numerically solve the Volterra polynomial integral equations of the first kind. The specific features of the studied nonlinear equations make it possible to specify an initial approximation for the iteration process represented by solving the respective Volterra linear equations of the first kind. The method convergence is illustrated on the model equations of the second and third degrees. The paper presents the specific features of the numerically solved studied equations with a fixed length of a mantissa in the machine representation of a floating-point number. The practical part of the research is concerned with the application of the developed algorithms for the measurement of a blade lean of a horizontal-axis wind turbine with a synchronous generator.

关键词： nonlinear dynamic systems Volterra polynomials iteration algorithm numerical solution MAPLE

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MRAS Sensorless Control of the SynRM Based on a Simplified Finite Position Set algorithm 14

MRAS Sensorless Control of the SynRM Based on a Simplified F...

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14th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

作者： Eftekhari, S. Rasul Mosallanejad, Ali Pairo, Hamidreza Shahid Beheshti Univ Fac Elect Engn Tehran Iran Niroo Res Inst Elect Machines Res Grp Tehran Iran

ISBN: (纸本)9798350336641

Model reference adaptive system (MRAS) is one of the most popular methods in encoder less drive control applications due to its simple implementation. In the conventional MRAS method, there is a proportional-integral (PI) controller which estimates the motor speed by zeroing the error of the adaptive and the reference model. This method has problems such as pure integration effects and tuning the PI controller parameters at different operating points. This paper presents a MRAS speed estimator method based on a simplified finite position set iteration algorithm for a synchronous reluctance motor (SynRM). This method is inspired by the finite control set model predictive control (FCS-MPC) method, which calculates the optimal angle of the rotor by minimizing a cost function for a limited number of the rotor position in every sampling time. By using the proposed iteration algorithm, in addition to solving the problems caused by the PI controller in the conventional method, due to having low iterations compared to the algorithms of the other methods, it applies a minimal computational load to the microcontroller. The performance of the suggested method for SynRM in a wide range of speeds is simulated in MATLAB software.

关键词： sensorless control MRAS mrthod iteration algorithm synchronous reluctance motor

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A Vector Matrix Iterative Self-Organizing Assistant Clustering algorithm of XML Document

A Vector Matrix Iterative Self-Organizing Assistant Clusteri...

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9th International Conference for Young Computer Scientists

作者： Liu, Bo Yang, LuMing Deng, Yunlong Cent S Univ Coll Informat Sci & Engn Changsha 410083 Peoples R China IIunan Agr Univ Informat Sci & Technol Coll Changsha 410083 Peoples R China Cent S Univ Xiangya Hosp 3 Changsha 410013 Peoples R China

ISBN: (纸本)9781424441983

To improve the clustering quality of massive extensible mark-up language (XML) document clustering, this paper proposes a vector matrix iterative self-organizing assistant clustering algorithm of XML document(VMISACAX). The algorithm bases on the XML key, and transforms XML document into vector matrix, then carries out the optimizations of canceling, dissociating and uniting etc. In order to improve the convergence of the algorithm, a assistant strategy is imported to shorten the algorithm time under settling for clustering, to obtain best result of clustering by XML key's weights, but it doesn't always obtain the maximum distance's target of matrix vector clustering. Contrasted with other vector clustering algorithms, a series of emulation experiments show that this algorithm has proper the effectiveness and feasibility.

关键词： XML key Vector Matrix Weight Clustering iteration algorithm

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