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Dive into the research topics where Yang Shiyou is active.

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Featured researches published by Yang Shiyou.


IEEE Transactions on Magnetics | 1996

Combined strategy of improved simulated annealing and genetic algorithm for inverse problem

Tang Renyuan; Yang Shiyou; Li Yan; Wen Geng; Mei Tiemin

A combined strategy of an improved simulated annealing (SA) algorithm and genetic algorithm is presented, with the goal of reducing the computational expenses. The improvements made on the SA algorithm include two parts, i.e., the adaptive regulating for the step vector, and the dynamic testing for the equilibrium of the Metropolis process. The proposed strategy has both the advantage of SA algorithm, the ability to avoid being trapped in a local optimum, and that of genetic algorithm, the ability to use the information about the searched states for the next iteration. A practical application on geometry optimization of pole shoes in large salient pole synchronous generators is effectively implemented using the strategy. The numerical results show that the number of iterations used by executing the combined strategy are only about 75% of those by executing basic SA algorithm.


IEEE Transactions on Magnetics | 2001

An improved genetic algorithm for global optimization of electromagnetic problems

Chen Xudong; Qian Jingen; Ni Guangzheng; Yang Shiyou; Zhang Mingliu

An improved genetic algorithm (GA) for design optimization of electromagnetic devices is developed in this paper. Numerical test is done on a classical mathematical problem, and it shows that the proposed method has noticeable advantages over standard GAs. To demonstrate its applicability in engineering optimal design problems, the proposed algorithm, together with the charge simulation method, is used to solve the optimization of a bar-plane electrode model.


Computer Methods in Applied Mechanics and Engineering | 2001

A common Tabu search algorithm for the global optimization of engineering problems

José Márcio Machado; Yang Shiyou; S.L. Ho; Ni Peihong

Abstract A novel common Tabu algorithm for global optimizations of engineering problems is presented. The robustness and efficiency of the presented method are evaluated by using standard mathematical functions and by solving a practical engineering problem. The numerical results show that the proposed method is (i) superior to the conventional Tabu search algorithm in robustness, and (ii) superior to the simulated annealing algorithm in efficiency.


IEEE Transactions on Magnetics | 1998

A universal tabu search algorithm for global optimization of multimodal functions with continuous variables in electromagnetics

Yang Shiyou; Ni Guangzheng; Li Yan; Tian Baoxia; Li Ronglin

A universal tabu search algorithm for the optimization of functions with continuous variables is presented based on the tabu method so far used, Essentially, the improvements include the transition criterion for different states, the determination of the step vector, the cancellation of tabu list, the stop criteria, and the restart from the optimum, etc. The numerical performances of the present algorithm are investigated using a benchmark problem and the geometry optimization of the multisection arc pole shoe in large salient pole synchronous generators.


Finite Elements in Analysis and Design | 2003

The application of interpolating MLS approximations to the analysis of MHD flows

Sérgio Luis Lopes Verardi; José Márcio Machado; Yang Shiyou

The element-free Galerkin method (EFGM) is a very attractive technique for solutions of partial differential equations, since it makes use of nodal point configurations which do not require a mesh. Therefore, it differs from FEM-like approaches by avoiding the need of meshing, a very demanding task for complicated geometry problems. However, the imposition of boundary conditions is not straightforward, since the EFGM is based on moving-least-squares (MLS) approximations which are not necessarily interpolants. This feature requires, for instance, the introduction of modified functionals with additional unknown parameters such as Lagrange multipliers, a serious drawback which leads to poor conditionings of the matrix equations. In this paper, an interpolatory formulation for MLS approximants is presented: it allows the direct introduction of boundary conditions, reducing the processing time and improving the condition numbers. The formulation is applied to the study of two-dimensional magnetohydrodynamic flow problems, and the computed results confirm the accuracy and correctness of the proposed formulation.


IEEE Transactions on Magnetics | 1990

Computation of transient electromagnetic torque in a turbogenerator under the cases of different sudden short circuits

Tang Renyuan; Hu Yan; Lu Zhanhong; Yang Shiyou; Miao Lijie

A method for the computation of the transient electromagnetic torque in turbogenerators is given in which the iron saturation and the relative motion of the rotor and stator are taken into account. This method is based on the finite-element computation using a dynamic model coupled with the equations of external electric circuits. To avoid the airgap mesh distortion caused by the movement of the rotor, moving boundaries are introduced in the airgap. An example is given that involves the computation of the distribution of transient magnetic field and the electromagnetic torque of a 200-MW turbo-generator following different types of sudden short-circuits. The computed results agree with the measurements very well. >


IEEE Transactions on Magnetics | 1998

Wavelet-Galerkin method for computations of electromagnetic fields

Yang Shiyou; Ni Guangzheng; Qian Jingen; Li Ronglin

A general wavelet-Galerkin method for the numerical computation of electromagnetic fields of bounded regions involving multimedia and an efficient approach to handle arbitrary boundary conditions are presented in this paper. The numerical results indicate that the present method is a strong contender to the well established finite element method.


IEEE Transactions on Magnetics | 2002

An improved tabu algorithm applied to global optimizations of inverse problems in electromagnetics

Chen Xudong; Ni Guangzheng; Yang Shiyou

This paper proposes an improved tabu search algorithm for global optimizations of multimodal functions with continuous variables of inverse problems in electromagnetics. The improvements include the introduction of a multistart process, the new neighborhood generating mechanism, and the memorization of the previously searched subspaces as well as the stop criteria for different termination purposes. The numerical results on solving a mathematical test function reveal that the proposed method is more robust in finding the global optimum compared with other kinds of tabu search algorithms. The shape optimization of an electrode demonstrates its value in practical engineering.


IEEE Transactions on Magnetics | 1997

Shape optimization of pole shoes in harmonic exciting synchronous generators using a stochastic algorithm

Yang Shiyou; Ni Guangzheng; Li Yan; Tang Renyuan

The optimization of pole shoes in harmonic exciting synchronous generators is effectively performed using the combined strategy of improved simulated annealing and genetic algorithms with some new improvements made in this paper. The improvements include a rule for the generation of new states, an adaptive regulation schedule for the length of the interval of the pseudo-random parameter and the addition of geometrical constraints. Numerical results on different machines reveal that the iterative number used by executing the combined strategy with improvements is only about 50% of that used by executing the original method, whilst that the optimization results obtained using different algorithms are nearly the same.


international conference on electrical machines and systems | 2005

Negative sequence eddy current field analysis of a 1055 MVA turbogenerator by using 3D finite element methods

Dong Jianyang; Liang Xubiao; Lin Feng; Yang Shiyou; Ni Guangzheng

The 3D negative sequence currents arising from unbalance system operations in large turbogenerators are studied by using the finite element method. The mathematical models of the three dimensional negative sequence eddy current fields of large turbogenerators considering the flexible slots are firstly proposed. To emulate the distributed exciting sources of the negative sequence current fields with enough precisions, the geometrical complication of the stator are accurately modeled in the proposed solid models, making it be readily to take into account of practical distributions of the negative sequence exciting currents. And finally, the negative sequence eddy current fields of a 1055 MVA turbogenerator are studied extensively by using numerical simulation results

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Li Yan

North China Electric Power University

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Tang Renyuan

Shenyang University of Technology

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S.L. Ho

Hong Kong Polytechnic University

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M. F. de Godoy

Faculdade de Medicina de São José do Rio Preto

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