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Yingying Yao,Yong-Kwon Choi,Chang-Seop Koh 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.4
This paper presents a useful and simple method to design the passive shimming system for homogeneous permanent magnets based on numerical optimization. To simulate the effects of manufacturing and assembling tolerances, the actual geometrical parameter of the magnet with a derivation is suggested. Then, the optimal design model of a passive shim system is set up to correct the derivative of field homogeneity. The numbers, sizes and locations of the passive shims are optimized by the steepest descent algorithm combined with design sensitivity analysis. Two implementations show that the proposed method can achieve the r'equired homogeneity of the field with the minimum quantity of ferromagnetics.
Yao, Yingying,Li, Wei,Yoon, Hee-Sung,Fujiwara, Koji,Koh, Chang-Seop The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.3
For taking account of the two-dimensional magnetic properties of a grain-oriented electrical steel sheet, the effective anisotropic tensor reluctivity is examined, and a computationally efficient algorithm is suggested by using the response surface method to model the two-dimensional magnetic properties. It is shown that the reconstructed two-dimensional magnetic properties are fairly effective to stabilize the convergence characteristics of the Newton-Raphson iteration in the nonlinear magnetic field analysis.
A Global Optimization Algorithm Based on <tex> $C^{1}$</tex> Piecewise Response Surface Patches
Yingying Yao,Chang Seop Koh,Shiyou Yang,Guangzheng Ni IEEE 2007 IEEE transactions on magnetics Vol.43 No.4
<P>A new surrogate objective function is suggested for the global optimization of electromagnetic devices. The surrogate objective function is constructed using a C<SUP>1</SUP> piecewise response surface incorporated with the design sensitivities computed by using the finite-element method. The sampling data points used for constructing the response surface are adaptively inserted during the optimization process. After the surrogate objective function is constructed, the global optimum point is obtained by using a genetic algorithm. Applications to benchmark problems and the optimum design of a permanent magnet system show the effectiveness of the proposed algorithm</P>
Yao, Yingying,Choi, Yong-Kwon,Koh, Chang-Seop The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.4
This paper presents a useful and simple method to design the passive skimming system for homogeneous permanent magnets based on numerical optimization. To simulate the effects of manufacturing and assembling tolerances, the actual geometrical parameter of the magnet with a derivation is suggested. Then, the optimal design model oi a passive shim system is set up to correct the derivative of field homogeneity. The numbers, sizes and locations of the passive shims are optimized by the steepest descent algorithm combined with design sensitivity analysis. Two implementations show that the proposed method can achieve the required homogeneity of the field with the minimum quantity of ferromagnetics.
Yingying Yao,Wei Li,Hee Sung Yoon,Koji Fujiwara,Chang Seop Koh 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.3
For taking account of the two-dimensional magnetic properties of a grain-oriented electrical steel sheet, the effective anisotropic tensor reluctivity is examined, and a computationally efficient algorithm is suggested by using the response surface method to model the two-dimensional magnetic properties. It is shown that the reconstructed two-dimensional magnetic properties are fairly effective to stabilize the convergence characteristics of the Newton-Raphson iteration in the nonlinear magnetic field analysis.
Yao, Yingying,Eum, Young Hwan,Koji Fujiwara,Koh, Chang Seop 충북대학교 컴퓨터정보통신연구소 2007 컴퓨터정보통신연구 Vol.15 No.3
For taking account of the two-dimensional magnetic properties of a grain-oriented electrical steel sheet, the effective anisotropic tensor reluctivity is examined, and a computationally efficient algorithm is suggested by using response surface method to model the two-dimensional magnetic properties. It is shown that the reconstructed two-dimensional magnetic properties are fairly effective to stabilize the convergence characteristics of the Newton-Raphson iteration in the nonlinear magnetic field analysis.
3-D nonlinear transient eddy current calculation of online power transformer under DC bias
Yao, Yingying,Koh, Chang Seop,Ni, Guangzheng,Xie, Dexin IEEE 2005 IEEE transactions on magnetics Vol.41 No.5
This paper presents a new method to analyze the three-dimensional (3-D) nonlinear transient eddy currents and losses of an online transformer in a power system under direct current bias. In the method, power system simulation is incorporated with 3-D field computation to obtain the magnetic parameters and the equivalent exciting source of the online transformer.