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Design of small-scale gradient coils in magnetic resonance imaging by using the topology optimization method
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作者 Hui Pan Feng Jia +3 位作者 Zhen-Yu Liu Maxim Zaitsev Juergen Hennig Jan G Korvink 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第5期91-100,共10页
A topology optimization method based on the solid isotropic material with penalization interpolation scheme is utilized for designing gradient coils for use in magnetic resonance microscopy.Unlike the popular stream f... A topology optimization method based on the solid isotropic material with penalization interpolation scheme is utilized for designing gradient coils for use in magnetic resonance microscopy.Unlike the popular stream function method,the proposed method has design variables that are the distribution of conductive material.A voltage-driven transverse gradient coil is proposed to be used as micro-scale magnetic resonance imaging(MRI)gradient coils,thus avoiding introducing a coil-winding pattern and simplifying the coil configuration.The proposed method avoids post-processing errors that occur when the continuous current density is approximated by discrete wires in the stream function approach.The feasibility and accuracy of the method are verified through designing the z-gradient and y-gradient coils on a cylindrical surface.Numerical design results show that the proposed method can provide a new coil layout in a compact design space. 展开更多
关键词 topology optimization method gradient coils solid isotropic material with penalization magnetic resonance imaging
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The ICM method with objective function transformed by variable discrete condition for continuum structure 被引量:20
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作者 Yunkang Sui Xirong Peng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2006年第1期68-75,共8页
ICM (Independent Continuous Mapping) method can solve topological optimization problems with the minimized weight as the objective and subjected to displacement constraints. To get a clearer topological configuratio... ICM (Independent Continuous Mapping) method can solve topological optimization problems with the minimized weight as the objective and subjected to displacement constraints. To get a clearer topological configuration, by introducing the discrete condition of topological variables and integrating with the original objective, an optimal model with multi-objectives is formulated to make the topological variables approach 0 or 1 as near as possible, and the model reduces the effect of deleting rate on the result. The image-filtering method is employed to eliminate the checkerboard patterns and mesh dependence that occurred in the topology optimization of a continuum structure. The computational efficiency is enhanced through selecting quasi-active displacement constraints and a design region. Numerical examples indicate that this algorithm is robust and practicable, though the number of iterations is slightly increased with respect to the original algorithm. 展开更多
关键词 Structural topological optimization ICM method Checkerboard patterns Mesh dependence Thedeleting rate
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NEW HMM ALGORITHM FOR TOPOLOGY OPTIMIZATION 被引量:4
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作者 Zuo Kongtian ZhaoYudong +2 位作者 Chen Liping Zhong Yifang Huang Yuying 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2005年第3期346-350,共5页
A new hybrid MMA-MGCMMA (HMM) algorithm for solving topology optimization problems is presented. This algorithm combines the method of moving asymptotes (MMA) algorithm and the modified globally convergent version... A new hybrid MMA-MGCMMA (HMM) algorithm for solving topology optimization problems is presented. This algorithm combines the method of moving asymptotes (MMA) algorithm and the modified globally convergent version of the method of moving asymptotes (MGCMMA) algorithm in the optimization process. This algorithm preserves the advantages of both MMA and MGCMMA. The optimizer is switched from MMA to MGCMMA automatically, depending on the numerical oscillation value existing in the calculation. This algorithm can improve calculation efficiency and accelerate convergence compared with simplex MMA or MGCMMA algorithms, which is proven with an example. 展开更多
关键词 Topology optimization method of moving asymptotes (MMA) Modified globally convergent version of MMA (MGCMMA) HMM algorithm Convergence
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Topology optimization of support structure of telescope skin based on bit-matrix representation NSGA-II 被引量:7
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作者 Liu Weidong Zhu Hua +3 位作者 Wang Yiping Zhou Shengqiang Bai Yalei Zhao Chunsheng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2013年第6期1422-1429,共8页
Non-dominated sorting genetic algorithm II(NSGA-II)with multiple constraints handling is employed for multi-objective optimization of the topological structure of telescope skin,in which a bit-matrix is used as the ... Non-dominated sorting genetic algorithm II(NSGA-II)with multiple constraints handling is employed for multi-objective optimization of the topological structure of telescope skin,in which a bit-matrix is used as the representation of a chromosome,and genetic algorithm(GA)operators are introduced based on the matrix.Objectives including mass,in-plane performance,and out-of-plane load-bearing ability of the individuals are obtained by fnite element analysis(FEA)using ANSYS,and the matrix-based optimization algorithm is realized in MATLAB by handling multiple constraints such as structural connectivity and in-plane strain requirements.Feasible confgurations of the support structure are achieved.The results confrm that the matrix-based NSGA-II with multiple constraints handling provides an effective method for two-dimensional multi-objective topology optimization. 展开更多
关键词 Bit-matrix representation Finite element method Flexible skin Matrix-based NSGA-II Structural optimization Topology optimization
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