We describe an accurate periodic boundary condition （PBC） called the symmetric PBC in the calculation of the magnetostatie interaction field in the finite-differentiation-method fast-Fourier-transform （FDM-FFT） mi...We describe an accurate periodic boundary condition （PBC） called the symmetric PBC in the calculation of the magnetostatie interaction field in the finite-differentiation-method fast-Fourier-transform （FDM-FFT） micromagneties. The micromagnetic cells in the regular mesh used by the FDM-FFT method are finite-sized elements, but not geometrical points. Therefore, the key PBC operations for FDM-FFT methods are splitting and relocating the micromagnetic cell surfaces to stay symmetrically inside the box of half-total sizes with respect to the origin. The properties of the demagnetizing matrix of the split micromagnetic cells are discussed, and the sum rules of demagnetizing matrix are fulfilled by the symmetric PBC.展开更多
提出一种基于Z Y NQ硬件平台的信息分析与处理方法,实现在硬件平台上对未知信号的精确分析与处理.设计基于FFT算法对信号进行频谱分析,提取其主要频率分量,依据频谱分析结果设计对应的FIR数字滤波器,达到精确滤波的目的.仿真实验结果表...提出一种基于Z Y NQ硬件平台的信息分析与处理方法,实现在硬件平台上对未知信号的精确分析与处理.设计基于FFT算法对信号进行频谱分析,提取其主要频率分量,依据频谱分析结果设计对应的FIR数字滤波器,达到精确滤波的目的.仿真实验结果表明,本设计可有效过滤干扰波,完全达到了设计要求.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 51171086 and 51371101
文摘We describe an accurate periodic boundary condition （PBC） called the symmetric PBC in the calculation of the magnetostatie interaction field in the finite-differentiation-method fast-Fourier-transform （FDM-FFT） micromagneties. The micromagnetic cells in the regular mesh used by the FDM-FFT method are finite-sized elements, but not geometrical points. Therefore, the key PBC operations for FDM-FFT methods are splitting and relocating the micromagnetic cell surfaces to stay symmetrically inside the box of half-total sizes with respect to the origin. The properties of the demagnetizing matrix of the split micromagnetic cells are discussed, and the sum rules of demagnetizing matrix are fulfilled by the symmetric PBC.
