基于现代信号处理中的高分辨率谱估计方法,对用时域有限差分方法计算二维声子晶体能带的迭代过程所输出的数据序列做后处理.数值仿真结果表明,相对于基于Fourier变换的后处理方法,该后处理方法在保证对二维声子晶体本征频率的精确估算的同时,能明显减少时域有限差分方法的迭代步数.
Based on the high-resolution spectral estimation method in modern signal processing, a postprocessing method is proposed to analyze the data series, which are generated during the iterations of the finite difference time domain (FDTD) method used to calculate the energy bands of two-dimensional (2D) phononic crystal. Numerical simulation results show that, compared with the postprocessing method based on Fourier transform, the proposed postprocessing method can reduce the number of iterations of the FDTD method significantly while yielding precise estimation of the eigenfrequencies of the 2D phononic crystal at the same time.
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