After the simulation of the well surrounded by two and three stratums, the two-dimensionalspectrum is calculated while the curve of wave slowness changes with the frequency is drawn.
分别计算了井外有两层、三层介质时井内声波传播的二维谱，绘制了时差随频率的变化曲线。
2
Method of two and Three dimensional holo spectrum plotted by MATLAB software is set forth.
并阐述了利用MAT - LAB软件绘制二维全息谱图和三维全息谱图的方法。
3
The analysis and research on the statistical method for two-dimensional random load spectrum of vehicle transmission are presented in this paper.