Kelvin wave systems generated by the high-speed displacement-type ships are computed using Rankine source panel method. The far-field wake waves can be then determined numerically by wave amplitude spectrums obtained through Fourier transform of the corresponding calculated nearfield waves. Two ways of wave pattern analysis, transverse-cut method and longitudinal-cut method,to derive wave amplitude spectrums are discussed. Examples of numerical simulation for far-field wake waves are presented and comparisons of calculated results between these two methods are made.%以Rankine源面元法数值计算排水型高速船舶的兴波问题,得到船舶附近水域的Kelvin波系.对近域计算得到的波浪要素进行Fourier变换,推算波幅谱函数,进而可获得大范围的远域尾浪的数值模拟结果.探讨了利用波形分析中的纵切法或横切法推算波幅谱函数的两种方法,给出了它们在高速船远域尾浪数值模拟问题中的应用算例.
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