... power series method 幂级数法 power spectral density method 光谱密度法 power-series expansion method 幂级数展开的方法 ...
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The random rail roughness samples are yielded using random numerical method and power spectral density function.
采用随机数值模拟方法和功率谱密度函数生成随机轨道粗糙度。
The calculation results using simulated and measured irregularity indicate that the power spectral density function and the simulated method used here can reflect true condition of rail.
同时，采用模拟与实测两种不平顺样本的计算结果表明，本文采用功率谱密度函数的模拟方法可以基本反映轨道的实际不平顺情况。
Aiming at this problem, an effective method based on FFT and power spectral density computing has been put forward.
针对此问题，笔者提出了一种基于快速傅立叶变换和功率谱密度计算的解决方法。
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