relative frequency density 相对次数密度 Frequency-Power Density Domain 能量密度 frequency-time spectral density function 频率时间谱密度函数 ..
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The power spectral density function of earthquake motion is usually used for the random response analysis of engineering structures in the frequency domain.
工程结构的随机地震反应分析，常在频域中用到地震动的功率谱密度函数。
The use of Fourier analysis techniques to measure the wavefront power spectral density (PSD) in mid frequency domain is discussed.
波前功率谱密度 （PSD）被用于评价惯性约束聚变激光驱动器光学元件在中频区域的波前误差。
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