... multiplier 乘数，乘法器 oscillatory 振荡的 frequency density function 频率密度函数 Fourier series 傅立叶级数 Spectrum 频谱 ...
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the time-domain frequency density function 时频密度函数
double frequency spectral density function [电子] 双重频率谱密度函数
frequency-time spectral density function 频率时间谱密度函数
The loads and the distribution of stress amplitude frequency are obtained by cycle count and reliable data for fatigue design are provided by probability density function fit.
用循环计数法求出载荷及应力幅频率分布，用概率密度函数拟合，为疲劳设计提供可靠性高的数据资。
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。
B solution, the function of wave attenuation, wave frequency and plasma density is deduced.
解，推导出电磁波能量衰减与电磁波频率和等离子体密度的关系式。
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