power density spectrum

Power spectrum density estimation.

功率谱密度估计.

Power spectrum density ( PSD ) analysis is a popular method in heart rate variability ( HRV ) analysis.

功率谱分析 是目前心率 变异性 分析的主要方法.

By the area auto-correlation function and power spectrum density function, the texture characteristic of C/ C composite is analyzed.

采用二维自相关函数和功率谱密度函数分析了C/C复合材料切削表面形貌的纹理特征，表明：C/C复合材料铣削表面纹理是各向同性的。

Through analyzing random vibration, we obtained the response power spectrum of converter cabinet and also used power spectrum density method to analyze vibration fatigue life of the converter cabinet.

通过随机振动分析获得变流器柜的响应功率谱，采用功率谱密度函数法分析变流器柜振动疲劳寿命。

And the effects of heat flux on power spectrum density function of the pressure fluctuations are stressed study, and the flow regime transitions is correlation to number and frequency of the main peak value of power spectrum density function.

热流密度的变化对多相沸腾系统的功率谱密度函数有一定的影响，且功率谱密度函数的主峰个数及第一主峰的起始频率能反映出流型的变化规律。