power spectrum density

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.

However, the transmission distance of UWB is only from meters to more than ten meters according to the quite low transmission power spectrum density.

但是，较低的发射功率谱密度导致UWB信号的传输距离只有几米到十几米。

Power spectrum density estimation.

功率谱密度估计.

The power spectrum density of roughness and the contact area filter character is analyzed.

对轮轨粗糙度谱和轮轨接触区域的滤波特性进行了分析。

At the same time the correlation function and power spectrum density are been analyzed, at last the correlation compound K-distribution stochastic sequences whose covariance matrix is been given are been generated through SIRP algorithm.

同时对海杂波的相关函数和功率谱进行了分析，最后使用SIRP算法产生了给定协方差矩阵的相关复合K-分布随机序列。

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。

Stochastic irregularity power spectrum density ( PSD) data surveyed from high accuracy rocket sled test track is interpolated with B-spline to gain PSD average curves for curve fitting.

对实测高精度火箭橇试验轨道随机不平顺功率谱密度（PSD）进行B样条插值，得到拟合用PSD平均曲线。

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。

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。

The method does not need filtering and can sample directly from the power spectrum density function of the irregularity of railway track and be appliable for stationary and nonstationary railway irregularities.

这种方法不需要进行滤波，直接对轨道不平顺的功率谱密度函数进行采样处理，对平稳的及非平稳的轨道不平顺均可应用。

Finally, finite element and dynamic substructure method for VFD model are applied to dynamic response calculation of SMR. Power spectrum density of SMR grain response is obtained under random excitation of trapezium acceleration power spectrum density.

将VFD模型有限元法和模态综合法用于发动机响应计算，得到了梯形谱随机激振作用下发动机药柱响应的功率谱密度，它集中在一个窄带频域内，形成共振尖峰。