The noise sources represent the spectral density curves.
右图是噪声源所代表的频谱密度曲线。
The concept of "equivalent noisy power spectral density" is introduced in this paper.
文中提出等效噪声功率谱密度的概念。
Effects of the correlation time of noises on the spectral density also are discussed.
进一步又讨论了噪声的关联时间对原子激光谱密度的影响。
Then they were imported to MATLAB and calculated to obtain the power spectral density(PSD).
将数字声波信号导入MATLAB软件进行处理，得到其功率谱密度图。
The matrix of power spectral density function of fluctuating wind load is established first.
首先建立了脉动风荷载的功率谱密度函数矩阵。
The methods of computation and realization of signal power spectral density are mainly discussed.
文中主要描述了信号功率谱的计算和实现方法。
A novel method was proposed based on the total pressure of pitot tube and power spectral density.
通过分析皮托管动压信号的方式，提出了一种基于功率谱密度分布的调节阀扰动信号分析新方法。
Power spectral density is an effective tool to evaluate random vibration in circulation environment.
功率谱密度是评价流通环境过程中随机振动的有效工具。
A high degree of relationship was found between the power spectral density and thermal response index (TRI).
功率谱密度值与时域指标体温反应指数(TRI)有极好的相关性。
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。
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。
We analyse statistics properties of ground clutters and study AR model of correlated clutters power spectral density.
分析了地杂波统计特性，研究了相关雷达杂波功率谱特性的AR模型及其模拟方法。
The semi-analytical solution for evaluating ESR from spectral density function of wide-band random loading is presented.
提出了依据宽带随机谱功率密度函数求解等效应力幅的半解析公式。
The power spectral density function of ground acceleration can be described as filtered white noise applied on each support point.
地面运动加速度功率谱模型为零均值的平稳高斯过程，描述为过滤白噪声施加于支撑各点。
The power spectral density of gearbox vibration signals is estimated by the periodogram from which original feature sets are derived.
为解决该问题，提出了利用频域特征和遗传编程对齿轮箱盖多类状态振动信号进行特征提取的方法。
In practical application, one of the difficulties is the adjustment of the power spectral density function to various soil conditions.
在实际应用中，调整功率谱密度函数以适应各类场地土仍是一项困难的工作。
The experimental results of the different aperture parameters and the power spectral density of wavefront slope are derived in the paper.
本文推导了采用不同孔径参数的实验结果，以及波前斜率的功率谱密度。
Firstly, the power spectral density function of refractive index is given including the effects of inner and outer scale of the turbulence.
首先，给出了包含大气湍流内，外尺度效应的折射率功率谱密度函数。
The average spectral density functions under MAS condition were derived from various models of jump motion and models of freely diffusive motion.
根据不同的跃迁运动和自由扩散运动模型导出了魔角旋转条件下的平均谱密度函数。
With same input signal to excite two systems, the results show that the power spectral density of the output can't identify non-minimum phase signal.
用相同的激励信号作用，结果显示，功率谱密度无法分辨非最小相位信号。
They obey normal distributions. Distributions of power spectral density (PSD) for pressure signal display narrower frequency range and higher amplitude.
压力信号的功率谱密度具有频率波动范围窄、幅值大的特点；
Objective The power spectral density functions of outpatient flow are calculated in order to study the spectral characteristics of the given time series.
目的以门诊量资料为例，计算功率谱密度函数，研究时间序列信号的频率域特征。
The new definition of the beam propagation factor for partially coherent light is proposed through the propagation equations of the cross-spectral density.
并依据部分相干光的交叉光谱密度的傍轴传输方程，重新定义了普遍的部分相干光的传输因子。
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 influence of random signals on the power spectral density characteristic of switching function is studied and a practical design of randomized PWM is proposed.
分析了随机信号对开关函数功率谱密度特性的影响，据此提出随机脉宽调制技术的实用化设计方法。
The bridge was actuated by sinusoid sweeping frequency wave, and then the power spectral density differences between the undamaged and damaged bridge were analyzed.
利用正弦扫频波激振钢桥，分析其损伤前后加速度反应功率谱密度的变化。
The correlation between the standard classified road power spectral density (PSD) and international roughness index (IRI) was discussed by using regressive analysis.
通过回归分析的方法对标准分级道路功率谱密度与相应国际平整度指数之间的关系进行了研究。
The rock acoustic parameters in this paper include wave amplitude, spectral amplitude, spectral area, spectral density, wave velocity and attenuation coefficient etc.
这些岩石声学参数为波幅、谱幅、谱面积、谱密度、波速度、衰减系数等。
The results show that acoustic response feature of random vibration depends on the acoustic response function and the spectral density function of the stimulating load.
理论推导和实例结果表明，随机振动的声学响应特性取决于声学频率响应函数和激励谱密度函数。
The results show that acoustic response feature of random vibration depends on the acoustic response function and the spectral density function of the stimulating load.
理论推导和实例结果表明，随机振动的声学响应特性取决于声学频率响应函数和激励谱密度函数。
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