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A method of cross power spectral density between responses is derived and a poly reference modal analysis method using cross power spectral density method in frequency domain is presented in this paper.

对各测点响应的互功率谱密度函数进行了详细推导，提出了一种基于互功率谱密度的频域多参点辨识法，这意味着许多原本利用频响函数的传统频域识别法可以很容易地用于工作状态下的模态识别，大大开阔了未知激励下模态识别的视野。

The system has realized signal generator, signal"s sampling and averaging function, signal"s power spectral density and cross special density analysis, the design and application of digital filter, signal analysis in time, frequency and inverted frequency domain.

实现了波形发生器的设计、信号采集及平均处理、滤波器的设计及应用、信号的时域、频域以及倒频域分析。

PSD method for identifying cross power spectral density of distributed excitation force is discussed by calculating cross power spectral density of measured response.

功率谱密度函数识别法则是以系统反应之交叉功率谱密度函数识别外力之交叉功率谱密度函数。

Here is a standard of crowdedness. In Japan, when the standing density in a car is 4～6 person/m2, people will accept it easily; when it comes to 6～8 person/m2, people still think it normal. But when the density is 9～12 person/m2, people would complain the "crowdedness".

以拥挤度为例，日本的地铁拥挤度标准提出：当站位密度为4～6人/m2时，这样的拥挤度认为是"可以接受的"；当站位密度为6～8人/m2时，尚属"正常状况"；当站位密度为9～12人/m2时，就达到了"拥挤状况"。

The proper planting density should be 1 m × 0.3 m and 0.3 m × 0.3 m for land under broadleaf crown and shady droughty land respectively. If the havelock equipment in field was used, seedlings with 15-20 cm for height and 0.30 cm for diameter should be selected for cultivation, with the density and transmittance being 0.3 cm × 0.3 cm and 50% respectively.

林冠下栽植和山垅旱地造林的适宜密度分别为1 m×0.3 m和0.3 m×0.3 m；若利用农田庇荫设施栽培，应选用苗高15~20 cm，地径0.30 cm以上规格的苗木栽植，栽植密度为0.3 m×0.3 m，遮阳透光率在50%左右。

Nearest M—C bond. Comparing the covalent electron density of MC with NiAl at different crystal planes, it is found that the electron density along the interface (110)_//(100)_ ...

通过对NiAl和MC的不同晶面的共价电子密度的分析发现：(110 ) NiAl和(10 0 ) MC在一级近似范围内基本上保持连续；采取适当的制备工艺，使复合材料中存在尽可能多的(110 ) NiAl//(10 0 ) MC，有可能使这种复合材料具有更优异的力学性能

Low density polyethylene has a crystallinity range of 65 percent, and high density polyethylene of 85 percent.

定语从句中的省略。定语从句中的省略。

Soil with 1.2 g/cm3 bulk density was most favorable for the plant height and root growth of cucumber plants,and soil with 1.4 g/cm3 bulk density was most favorable for the stem thickness,yield and nutrient uptake of cucumber plants under this experiment conditions.

在本试验条件下，容重为1.2.g/cm3的土壤利于株高及根系的生长，容重1.4g/cm3的土壤则利于茎粗、根系养分的吸收及产量的增加。

Proper combinations of number of outcomes, discrete step size, and scaling of the random variable, the discrete cumulate percentage distribution and discrete percentage density will converge to the continuous cumulative probability distribution and probability density function respectively.

适当之出现或试验次数或取样数量、散化阶梯大小、随机变数缩放比例可使离散累积百分比分布及离散百分比密度趋近于连续的累积机率分布及机率密度函数。

The characteristic function of the probability density function of response variable is obtained by the high efficient multidimensional numerical integration method or convolution integral based on response surface method. Then the discrete probability density function of response variable is calculated using the fast Fourier inverse transform technique, at last the cumulative distribution function of the response variable can be quantitatively determined.

首先利用高效多维数值积分方法或基于响应面法的卷积积分求解功能函数的分布函数的特征函数，也就是进行Fourier正变换；然后利用快速Fourier逆变换数值求解功能函数的概率密度函数，进而求得失效概率。

The French are not suggesting a new EU treaty, but they have plenty of other wheezes.

法国人并不是在建议签署一个新的欧盟条约，但他们有许多其他的阴谋。

This letter was written by my brother.

这封信是我弟弟写的。