风频率

相当风频率与渗风综合修正系数

Equivalent wind frequency and the comprehensive correction coefficient of infiltration

考虑实际风频率的渗风综合修正系数

The comprehensive correction coefficient of infiltration taking account of the actual wind frequency

静风频率对昆明大气中SO2、NOx的周期性影响

Periodic Influence of Still Wind Frequency on SO 2 and No x in Air

煤耗量、地型地貌特点、低空逆温层频率、地面弱风频率对酸雨率和降水pH值有明显的影响。

Coal consumption rate , topographic features , frequency of the appearance of low altitude inversion layers and frequency of surface weak winds are found to have significant effects on acid precipitation and pH value of the rain .

不同方位的花粉密度受主风频率影响，主风方向花粉密度占58.07%。

The pollen density of different direction is affected by the main wind direction , 58.07 % of pollen comes from the main wind direction .

由朝向修正系数和各朝向实际风频率组成相当风频率，对供暖冷风渗透耗热量计算中的单位门窗缝隙长度单位时间渗入室内的冷空气量进行了计算，得出了新的渗风综合修正系数。

Combining orientation correction factor with actual wind direction frequency arrives at an equivalent wind direction frequency . Obtains a new comprehensive correction coefficient after calculating the infiltration rate per meter gap of doors and windows and per unit time .

本文还设计出风室频率分析CAD软件，实现了有限元数据文件的自动生成，风室频率仿真计算等功能。

The designed CAD software can automatically generate data file and compute frequency .

结果表明两地夏季风降水频率较高。

The results show that the precipitation of each side occurs with high frequency .

在打开传递窗时改变风机频率，记录操作区内部压力随时间变化情况。

Change the fan frequency when the transfer window opens , and record the internal pressure of the operating area .

加热炉550kW风机频率自动跟随电机端电压的变频调速系统

Heating Furnace 's 550 kW Air Blower Variable Frequency Speed Regulation System With Motor 'S Terminal Voltage Followed Automatically by the Frequency

在系统运行过程中，直接根据外界条件将水泵和风机频率调到这个频率。

Then the pump and fan frequencies will be directly set to be the values according to the external conditions in the actual runs .

6月开始，起沙风的频率明显下降，不利于种子覆沙。

In early June , the frequence of the sand-blowing wind is obviously reduced , so it is unfavourable to the covering of seeds by sand .

本文从烟囱频率、风振频率和雷诺数三方面研究了该烟囱的振动问题。

In this paper , the vibration problem of a chimney is studied from the aspects of chimney frequencies , wind vibration frequencies and Reynolds number .

这种控制策略要求在系统调试过程中确定各种外界条件下的最小能耗工况的水泵和风机频率。

This method requires to find the pump and the fan frequencies with the lowest energy consumption at all kinds of external conditions in the commissioning process .

例如，关于风洞试验的脉动风荷载频率补偿问题和等效静风荷载的简化表达问题，均属首次提出。

For example , this paper puts forward the the frequency compensation of the fluctuating wind and the equivalent static wind loads problem in the wind tunnel tests for the first time .

并基于小波理论探讨了桥梁索塔的摆动位移与风速的关系，论证了风速和风的频率只有在一定的范围内才能保证桥梁摆动的安全。

And researched the relationship between the swing deformation speed of the bridge and speed of wind and proved that only if the frequency of wind and speed of the wind under certain scope could guarantee the safety of the bridge swing .

利用模化的椭圆翅片椭圆管双排管束，得出了不同风机频率下，沿椭圆管主轴风速分布曲线，以及风速对后部旋流区的影响。

The wind speed profile along the main axis of the elliptic tube and the influence of wind speed on the back vortices region were obtained at different frequencies of the fan for the experiments of double row elliptic finned elliptic tube bank .

贵阳市四季静风持续时间频率分析

An analysis on the frequency of season calm duration in Guiyang

变速恒频双馈风电机组频率控制策略

Frequency Control Strategy of Variable-speed Constant-frequency Doubly-fed Induction Generator Wind Turbines

基于同伦函数的风电系统频率稳定特征值分析

Eigenvalue Analysis on Homotopy Function Based Frequency Stability of Wind Power System

这一影响随着结构阻尼、结构频率与风谱卓越频率的比值的增加而减弱。

Such an effect decreases with the increase of structural damping and the ratio of structural modal frequency to predominant frequency in the wind velocity spectrum .

结果：中风病急性期六个基本证候以风证发生频率最高，占85.7%。

In the 56 cases in acute stage of stroke , the occurring frequency rate of wind syndrome is 85.7 % , the highest in the 6 kinds of mainly syndromes .

结果表明：广东沿海海陆风出现的频率和强度，沿海大于内陆，东部高于西部，海风大于陆风。

Results show that the frequency and intensity of the sea and land breeze occurrence are greater along the coast than over the inland and that in the eastern than in the western part .

文章采用最小误差逼近算法计算韦布尔分布特征参数A和K，近似拟合风电场实际风速频率分布的韦布尔分布。

This paper presents a least error approach to calculate the main parameters A and K of Weibull distribution characteristic , and fits the actual wind speed frequency distribution in the wind farm with it .

该规律为研究具有复杂形状的风机叶片的频率特性积累经验。

So the virtual mass method is used to research on the fan blade frequency characteristic .

利用锤击法和正弦激励法测试风机叶轮固有频率来对风机叶轮振动故障进行诊断。

The natural frequency of a fan impeller was measured by hammer and sine excitation . The vibration trouble of the fan impeller was diagnosed .

利用MATLAB/Simulink平台搭建控制系统的仿真模型，计算牵引步电机温升变化时冷却风机运行的频率，分析了变频控制的节能效果。

A Simulation model of control system is constructed by MATLAB / Simulink . The frequency of cooling fan under the varied temperature of traction motor is calculated . The effect of energy-saving operation control is analyzed .

双馈风力发电机组在定子磁链定向矢量控制策略下，完成了有功无功独立控制，变速恒频运行追踪最大风能，控制风电场电压与频率等预期要求。

Wind turbines in stator flux oriented vector control strategy , completed an independent active and reactive power control , variable speed constant frequency operation to track the largest wind energy , wind farm control of voltage and frequency expectations .

最后通过响应功率谱的曲线可知，结构的响应主要发生在脉动风荷载的卓越频率区以及结构的自振频率区，这说明结构的风振响应既有受迫振动又有结构共振。

Finally , the response of structure mainly occurs in the zone of transcendental frequency of impulsive wind and sympathetic frequency of the structure itself , which proves that the response both contains forced and sympathetic vibration , by the probe into the response power spectrum .

本文以实际工程为背景，采用风洞试验、数值模拟和理论推导等方法，对球面网壳结构的风荷载特性、风振响应规律、等效静风荷载确定以及脉动风的频率补偿等问题展开研究。

Based on a practical engineering , the issues of wind load characteristics , wind induced vibration , equivalent static wind loads of the spherical lattice shell structure and the frequency compensation of the fluctuating wind are studied by using wind tunnel test , numerical simulation and theoretical analysis methods .