脉动频率

该变换器继承了交错并联反激变换器的优点，两个并联单元互补工作，分担功率损耗，输出电压的脉动频率为主开关管的两倍。

It inherits the virtues of interleaving flyback converter . It has two units working alternately , the power loss of the converter is distributed and the output voltage ripple frequency is twice of the switching frequency .

对计算结果进行FFT（FastFouriertransform）变换，获得了记录点的压力脉动频率，计算结果与实测结果吻合很好；

The results were analyzed by FFT ( fast Fourier transform ) to determine the pressure oscillation frequencies at different points .

直流电机转速与电流换向脉动频率关系新表达

A New Expression Between the Rotate Speed and Current Commutating Pulsant Frequency of DC Motor

利用功率谱分析气动力脉动频率和旋涡脱落之间的关系；

The relationship between the frequencies of fluctuating aerodynamic forces and vortex shedding by the power spectrum analysis ;

传热的强化效果随着流动Re数、脉动频率以及振幅的增大而增强；

The intensity of heat transfer enhancement increases with the increase of Reynolds numbers , pulsating frequency and amplitude .

实验上观测到光反馈引起激光脉动频率漂移和混沌运转等现象。

The phenomena of pulsing frequency shift and chaos in CO2 laser caused by light feedback are observed experimentally .

利用直接摄像技术，对一个采用该燃烧方式的射流火焰在不同流量脉动频率下的火焰类型和结构特征进行了研究。

A turbulent diffusion flame exploring this technique was investigated in various conditions of different oscillating frequency through direct photographs .

数值模拟结果表明，纤维帽内外压力差脉动频率的微小变化有可能导致纤维帽运动形式产生质的改变；

Numerical studies showed that small variation of the basic frequency might cause a qualitative movement change of the fibrous cap .

综述表明，气流紊动特性对热舒适的研究目前主要还集中在湍流度和脉动频率两个参数上；

The research on the influence of airflow fluctuations on thermal comfort mainly focuses on the effects of turbulence intensity and fluctuation frequency .

氧气流速上升，火焰脉动频率及火焰噪声降低，火焰整体趋于稳定。

With the increase of oxygen speed , the flame pulse frequency and flame noise decrease , and the flame tends to be stable .

提高了输入、输出电流的脉动频率，减小了输入及输出滤波器体积。

The ripple of the input and output current is reduced , correspondingly , the volume and weight of the output and input filter is also significantly reduced .

阐述了火焰的特性，主要包括火焰的高度、倾斜角度、脉动频率和温度分布等方面的研究进展。

The character and structure are discussed with special regard to the flame shape , flame height and declination angle , flame pulsation frequency , and the flame temperature .

液压系统中阀门（换向阀等）突然关闭时，液压泵的流量脉动频率和管道的基本频率相互作用，可能发生谐振。

In hydraulic transmission system , the pump 's flow pulse frequency and the pipes base frequency affects each other , if the valves shut suddenly , resonance oscillation may take place .

气流温度是影响干燥过程降水幅度的重要参数，床层静止高度及脉动频率对干燥过程的影响很小。

The air temperature is the most important parameter in the relationship of current humidity vs drying time . Static bed height as well as pulsation frequency has some influence on the drying process .

接着研究了两种微型飞行器在水平阵风环境下的非定常气动特性，分别给出了模型迎角和风速脉动频率变化对微型飞行器气动特性的影响。

The unsteady aerodynamic characteristics of the two MAVs in horizontal gust are studied . Both the effects of the angle of attack of the two MAVs and the oscillating frequency of velocity are discussed .

这种脉动频率正是导致声品质恶化的主要原因，为抑制冰箱制冷系统内部流动噪声指明方向。

Such pulsation frequency is exactly the main reason that causes a sound of quality to worsen , so the experimental result of this research has offered the direction for suppressing the flow noise within the refrigeration system of the ( refrigerator ) .

自振腔产生的流体脉动频率是自振腔固有频率或其整数倍，流体脉动频率过高或过低都不利于对流换热，存在一有利于强化换热的频率范围。

The pulsation frequency produced by resonance chamber is its inherent frequency or integral multiple of inherent frequency , excessive high or low fluid pulsation frequency can both weaken convective heat transfer , so there is a certain region for enhancing heat transfer .

提出了干燥速率与干燥介质温度、气流表观速度、床层静止高度、气流脉动频率以及气流分布板开孔率之间的关系，同时也得出了床层压降与床层静止高度的关系。

The relationship between the drying rate and drying air temperature , superficial air velocity , static bed height , pulsation frequency and perforation rate of screen were developed . Also , the relationship of pressure drop with static bed height was obtained .

由这些特征向量可得到汽液两相流动脉动能量随脉动频率的分布状况，开创了对汽液两相流动密度波不稳定性研究的新视角。

The distribution and variation of the energy of the oscillation were observed inside the different fields of the oscillation frequency . This method will open a new angle for studying the density wave type oscillation of ( vapor ) - water two-phase flow .

采用傅立叶变换和小波多分辨分析对颗粒聚团瞬时浓度信号分析表明喷动床内气固两相流动具有非线性特性，小波多尺度预测了瞬时颗粒聚团浓度的脉动频率特性。

The analysis of instantaneous signal of concentration using FFT and multi-scale transfer shows that the properties of gas-solid two-phase flow are nonlinear in the spouted bed . The frequency of the fluctuation of agglomerates is predicted by the means of the wavelet multi-scale analysis .

模态分析结果表明，悬臂梁的固有频率避开了水射流增压系统的脉动频率，满足水射流机床精密加工的要求，模态分析的结果为水射流机床的减振、防振提供了理论依据。

Modal analysis shows that natural frequency of the beam is kept away from the pulse frequency of the intensifier system to satisfy the requirement of precision machining . The results of modal analysis provide theoretical basis for vibration reduction and protection of the water jet machine .

本文对系统进行了联机调试，并对实验数据从液压油的杂质、温度、个体差异、控制信号脉动频率、系统带宽限制等六个角度进行了分析。

The experiments of the platform are performed , according to the data , a detailed analysis of the experimental result is raised from six aspects concerning hydraulic oil as in contaminant , temperature , individual difference , pulsation frequency of control signal , and the restriction of system bandwidth .

研究表明通过优化设计DFB激光器件的一些参量和控制激光器的外部条件，可以有效地提高自脉动的频率，增强自脉动的稳定性，为全光信号再生设备的研制提供理论基础。

Analysis shows that frequency and stability of self-pulsation can be enhanced by optimizing the parameters and extent conditions which provide theoretical basis for design all-optical regeneration system .

齿轮泵流量脉动及其频率

Fluctuating Volume Flow and Its Frequency on Gear 's Pump

面脉动最优频率值一般在0.1&0.3赫范围内。

The optimal frequency value of the area fluctuation is about 0.1-0.3 Hz .

低佛洛德数消力池水流脉动压力频率特性的试验研究

Experimental Studies on the Frequency Properties of the Fluctuating Pressure in Stilling Basins with Lower Froude Number

对于直流电压脉动和频率调制，采用数字滤波器进行滤波后再做分析处理。

To measure DC voltage ripple spectrum and frequency modulation of AC voltage , the digital filter is used .

第二，场地土对地脉动存在频率依赖以及频率选择作用。

Second , there exists a function with frequency-dependence and frequency-selection for the response of site soil on micro-tremor .

用数值方法给出了各种参数共振的响应曲线，分析了其存在区域以及响应频率与脉动流频率之间的关系。

The amplitude-frequency response curves and the frequency properties of the parametric resonances are investigated by using the method of numerical analysis .

另外，收集国内外资料推导出尾水涡带和尾水管中接近转频水压脉动的频率计算经验公式。

Meanwhile , the frequency empirical equation of vortex belt and fluctuate whose frequency is close to the turn frequency in draft tubes are deduces .