查询词典 frequency band

The wavelet time-frequency properties of the uncracked rotor and the cracked rotor were discussed by the continuous wavelet time-frequency analysis algorithm. A new algorithm using the wavelet time-frequency analysis algorithm to detect the crack was proposed. The influence of the sampling frequency on the wavelet time-frequency analysis algorithm was analyzed through the numerical simulation research; the valid sampling frequency was presented.

利用连续小波时频分析方法，讨论了裂纹转子与无裂纹转子的小波时频特性，提出了利用小波时频分析方法识别裂纹的新方法；数值仿真研究了采样频率对小波时频分析方法的准确性和有效性的影响，并给出了建议性的采样频率。

When microgrid is operated in islanded mode, VSGs can be divided into non-frequency regulation units and frequency regulation units, the former can generate power and participates in primary frequency control according to dispatching to mitigate system frequency deviation due to disturbances; the latter can offer referential voltage of microgrid and use secondary frequency regulation to implement no-error frequency control.

微电网孤岛运行时，将虚拟同步发电机分为非调频发电单元和调频发电单元，前者既能按照功率调度指令发电，又能参与一次调频，缓解扰动情况下系统频率的波动，后者提供微电网参考电压，并利用二次调频实现频率的无差控制。

The number of the frequency division of the method and the circuit structure thereof do not influence the highest frequency of the working circuit. The normal work of the frequency division circuit can be at a comparatively high clock frequency, and the clock frequency division can be realized in the manner of cascade connection of the frequency division circuit so that the scale of the circuit realization can be properly reduced.

本发明所述方法及其电路结构的分频数大小不影响电路工作的最高频率，可以使分频电路正常的工作在相对很高的时钟频率，而且可以通过分频电路级联的方式实现时钟分频，从而可以适当减小电路实现的规模。

The Company is responsible for people at high-frequency machine Through more than ten years of research and design, has been developed to create a series of applicable to all types of plastic / PVC, rubber, leather, Blister packaging high-frequency welding / fusing machine; trademark high-frequency equipment machinery, high-frequency metal weld / heat treatment machine ; high-frequency pipe machine; high-frequency synthetic resin preheating aircraft and other special plastics processing machinery.

本公司负责人在高周波机器上通过十余年的研究和设计，现已开发，制造出一系列适用于各类塑胶/PVC，橡胶，皮革，吸塑包装等高周波熔接/熔断机；高周波商标专用设备机械，高周波金属熔接/热处理机；高周波制管机；高周波合成树脂预热机以及其它特殊塑胶加工机械等。

3I described two sub-band division method in the frequency domain, and brought forward idea that the energy unitary, and the use one of them to decompose and calculate the entire frequency band. After analysis the results, I could achieve to the band of each prompting and respond, and we used this section energy to determine whether or not unconventionality about the size of valve clearance.

3在频域中描述了子带的两种划分方法，提出了对能量进行归一化的基本思想，并用其中的一种划分方法对整个频带进行了分解计算，经过对计算结果的分析，得到了各个激励响应集中的频带范围，并由此段能量的大小来判断气门间隙有无异常。

For narrow-band signals, three uniform linear arrays, whose grating lobes are not overlapped by setting the angles between the arrays and the same pointing of main-lobes, are used and then multiplication of three patterns is operated to reduce the grating lobes of large-spaced array, which makes the array operate in broad band. For wideband or ultra-wideband signals, array pattern in the whole frequecy band is identical by designing the frequency-dependent weighting coefficients based on the Bessel function, and therefore grating lobes in high frequency parts are suppressed.

对于窄带接收信号，利用三个相交的大间距均匀线阵，通过设置它们之间的角度和主瓣指向相同使各自的栅瓣位置错开，然后把三个方向图相乘从而抑制大间距阵列栅瓣，因而适用于宽频带工作；对于宽带接收信号，利用Bessel函数设计与频率有关的加权系数，产生整个信号带宽内恒定的方向图，从而抑制了高频部分的栅瓣。

Through discussing further the reflective and refractive coefficients of line boundary, the features of line boundary are as follows: the attenuation of high frequency band (especially in band of line trap) of transient components generated by fault through line boundary is obvious, whereas the low frequency band (1~10kHz) components are hardly influenced. Moreover, the transient components below 100kHz should be adopted in purpose of outstanding the line boundary and weakening the transmission influence of transmission line.

通过对线路边界的透、反射系数的进一步分析发现：暂态信号的高频段穿越线路边界时将大为衰减，而低频段(1~10kHz)几乎不衰减；为弱化线路的传输影响而突出线路边界的作用，宜选用100kHz以下的信号分量。

It can eliminate the effect of rotor speed and sampling frequency on the distribution of wavelet analysis frequency band energy. Energy features of the frequency band gave unified physical meanings.

该方法能消除转子转速和采样频率对小波分解频带分布的影响，提取的频带能量特征具有统一的物理意义。

In this paper, an algorithm to achieve both two dimensional high resolution and wide swath is proposed. Every small satellite work in the active state, they transmit and receive different frequency band signal simultaneity. First, the azimuth ambiguity is eliminated in each frequency sub-band, then the signal is rectified to zero Doppler frequency, after that this algorithm does the range spectral synthesis to achieve high range resolution.

该文分析了一种沿航向排列分布式小卫星宽测绘带二维高分辨率成像技术，每颗卫星同时发射接收不同频率的线性调频信号，先分别在每个子带解方位多普勒模糊，并将方位多普勒中心频率调整至零频，然后在距离向进行子带拼接得到大带宽的线性调频信号从而得到高的距离向分辨率。

According to the mine shaft tunnel to the microwave frequency band in the certain degree to the channel characteristic, the radio frequency selects the microwave frequency band 433MHz to make the carrier, enables the wireless signal to carry on the effective dissemination in the line of sight distance, has the transmission stability to be good, external interference small merit.

根据井下隧道对微波频段在一定程度上相当于通道的特点，射频选用微波频段的433MHz做载波，使无线信号能够在视线距离内的进行有效传播，具有传输稳定性好，受外界干扰小的优点。

I think people in this lifetime in a rebirth.

我觉得人在这一生里其实也在轮回。

He had to tie her hands together.

他不得不把她的双手绑在一起。