查询词典 frequency analysis

Based on the original damping coefficients formula, the improved Reynolds equation is presented and the damping coefficients formula include the frequency variable is recomputed. The relation with the damping coefficients and working frequency is obtained and the results are certified using the finite element analysis simulation. Moreover, the damping coefficients of perforated-hole film are obtained on the basis.

本文在推导原阻尼系数公式的基础上，提出了改进的雷诺方程，重新推导得到了包含频率信息的膜结构阻尼系数公式，指明了阻尼系数与工作频率之间的关系，并通过有限元仿真分析给与验证，同时在此基础上得到多孔方形膜结构的阻尼系数。

A two-times locating method based on the gray contrast of surroundings is presented in locating central reference point. This method has better adaptability and robustness, and can basically meet for the accuracy of automatic locating center. Fourier spectral analysis is improved to obtain a more accurate ridge frequency in computing ridge frequency. The average ridge width is used in designing Gabor filters, so the filters have certain adjustability. The rotating invariance of fingerprint images is solved by the rotating of feature models in feature matching.

在中心参考点定位部分，提出了基于局部邻域灰度对比度的二次定位方法，该方法具有较强的适应性和鲁棒性，基本满足自动中心定位的准确度要求；在频率域估计中，改进了傅立叶谱分析法，提高了纹线频率计算的准确度；引入平均纹线宽度作为Gabor滤波器的设计参数，使滤波器具有一定的自适应性；在特征匹配阶段，通过对特征模板的旋转解决指纹图像的旋转不变性问题。

The dynamics equation is established using Lagrange method, and the formula of free frequency is deduced according to modality analysis of general viscous damp. Instantaneous wallops are applied to X, Z dimension respectively, observing the movement of the moving platform, and use ADAMS software to validate the free frequency of the system.

采用Lagrange方程建立了系统动力学方程，根据一般粘性阻尼系统的模态分析法，推导了求解固有振型的公式；分别在X、Z方向上施加一定的瞬时冲击力，观察动平台的运动情况，并采用ADAMS软件验证系统的固有频率。

Based on an analysis of the frequency sounding curve of the CSAMT method (controlled source audio-frequency electromagnetic method), the authors have found that the curve intersects the curve in the transition region.

通过对卡尼亚视电阻率法频率测深曲线的分析，发现卡尼亚视电阻率与远区电场分量E的视电阻率曲线在过渡区出现相交的现象。

At the same time, by using wavelet transform time-frequency analysis technique, this paper proposes sedimentary microfacies such as underwater braided channel, mouth bar and beach bar which have different time-frequency characteristics. It boosts the exploration of this area greatly.

同时，利用时频分析技术，提出了水下辫状河道、河口坝、滩坝等沉积微相具有不同的时频旋回特征，为该区的勘探提供了沉积依据。

The Hilbert modulus is defined as the sum of the square of a signal and its conjugation.Hilbert modulus is used to covert the fundamental component in original phase current to direct current component,the fault characteristics frequency of bar break is transformed into the twice slip frequency.The problem is solved that fault characteristic component in the spectrum analysis of the current is easily to be blanketed by fundamental component and is hard to highlight fault characteristics.

将Hilbert模量定义为原始信号与其共轭信号的平方和，利用Hilbert模量将原相电流中的基波分量转变为直流分量，原频谱分析的转绕组断条的故障特征分量转变为频率为二倍转差频率的电流分量，决了相电流频谱分析方法中断条故障特征成分容易被基波湮没而难以突出故障特征的问题。

At last, the frequency spectrum analysis shows that the four-winged chaotic attractor has extremely wide frequency bandwidth compared with that of the Lorenz system and Chua circuit, which is important in practical applications in communication encryption etc.

最后，通过比较该四翼混沌吸引子的系统、Lorenz系统、Chua氏电路等混沌信号的频谱发现，四翼混沌吸引子的系统信号具有极宽的频谱带宽，该特性在通讯加密等工程应用中具有重要价值。

Analysis the effects of the frequency response difference between the sensor channels on the performance of the radar with linear frequency-modulated and pulse compression system.

分析了线性调频脉压体制下通道频率特性差异对雷达性能的影响。

The simulation for the multi-component linear frequency-modulated signals demonstrates the improvement of classification performance compared with time-frequency analysis only.

以分类误差最小为目标，自适应调整支撑矢量核和时频表示核的参数，并对SAR运动目标回波模型——线性调频信号进行仿真实验，实验结果表明这一方法提高了分类精度，改善了分类性能。

Using time frequency analysis and image processing the modulation of linear frequency-modulated signal is analyzed and using relatively non-ambiguity phase revaluation technique, the modulation identification of phase-coded signal is also studied.

脉内调制特征中采用了时频分析方法和图像处理的方法分析了线性调频信号，采用相对相位无模糊的方法分析了相位编码信号。

After explaining total design of automated test system for microcircuit , the thesis introduces GPIB standard .

文章在说明了微电路模块自动测试系统的总体设计后，对GPIB标准进行了介绍。

He interceded in my behalf.

他替我说情。