频域法

管道中非稳定流动的分析方法主要有频域法和时域法。

The main analytical method of unsteady flow in pipelines includes frequency domain analysis and time domain analysis .

分析了时域法、频域法对不同类型误差的敏感程度。

The dissertation also presents the sensitivity of time domain method and frequency domain method to different kinds of error .

线性多变量反馈系统频域法CAD软件包

Computer-Aided Design Package for Linear Multivariable Feedback System Frequency Domain Approach

多变量反馈控制系统的现代频域法CAD程序包

Computer Aided Design of the Multivariable Feedback System Based on Modern Frequency Domain Methods

PSS时间常数的频域法分析

Analysis of PSS Time Constants Using the Method of Frequency Domain

采用线性调频Z变换频谱校正进行局部频率细化提高频域法阻尼识别精度。

Chirp Z Transform is used to local frequency refining for improving the identification accuracy in frequency domain .

基于频域法的PSS最佳参数

Optimum Parameters of PSS Based on Frequency Domain Method

提出了在PID条件下闭环辨识的方法，运用频域法，通过有关模和相角的关系，辨识出假定二阶过程模型的有关参数。

A method of closed-loop identification under PID and identifying parameters of proposed second-order process model through relationship of mode and phase in frequency domain method are proposed .

BTT导弹自动驾驶仪的多变量频域法解耦设计

Decoupling Design for Bank to turn Missile Autopilot Using Multivariable Frequency domain Approach

提出对LPC残差用频域法来进行处理，得到改变了基音周期的LPC残差，从而实现语音的基音周期的变换。

Frequency method is proposed to process the LPC residual , then the pitch modified LPC residual is got .

关于时域法与复频域法求解LTI系统时解的一致性问题

Consistency Issues of the Answer to Using Time-domain and Complex-frequency-domain Methods to Solve LTI Systems

介绍了时域法与频域法的几种偏振模色散（PMD）的测量方法，其中包括了一种新的测量方法&调制相移法。

Several methods for measuring PMD based on time-domain and frequency-domain are introduced , of which a new method & modulation phase shift technique is also presented .

在ISAR距离对准频域法的基础上，提出了一种新的ISAR运动补偿法。

A new motion compensation approach of ISAR is developed based on the frequency domain method of range realignment which is able to perform range realignment and phase compensation simultaneously .

本文着重介绍频域法测量CATV同轴电缆回波损耗的方法，并对某些波形进行分析，提出改进建议。

This paper focuses on the return loss measurement methods for CATV cables , of which frequency domain method is chosen . In addition , some waveforms are analyzed and some suggestions for improvement are given .

利用频域法应用MATLAB软件对2008年汶川地震中汶川卧龙获得的地震波和美国EI地震波平动分量进行傅里叶变换得到相应的扭转分量。

Use MATLAB software in frequency-domain method , acquire torsional component of the seismic waves which wenchuan wolong station obtained in wenchuan earthquake and American EI waves through the fourier transform of corresponding translational motion components . 2 .

根据谱半径相关理论，通过频域法，在只要求系统矩阵A为Hurwitz矩阵的条件下，得到了线性不确定多时滞系统的稳定性新判据。

As the system matrix A is a Hurwitz matrix rather than a negative matrix measure , a new criterion of stability is obtained .

应用经典控制理论中的频域法，得到了系统可镇定PI控制器参数的完整的取值域，同时也得到开环不稳定系统存在可镇定PI控制器的充要条件。

Using frequency-domain design method , not only the complete parameter set of stabilizing PI controller is achieved , but also the necessary and sufficient condition for the existence of a stabilizing PI controller for an open-loop unstable system is derived .

在经典控制理论中，频率特性分析是联系时域法和频域法的桥梁，而且它还可以解决Routh判据无法解决的一些问题。

Analysis of frequency characteristics in classical control theories serves as a bridge connecting time domain method and frequency domain method , and solves problems beyond Routh Criterion .

基于中频发电机AC-DC整流模块产生共模干扰的机理，利用频域法对共模干扰电压进行了计算，并通过MATLAB数学仿真得到了其频谱图，该方法可以推广到其他电力电子系统的电磁干扰分析计算中。

Based on the mechanism of the common-mode EMI from AC-DC rectification module of intermediate frequency generator , the voltage of common-mode EMI is calculated using frequency domain method , and the spectrum diagram is obtained by mathematical simulation via Matlab .

在回顾PID控制器的历史和发展现状的基础上，着重介绍内模法、频域法和直接综合法三种重要的PID控制器设计方法和控制系统性能指标，综述了目前控制器性能评价技术及其应用情况。

Chapter 1 reviews the state-of-the-art in PID controller , represents the three methods for designing PID controller : IMC-based method , frequency method and direct synthesis method , and introduces some control performance measures . Moreover , a short survey of controller performance assessment and monitoring technique is given .

基于谐波平衡法和反馈系统理论，用频域法分析了在线性前馈部分具时滞的非线性映射的Hopf和倍周期分岔。

A unified frequency-domain method to analyze Hopf and period doubling bifurcations in nonlinear maps having time delay in the linear feedforward path is presented . The technique relies on the HBA ( harmonic balance approximation ) and feedback systems theory .

采用了Zuber-Findlay漂移流模型，借助于多变量频域法分析两相流密度波不稳定性。

Two-phase flow density-wave instabilities are analyzed by means of multi-variable frequency-domain method based on Zuber-Findlay type of drift-flux model .

应用频域法推导出PSS相位补偿器的参数设定式，把时间常数直接表达为功能指标的函数，将其用于现场调试，可使补偿器获得最佳的补偿效果。

The parameter setting formula of PSS phase compensator was deduced by using frequency domain method , in which taking directly the time constant to be the function of action indexes , it was shown that applying this to debugging on site could gain optimal compensation effectiveness .

首先简述频域法的理论基础：Parseval定理和最佳化定理。然后分别介绍古典根方轨迹法以及频域法的各项现代成果。

At first , it briefly states the theoretical bases of frequency-domain technique-Parseval 's theorem and optimization theorem , then classical root-square locus method and the advanced contributions to frequency-domain technique are discussed .

本文利用KZK方程，通过频域法将超声波的基波和各次谐波分离，综合考虑衍射效应、吸收效应和非线性效应，并通过数值运算来描述它们的声场特性，获得其指向性特征。

In this model , the harmonics are separated from the fundamental and the diffraction , nonlinear and absorption effects are included . The numerical simulation is performed to describe the sound field characteristic and the directivity of ultrasonic in the air .

频域法在牵引网故障测距中的应用

Application on Fault Location of Traction Networks Based on Frequency Domain

辨识液体晃动力学参数的频域法

Frequency domain method of identifying mechanical parameters of sloshing liquid

微带天线全波频域法中的小波应用

Full Wave Spectral Domain Analysis of Microstrip Antennas by Wavelet Expansion Method

频域法直线误差分离技术的周期性假设

Periodic Assumption of Frequency Domain Method for Straightness Error Separation

用频域法实现圆环形目标物的计数

The Realization of Circular Ring Counting Using Frequency Domain Method