The main analytical method of unsteady flow in pipelines includes frequency domain analysis and time domain analysis.
管道中非稳定流动的分析方法主要有频域法和时域法。
Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.
频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。
The dissertation also presents the sensitivity of time domain method and frequency domain method to different kinds of error.
分析了时域法、频域法对不同类型误差的敏感程度。
A method, based on analysis of time domain and frequency domain, applied in dynamic balance of hydro-generator rotor is presented.
提出了一种基于时域分析和频域分析的动平衡方法，应用于水轮发电机转子的动平衡。
Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.
时频分析方法是利用小波变换原理，从地震波的时间域和频率域同时对其作出分析。
Since the flight test data are of time domain, it needs to be converted into frequency domain by FFT method. Then it can be used to identify the system.
由于飞行试验数据是时域数据，使用这种方法需要使用FFT的方法将实测的时域数据转换成频域数据后再进行辨识。
It is effective method of extracting slowness when multiple waves overlap in time and frequency domain.
为多模式波在时域和频域混叠时提供了另外一种有效的慢度提取方法。
This article analyzes the plant electrical signal in time domain and frequency domain by using the statistical analysis method.
应用统计分析方法对植物电波信号进行了时域和频域上的分析。
This paper proposes a method by translating the series from time domain to frequency domain, then to a string sequence.
采用变换法则对时间序列进行从时域到频域的转换，再将转换后的数据按照一定的规则变换成字符序列；
The time domain integral equation (TDIE) method is one of the important methods in electromagnetic numerical simulations for several advantages over conventional method in frequency domain.
相对于频域方法而言，时域积分方程法有这许多优势，因此，它是计算电磁学数值方法中一个重要的方法。
A new time and frequency synchronization method based on frequency domain correlation for an Orthogonal frequency Division Multiplexing (OFDM) system is presented.
该文根据频域相关的原理，提出了一种新的用于无线移动信道下的正交频分复用(OFDM)系统的时频同步算法。
Normalization method of ultrasonic testing signal, the advantages and disadvantages of time domain, frequency domain were discussed.
探讨了超声波检测信号归一化处理的方法，以及时域信号归一化和频域信号归一化的优缺点。
This method of separating the waveform in time domain into its main elements helps to find out what part of the spectrum in frequency domain caused by what related physical phenomena.
这种在时域里对主要原理进行拆分的方法有助于找出产生电磁干扰频段的干扰源。
The authors propose a new method with combination of time domain and frequency domain by using the time-frequency distribution image of the radar signal.
借助于雷达信号的时频分布图像，提出了一种在时频联合域上进行信号识别的新算法。
Then, an improved method by combining the time domain method and frequency domain method is provided.
并就其中的时域法和频域法进行了改进，将二者结合起来，使之更有效地对速度进行估计。
Based on observed signals analysis and comparison in time - domain and frequency -domain, the method of distinguishing interfere signals and abnormal electromagnetic radiation signals is given.
基于对观测信号的时域、频域分析的比较，给出了干扰信号与异常电磁辐射信号的判别方法。
It adopts the total least square method (TLS) to identify the complete coefficient set of the loudspeaker in time domain, thus measures low frequency characteristic of loudspeaker.
采用全面最小二乘法识别扬声器系统的时域函数的全套系数，从而测出扬声器系统的低频特性参数。
The characteristic of this method is that the optimum filtering parameters can be determined only in the frequency domain, so the computation time is decreased.
该方法的特点是，只需在频域就能确定滤波参数，因而节省了大量计算时间。
Methods Time-frequency domain method was used to effectively recognize TEOAEand stimulating artifact by their different short time Fourier transformation (STFT).
方法采用时-频域识别方法，根据TEOAE与刺激伪迹不同的短时谱特征来有效识别两者。
Use relative signal processing method to pre-processing data, make time domain and frequency domain analysis, calculate the ride index and comfort, obtain relative results and export reports form.
应用信号处理相关处理方法对数据进行预处理，时域、频域分析，进行平稳性指标、舒适度计算，得出相关处理结果，输出报表。
It presents a new method of DOA estimation in time-frequency domain, via establishing the STFD matrix and combining the traditional methods of array.
通过构建空间时频分布矩阵，和传统的阵列信号处理方法相结合，从而得到一种新的时频域的波达方向估计方法。
Because the wavelet has time-frequency local property, the wavelet method can analyze the local regularity of function more effectively than frequency domain.
由于小波具有时频局部性，因此与频域方法相比，小波方法更能有效地分析函数的局部正则性。
The result shows that the new method has better effect both in the time domain and in the frequency domain and has higher SNR.
结果证明，新方法的去噪效果在时域和频域上都优于传统方法，而且信噪比更高。
Based on the analysis, a new method to detect carrier frequency of FSK signal named time-domain joint and modern power spectrum estimation is put forward.
对电力远动通道FSK信号进行了时域和频域分析，在此基础上提出了一种新的FSK信号载波频率测量方法—时域拼接结合现代功率谱估计的方法。
This paper makes the comprehensive evaluation of the quality of pile foundation through time domain, frequency domain and entropy spectrum, in which spectrum analysis is a new method.
通过时域、频域、熵谱对桩基质量进行综合评价，熵谱是一种新的谱分析方法，并通过实例分析，说明了在评价桩基质量时熵谱的优点。
The experimental results demonstrate that the new method can overcome the spectrum deviation and improve the model precision both in time domain and frequency domain.
应用结果表明：该方法可以克服谱峰漂移现象，提高模型在时域和时频域的建模精度。
The present invention discloses multistage irides image automatical focusing method combining frequency domain and time domain, method key being the image definition.
本发明公开了一种结合频域和时域的多阶段虹膜图像自动对焦方法。方法的核心在于图像的 清晰度评价。
About theoretic calculation for lightning electromagnetic field, two analytical methods are raised, which are dipole method in time domain and time-varying field method in frequency domain.
在雷电电磁场的理论计算方面，提出了两种方法，即时域中的偶极子方法和频域中的时变场方法。
About theoretic calculation for lightning electromagnetic field, two analytical methods are raised, which are dipole method in time domain and time-varying field method in frequency domain.
在雷电电磁场的理论计算方面，提出了两种方法，即时域中的偶极子方法和频域中的时变场方法。
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