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。
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。
The relation between ratio of peaks and degree of defect is worked out, then a method of quantity analysis in frequency domain is proposed.
根据这一特征，得到小峰与大峰之比与缺陷程度之间的关系曲线，提出利用导纳曲线进行缺陷量化分析。
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