利用数值模拟和实验研究两种手段，从频散的角度分析了基于磁致伸缩效应的导波无损检测技术在圆管检测中的应用。
In view of dispersion, the application of guided wave NDT of pipe based on magnetostrictive effect was analyzed by the combination of numerical simulation and experimental research.
通过分析不同的应力和位移边界条件得到了三种不同双层管结构中扭转模态的频散方程。
Dispersion equations of torsional modes in three different two-layer pipes are obtained by means of analyzing different stress and displacement boundary conditions of these structures.
基于对杂散的分析，本设计利用AD 9858完成了300mhz带宽的宽带线性扫频源的设计与硬件实现。
According to the analysis of spur performance, this design makes AD9858 achieve wide-band frequency sweeping of 300mhz.
分析孔隙流体性质及含量变化和测量频率变化对泥质砂岩频散特性的影响。
Effects of pore fluid property, contents variety and measurement frequency variety on frequency dispersion of argillaceous sandstone are analyzed.
国外在这方面有较系统的研究，并提出了一种预测零频到超声波频率之间全部速度频散的分析技术。
It has been researched systematically on abroad, and an analysis technology was put forward to predict all the velocity's dispersive of frequency from zero to ultrasonic frequency.
由于泄漏声发射信号的多模态特性和在管道内传播过程中的频散特性，使得通过相关分析进行管道泄漏定位的效果很差。
Due to the multi modes and dispersion nature of acoustic emission (AE) propagating in pipeline, traditional cross correlation technique do not perform well for acoustic leak location.
根据岩石电性物理分析可知，不同频率范围，岩石复电阻率频散的物理机理不同。
Physical analysis of rock electrical properties show that the physical mechanism of dispersion of rock complex resistivity in different ranges of frequency.
综合对比这些结果，可用于地层岩性解释、分析吸收和频散作用、以及分辨多次波等。
Integrated analysis of these results is helpful to strati - graphic interpretation, the analysis of absorption and frequency dispersion, the identification of multiple reflection, and so on.
接着，简要介绍了基于声波高阶差分的多次波正演模拟方法，分析了这种方法的数值频散问题，包括时间和空间频散，同时给出了它的稳定性条件。
Then the article discusses forward modeling based on acoustic wave higher difference, then analyzes numerical dispersion including time and spatial dispersion and presents its stability conditions.
结合岩心砂泥岩频散特性实验结果分析了岩心在饱水及干燥状态下声频散的特点。
Based on the results of dispersion experiments on cores of sand and shale, the paper analyzed the variability of acoustic dispersion for dry and water-saturated cores.
本课题的目的是设计一个适用于该频谱分析仪的宽频率范围、精细频率步进、低相噪及低杂散的合成扫频源。
The purpose of this project is to design a wide frequence band, fine frequency step, low phase noise and low spur synthesis sweeping source suited for the spectrum analyser.
理论分析表明，在构造与波速成像中采用高阶差分方法，可以减小频散误差、提高计算效率与计算精度、获得满意的效果。
It is theoretically shown that the application of high-order difference method in structure and velocity images decreases frequency dispersion error, but improves effect and accuracy of computation...
理论分析表明，在构造与波速成像中采用高阶差分方法，可以减小频散误差、提高计算效率与计算精度、获得满意的效果。
It is theoretically shown that the application of high-order difference method in structure and velocity images decreases frequency dispersion error, but improves effect and accuracy of computation...
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