相同介质中不同频率的弹性波传播速度是有差异的，即频散问题。
The propagation velocity of elastic wave with different frequencies in same medium is various, which is called dispersive problem of frequency.
分析了热油输送管道沿程瞬态负压波传播速度的变化，采取两种搜索方法数值积分求解泄漏点位置。
The velocity change of instantaneous negative pressure wave along the pipeline is analyzed when hot oil is transported. Two searching methods are applied to locate leakage through numerical integral.
着重分析了相间作用力，包括壁面剪切应力、虚拟质量力、拖拽力，对压力波传播速度和衰减的影响。
The interphase forces on the propagation were investigated, including wall shear stress, virtual mass force and drag force.
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