结构上部的加速度幅值大于下部的加速度幅值。
The acceleration amplitude of upper structure is larger than lower.
可坍陷管中，当管流速度幅值超过临界速度时，会产生失稳和位移振荡。
When the maximum velocity of an oscillated flow in the collapsible tube exceeds the so-called critical velocity, the tube will become unstable and oscillate with displacement.
求解扰动速度幅值的演化规律，是流动稳定性非线性理论的关键问题之一。
One of the key problems in the nonlinear theory of the hydrodynamic stability is to determine the law of the evolution of the disturbance velocity amplitude.
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