Disturbance degree of the apparent phase velocity increases with decrease of frequency until a maximum one occurs.

表观相速度扰动程度随频率减小而增加，直至出现大扰动。

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A finite dimensional repetitive control method is proposed for the high precision velocity control of servomechanisms subject to significant nonlinear disturbance torque.

提出了一种有限维重复控制方法，以实现对有严重非线性扰动力矩的伺服机构的高精度速率控制。

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The results show that the wavy interface and vortex street are caused by the velocity distribution of shear flow and periodic disturbance at the interface.

研究表明波状界面和涡街是由界面处的剪力流速度分布和周期性扰动所造成的。

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