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.
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。
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。
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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