研究流体的速度和压力对载流三维管道振动频率的影响，并且探讨管道失稳时流体的临界速度。
This paper deals with the influence of fluid velocity and pressure on vibration frequency of stereoscopic pipe, and investigates the critical velocity of fluid in unstable case.
研究表明，当扰动频率低于多壁碳纳米管的临界频率时，振动模态是同轴的；
The analysis shows that when the frequency is lower than the critical frequencies of the shells in MWCNT, the vibration mode is almost coaxial.
根据这一振动模型，推导了齿轮副的平均单齿刚度、单对轮齿啮合综合刚度、有效质量、固有频率与临界转速等一系列计算公式。
The model is used to understand a series of formulae, for example, mean single tooth stiffness, gear pair mesh synthesizing stiffness, effective mass, nature frequency and critical rotating speed.
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