rotation-vibration state

Is the state of the axial rotation of a rigid body at constant angular speed stable?

刚体的匀角速定轴转动状态是平衡态 吗 ?

When the motion of the basic state is the shear flow ( or the differential rotation), this property means that the unstable waves would evolve automatically into the quasi-stationary stage.

当基态运动为剪切流（或较差旋转）时，这一性质将使不稳定波自动演化到准稳阶段。

This paper gives the hydrostatic pressure expression for ideal fluid and the Bernoulli's equation for steady flow state in uniformly rotation frame reference. And two applied examples are given.

给出了相对转动参照系静止的理想流体内部的压强及稳定流动时的伯努利方程，并应用导出的压强公式和伯努利方程求解了两个问题。

Considering beam sagging moment capacity, joint moment capacity, joint rotation capacity and required rotation capacity, the plastic analysis method is suitable for the design of beams for semi-rigid composite frames under vertical loads at ultimate limit state.

塑性分析方法考虑了组合梁的跨中弯矩承载力、节点弯矩承载力、节点转动能力和设计需要的节点转动能力，适用于竖向荷载下半刚性连接组合框架梁的承载能力极限状态设计。

Based on the modern state feedback control theory and the demand of no error of hydraulic turbine ( rotation speed) regulation system, the similar block diagram of the traditional hydraulic turbine regulation system was obtained from state feedback model of the hydraulic turbine control system.

本文应用现代状态反馈控制理论，结合水轮机（转速）调节系统的恒值调节要求，从水轮机控制系统状态反馈模型出发，给出了与常规水轮机调节系统相似的系统框图。