critical damping

The AMA with constant voltage source exhibits damping character, while with constant current source it provides only a negative stiffness that lowers the critical speed of the rotor system.

当提供的电源为恒流源时，控制执行器仅提供负刚度，从而使整个支承刚度降低，转子临界转速下降，此时宜采用变刚度控制。

Through the analyses of mathematics and mechanics this paper obtained a relationship between the uniformity coefficient AC of critical movement and the damping ratio ξ of motion system while the rotating parts revolve at low speed.

本文通过数学力学分析，得出了转动部件低速转动时临界运动均匀性系数AC与运动系统阻尼比ξ的关系。

Four parameter-tuning methods of PID controllers, i. e. critical proportional method ( Z-N method), Damping oscillatory method, robust PID Parameter Tuning method and ISTE optimal Parameter Tuning method are studied comparatively.

主要从比较的角度研究了适合典型工业过程的4种PID控制器参数的整定方法，包括临界比例度法、衰减曲线法、鲁棒PID参数整定法和ISTE最优参数整定法。

We show that there is thermal instability above a critical temperature T c. The effective mass and damping rate are proportional to gT and gT respectively.

发现在临界温度Tc以上存在热不稳定性，而有效温度和衰变率则分别正比于gT和gT。