使转子发生强烈振动的转速，它是转子动力学中研究得比较完善的一类问题。转动系统中转子各微段的质心不可能严格处于回转轴上，因此，当转子转动时，会出现横向干扰，在某些转速下还会引起系统强烈振动，出现这种情况时的转速就是临界转速。为保证系统正常工作或避免系统因振动而损坏，转动系统的转子工作转速应尽可能避开临界转速，若无法避开，则应采取特殊防振措施。
亚临界转速 [力] subcritical speed
转子临界转速 [力] rotor critical speed
挠曲临界转速 flexural critical speed
传动轴的临界转速 critical speed of drive shaft
轴系临界转速 [机] critical speed of shafting ; combined critical speed
扭转临界转速 torsional critical
快速通过临界转速 quick passage barred rpm
高临界转速 higher critical speed
临界转速范围 critical speed range
The critical speed and vibration form of the test rotor-bearing system were calculated with MATLAB software, considering such factors as flexible support, shear deformation and moment of inertial.
通过MATLAB编程,得到了鼠笼-轴承-转子系统的临界转速及振型,其中考虑了弹性支承、圆盘转动惯性、剪切变形的影响。
参考来源 - 轮盘超速试验台减振结构动态特性分析及优化The optimization of spindle structure was finally done. The first set of critical speed of two spindles is increased by 8.7% and 3.6% and the static stiffness of two spindles is increased by 1.7% and 3.6%.3.
对电主轴结构进行了优选设计,使5SD51A和5SD18-4型电主轴的一阶临界转速分别提高了8.7%和3.6%,轴端静刚度分别提高了1.7%和3.6%。
参考来源 - 高速机床主轴动态特性分析·2,447,543篇论文数据，部分数据来源于NoteExpress
并对改进后传动轴的临界转速进行了测定分析。
Critical rotary speed of the revamped driving shaft is also measured and analyzed.
临界转速是离心压缩机转子系统的主要动力参数之一。
Critical speed is one of the important dynamic parameters of the rotor system in centrifugal compressor.
由此，推导出立轴柱形变螺距螺旋开沟机的临界转速。
Thus, Calculating the critical rotational speed of the helix ditching machine.
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