critical speed


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critical speed

[′krid·ə·kəl ′spēd]
(cryogenics)
(fluid mechanics)
(mechanical engineering)
The angular speed at which a rotating shaft becomes dynamically unstable with large lateral amplitudes, due to resonance with the natural frequencies of lateral vibration of the shaft.

critical speed

The angular speed of rotating machinery at which excessive vibration is produced; at this speed the periodic disturbing force coincides with a mechanical resonance of the shaft and/or of the machinery or its supports.

critical speed

i. The speed on the takeoff run at which, should one engine fail, the pilot can decide whether to abandon or continue takeoff. Below this speed, the pilot must abort takeoff. Critical speed is denoted V1.
ii. A rotational speed at which the engine suffers dangerous resonance.
References in periodicals archive ?
2002) The validity of critical speed determined from track cycling for identification of the maximal lactate steady state.
The other 8 coefficients obtained improve the calculation of the critical speed of a rotor by including the flexibility of the bearing oil film due to angular displacements of the shaft.
This constitutes primary information of a produced glider used for possible forecast of flutter without reaching the critical speed [1, 4].
Below a certain critical speed, the motion is damped out and above the critical speed the motion can be violent, damaging track and wheels, and potentially causing derailment.
Police collision investigator PC George Skinner said the left-hand bend was not the worst on the road and had a critical speed of 66mph.
His plane had reached a critical speed, the V-point, when it is going too fast to brake without running out of runway, and probably has a heavy load of fuel.
Burn can be reduced when fluids exceed a critical speed in the grinding zone and sufficient flow is available.
The team found that, for any given forest density, there exists a critical speed above which there is no "infinite collision-free trajectory".
From their study, it can be concluded that there is no critical speed in case of dry turning below which tool material manintains it hardness and above which tool softening occurs as observed by Ezugwu et al.
Exploitation speed higher than the first critical and lower (in most cases) than the second critical speed is the typical feature of such rotary systems.
2005) Critical speed does not represent the speed at maximal lactate steady state.

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