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 ?
Since the operating speed of the spindle is much larger than the fourth order of the critical speed and much smaller than its fifth order, the spindle can be considered stably at operating speed.
1996) Comparison of critical speed determined from track running and treadmill tests in elite runners.
If they are operated at or near critical speed for an extended period, they will self-destruct and damage surrounding components.
The calculated results illustrate that greater pressure drop will cause higher critical speed, which is consistent with the calculated results of Jiang et al [1].
If I fly slower than that critical speed, then there is a fair possibility that I will actually be able to fly forever, always avoiding the trees," Frazzoli said.
Further, there is a critical speed below which the tangential cutting force decreases with the increase of speed due to softening of workpiece material.
2000) Blood lactate response and critical speed in swimmers aged 10-12 years of different standards.
the rotor starts with a low acceleration till 75% of its critical speed and passes the critical with a high acceleration till its operating speed) has been studied, which represents the real system in a better way.
He said the critical speed for entering the bend near Splash Point was 26mph but the Mercedes may have entered it at 48mph.
Navy ships with mission critical speed and performance for quick fiber installations, upgrades, restorations and any moves, adds, and changes (MACs) for ship alteration while at dockside or at sea.
Study of Grinding whels under critical speed, Proceedings of 7th International Multidisciplinary Conference, conference data, Romania, ISSN-1224-3264, Cotetiu, R.

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