critical speed


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critical speed

A speed or range of speeds which a ship cannot sustain due to vibration or other similar phenomena.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
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The more data consumers and network users need, the more services they expect, the more critical speed becomes.
The rotating assembly which rotates at its natural frequency is called critical speed. The natural frequency and the rotational speed are expressed in hertz and RPM, respectively.
Then there's the theoretical Alfven surface -- a proposed surface, or sheet-like layer where the gradually accelerating solar wind reaches a critical speed. But that's not what DeForest's team observed.
Furthermore, the low value of the traction force in treatment T1 (Table 1) may have been caused by the increase in the driving wheel slip, which could be justified by the high critical speed (minimum travel speed of the tractor to use power produced by the engine in relation to its mass), given that in this treatment the speed was 6km [h.sup.-1], which was greater than that in other treatments.
Collision investigator Richard Davies said the critical speed for the right-hand bend, which was 55 metres before the first tree, was 77mph and that section of road was covered by the national speed limit of 60mph.
 Authorities used an equation known as "Critical Speed Formula" to show that she had been driving at 107 MPH when she lost control of the car.
"The suite leverages our unparalleled granular data assets and retail and media partner ecosystem--as well as our superior technology, which offers critical speed and accuracy --to give marketers the most precise end-to-end platform to better direct, optimize and measure the sales impact on every dollar spent and, ultimately, significantly improve return on advertising spend."
The torsional stiffness of the structure has an effect on the critical speed of flexion-torsion flutter.
[6]The torsional vibration is that shaft undergoes vibration when it reaches critical speed, so it must be operated under 70% of critical speed.
In order to further study the vibration characteristics of the coupling system, it is necessary to analyze the critical speed. Specific parameters are shown in "Geometric and Material Properties of Rotor-Blade System."
Since the nonlinear bifurcation theory is utilized in solving nonlinear vehicle problems [1-3], the study on the calculation of critical speed gets a great deal of achievements [4, 5].
A modal analysis of the rotor indicated that the shaft first critical speed modal stiffness was approximately 115,000 lb/in.

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