In solid mechanics, in the field of rotordynamics, the critical speed is the theoretical angular velocity that excites the natural frequency of a rotating object, such as a shaft, propeller, leadscrew, or gear. As the speed of rotation approaches the object's natural frequency, the object begins to resonate, which dramatically increases system vibration. The resulting resonance occurs regardless of orientation. When the rotational speed is equal to the numerical value of the natural vibration, then that speed is referred to as critical speed.
Read more about Critical Speed: Critical Speed of Shafts, Critical Speed Equation (Nc)
Famous quotes containing the words critical and/or speed:
“The disaster ... is not the money, although the money will be missed. The disaster is the disrespect—this belief that the arts are dispensable, that they’re not critical to a culture’s existence.”
—Twyla Tharp (b. 1941)
“Wait, Kate! You skate at such a rate
You leave behind your skating mate.
Your splendid speed won’t you abate?
He’s lagging far behind you, Kate.”
—David Daiches (b. 1912)