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A boxlike structure for the connection of circulating tubes to the longi 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.



Related Terms

CENTRIFUGAL TACHOMETER

An instrument which measures the instantaneous angular speed of a shaft by measuring the centrifugal force on a mass rotating with it.

CRITICAL WEIGHT

In a drilling operation,the weight placed on a bit that will cause the drill string to become resonant with the angular speed at which the rotating shaft is operating.

MEAN MOTION

In undisturbed elliptic motion, the constant angular speed required for a body of a specified mass to complete one revolution in an orbit of a specified semimajor axis.

CROSS-BOX

A boxlike structure to the longitudinal drum of a sectional header boiler for connecting circulating tubes.

GEAR RATIO

The ratio of the angular speed of the driving member of a gear train or similar mechanism to that of the driven member; specifically, the number of revolutions made by the engine per revolution of the rear wheels of an automobile.

AXLE RATIO

In an automotive vehicle, the ratio of the speed in revolutions per minute of the drive shaft to that of the drive wheels.

SHAFT LOG

The centrally bored timber structure in which the propeller shaft is inserted and held in alignment.

FLYWHEEL

A rotating element flywheel fm attached to the shaft of a machine for the maintenance of uniform angular velocity and revolutions per minute. Also known as balance wheel.

REVOLUTION COUNTER

An instrument for registering the number of revolutions of a shaft, particularly a propeller shaft of a vessel (when it may be called ENGINE REVOLUTION COUNTER). This information is useful in estimating a vessel’s speed through the water.

CRITICAL SPEED

The speed were vibration increases to a point were the unit may self disintegrate.

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