vibrator
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vibrator
Vibrator
in the broad sense, any system in which mechanical, electromagnetic, or other oscillations may be excited—for example, strings, tuning forks, pendulums, and oscillatory circuits.
In engineering, a vibrator is a vibration exciter, or a device for producing mechanical oscillations that is used independently or as a component of vibration machines and equipment. Vibrators are used to compact concrete mixtures in erecting buildings and structures and in the manufacture of sectional reinforced-concrete products; to mechanize the un-loading of bunkers; to compact earth and road surfaces; in vibration conveyors to transport free-flowing and lump materials; to dislodge castings from molding boxes; and to test designs, instruments, and apparatus for strength and stability. The most popular types are centrifugal vibrators, driven by a built-in electric motor, and internal centrifugal vibrators, in which vibrations are produced by the rotation of unbalanced elements. In electrical measurement technology, a vibrator is the moving part of such instruments as a vibration frequency meter.
In radio physics and radio engineering, a vibrator is a segment of a straight conductor, carrying alternating current, which radiates electromagnetic waves (for example, a Hertz dipole). A wire vibrator constitutes the simplest antenna or an element of a more complicated antenna.
REFERENCES
Gorelik, G. S. Kolebaniia i volny: Vvedenie v akustiku, radiofiziku i optiku, 2nd ed. Moscow, 1959.Gol’dshtein, B. G., and L. P. Petrun’kin. Glubinnye vibratory dlia uplotneniia betona. Moscow, 1966.
Bykhovskii, I. I., and A. M. Vilenkin. Tsentrobezhnyi vibratsionnyi privod stroitel’nykh i dorozhnykh mashin. Moscow, 1968.
I. I. BYKHOVSKII and B. G. GOL’DSHTEIN
vibrator
[′vī‚brād·ər]vibrator
