Vibration Machine

vibration machine

[vī′brā·shən mə‚shēn]
(mechanical engineering)
A device for subjecting a system to controlled and reproducible mechanical vibration. Also known as shake table.

Vibration Machine

 

a machine in which the oscillatory motion necessary to complete or intensify a process is im-parted to the working member. The frequency of the vibrations of such machines varies from several hundredths of a hertz up to 10 kilohertz (kHz), and the amplitude of the vibrations ranges from 1 m to fractions of a micron.

Vibration machines are classified according to the type of drive (mechanical, electrical, hydraulic, and pneumatic), the way in which the power supplied to them is converted into the energy of mechanical vibrations (centrifugal, in which the vibrations are caused by the motion of unbalanced rotors [disbalances]; reciprocating; cam; crank; electromagnetic; electrodynamic; magnetostrictive; and piezoelectric), the spectral composition of the induced vibrations (harmonic [sinusoidal], biharmonic, or polyharmonic), the path described by points on the working member (rectilinear, circular, elliptical, spiral, and so on), and the presence of impacts (nonpercussion or vibration-percussion).

Vibration machines have become widespread in construction and the construction-materials industry for compacting cement mixes and soil and road coverings, for forming reinforced-concrete parts, for working frozen soil, and for sinking piles, sheet piles, and pipes; in machine building they are used in preparing casting molds and cores and for knocking out molding boxes, for vibration processing and vibration cutting, for supplying automated machine tools with correctly oriented blanks (vibration hoppers), and for transporting blanks and parts between operating stations on auto-mated production lines (vibration conveyors); and in mining they are used for screening (vibration screens) and for drilling, loading, and moving spoil. Vibration machines are also used in transportation for unloading compacted or congealed materials, loading and unloading granular materials, and compacting broken stone ballast; in machines of the food industry and agriculture (vibration grids and separators, vibration pumps, and vibrating poultry feeders); in public utility services (laundry equipment and machines for removing compacted snow and ice from roads); in medicine (massage machines and dental drills); and in many other fields.

REFERENCES

Povidailo, V. A., R. I. Silin, and V. A. Shchigel’. Vibratsionnye ustroistva v mashinostroenii. Moscow-Kiev, 1962.
Vibratsionnye mashiny v stroitel’stve i proizyodstve stroiteVnykh materialov: Spravochnik. Moscow, 1970.

I. I. BYKHOVSKH

B. G. GOL’DSHTEIN

References in periodicals archive ?
(33 items) for existing 1-ton capacity lds make vibration machine, model v830 335 at etdc, hyderabad
The elastic fixation used in anti-shock lenses gives a better performance over time; the shift in optical axis is reduced to between 4[micro]m and 10[micro]m in Fujinon Anti-Shock and Vibration machine vision lenses.
Below are some major advantages of a Whole Vibration Machine:.
The aim of this study was to identify Eigenfrequencies of novel legs' vibration machine depending on different human weight and make an experiment identifying blood circulation changes in foot using thermovision camera.
KEYWORDS: dimensional accuracy vibration machine tool vibration rigidity turning chatter.
The vibration machine was set to 26 Hz and the foot position equated to 6 mm to a peak-to-peak displacement.
It also makes the fibres contract at a very fast rate, which means you can do the same amount of work as lifting a heavy weight by simply going through the motions of an exercise on the vibration machine.
"It has a vibration machine that can simulate 30 years of aircraft life in just four hours.
Best also advised Jessica to take a leaf out of Madonna's buff-bod book, and get on the Whole Body Vibration Machine.
But it is, in fact, a high-speed vibration machine which Madonna swears by...
These tests are being conducted in conjunction with planned repair activities on a particular section, where a serious impact will be "allowed." These tests also will include deliberate drilling, scratching and striking of the pipeline, in addition to "support" from a vibration machine supplied by GE.
After three iterations, NASA created a physical prototype and affixed it to a vibration machine in its laboratory that simulated 14.1 Gs (RMS) in the x-, y-, and z-directions.