Results 271 to 280 of about 38,828 (312)

Vibrations of air columns

1981
Sound waves consist of regular variations of pressure transmitted from particle to particle through a medium. These changes of pressure are set up by the vibrations of the source. The regularity of the variations (considering a musical note as distinct from noise) means that a condition of high pressure, called a compression will be followed by a ...
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Vibration characteristics of steering columns with bellows

Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 2001
Bellows can be used as collapse elements for automotive steering columns. The crash performance of the steering column can be significantly improved with the bellows. However, the bending flexibility of the bellows has negative effects on the vibration characteristics.
K H Kim, G H Han, H K Kim
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The Vibrating Air Column

2011
While the vibrating strings of guitars and violins are plainly visible, the sound that they produce in air is invisible. We often associate sound with air because we are used to hearing sounds that reach our ears from the air. We also learn that in the absence of air, sound cannot propagate – movies with sound propagating in outer space, not ...
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Response of a Column in Random Vibration Tests

Journal of the Structural Division, 1975
Laboratory experiments were conducted to observe and measure the response amplitude and frequency of a simply supported column. The column was excited by axial forces generated from sinusoidal and random (bandwidths of 3 Hz, 10 Hz, 30 Hz, and 100 Hz) signals.
Gene K. Baxter, Ross M. Evan-Iwanowski
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Vibration of column-supported floor slabs

Journal of Sound and Vibration, 1972
Abstract The finite element displacement method of analysis is used to determine the vibration characteristics of floor slabs on four column supports. The results obtained are compared with other theoretical solutions and also experimental measurements. The effect of rigidity and finite area of the column supports are investigated.
M. Petyt, W.H. Mirza
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Parametrically Induced Vibration in Concrete Columns

Journal of Engineering Mechanics, 1993
A mathematical model is developed for simply supported plain concrete columns, accounting for their nonlinear material characteristic. The axial and transverse motions of concrete columns are found to be secnd- and fourth-order nonlinear partial differential equations, respectively.
Nader Ghafoori, Kambiz Farhang
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Intensification of bubble columns by vibration excitement

Catalysis Today, 2003
In this paper we show that application of low-frequency vibrations, in the 40-120 Hz range, to the liquid phase of an air-water bubble column causes significantly smaller bubbles to be generated at the nozzle. In experiments with a single capillary nozzle, the bubble size is reduced by about 40-50%, depending on the vibration frequency and amplitude ...
Ellenberger, J., van Baten, J.M., Krishna, R.   +2 more
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Hydrophone Calibration in a Vibrating Column of Liquid

The Journal of the Acoustical Society of America, 1962
Absolute pressure calibrations of hydrophones have been performed in the laboratory by immersing the hydrophone in a column of liquid set into vibration. Sound pressures of over 1000 dyne/cm2 can easily be obtained. Various limitations on the procedure, such as those due to fluid motion around the hydrophone, and wave effects in the liquid column are ...
F. Schloss, M. Strasberg
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Vibrations of the Reed and the Air Column in the Clarinet

The Journal of the Acoustical Society of America, 1961
The vibrations of an artificially blown clarinet were studied by a photoelectric method in which light from a source placed at the bell of the instrument passed through the aperture between the reed and the mouthpiece and into a photomultiplier tube whose output was observed on an oscilloscope.
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Investigation on nonlinear coupled vibration of columns.

2011
The oscillation of a column subjected to periodic axial end excitation was analytically and experimentally investigated. The initial crookedness of the column and the longitudinal inertia of a column element give rise to coupled, longitudinal-flexural oscillations. A snap-thru phenomenon and complex subharmonics of natural flexural modes of oscillation
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