Results 251 to 260 of about 851,498 (284)

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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Power dissipation in a vibrating disc column

The Chemical Engineering Journal, 1979
Abstract The power dissipation in a vibrating disc column of 17.2 cm inside diameter has been measured in a liquid single-phase system and in a gas—liquid two-phase system. For frequencies less than 5 Hz, the power dissipation in the column is mainly controlled by the maximum drag force exerted on the vibrating disc at the maximum velocity of disc ...
Kakuji Tojo, Kei Miyanami, Ikuo Minami, Takeo Yano   +3 more
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A note on vibration of beam-columns

Journal of Sound and Vibration, 1986
Abstract Eigenfrequencies for beam-columns with flexible supports are determined by a unified equation which includes all classical, idealized boundary conditions as special cases. For the approximation of linear dependence between squared eigenfrequency and column load, good agreement is found when the supports are translationally fixed, but slight ...
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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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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 of a Segmented Heavy Column

Journal of Vibration and Acoustics, 2010
The vibration of a standing (or hanging) segmented column, affected by its own weight, is studied. The governing difference equations are solved numerically. The results tend to those of the continuous column as the number of segments tends to infinity.
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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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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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Review of Bubble Column Reactors with Vibration

Industrial & Engineering Chemistry Research, 2016
Vibrating a bubble column reactor can increase the gas holdup (void fraction), as well the mass-transfer rate. Since the seminal work in the 1960s, there has been minimal effort focused on this topic until the early 2000s. Currently there are several groups studying this problem making advancements in our fundamental understanding of the process with ...
Brian R. Elbing, Adam L. Still, Afshin J. Ghajar   +2 more
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