Used in Acoustic Projects Calculation of Reflection Coefficient for End Opening of Channel without Flange

2017 ◽  
Vol 6 (3) ◽  
pp. 34-41
Author(s):  
Владимир Тупов ◽  
Vladimir Tupov ◽  
А. Миронова ◽  
A. Mironova
Keyword(s):  
Reflection Coefficient ◽  
Error Analysis ◽  
Plane Waves ◽  
Computational Error ◽  
Sound Waves ◽  
Computer Approach ◽  
Coefficient Of Reflection ◽  
Plane Sound ◽  
Opening Channel

The computational error analysis for coefficient of reflection of plane sound waves at the end of opening channel without flange performed by means of formulas commonly used in practice has demonstrated their unacceptability for accurate acoustic calculations, and limitations of the Helmholtz numbers’ range, where these formulas are applicable. In this work have been proposed calculated dependences, convenient for practical usage and enabling more accurately calculate by computer approach the considered quantity’s values in a whole range of existence of the plane waves in the channel.

Plane Sound Waves

2020 ◽  
pp. 43-57
Author(s):  
Anatoly Kistovich ◽  
Konstantin Pokazeev ◽  
Tatiana Chaplina
Keyword(s):  
Sound Waves ◽  
Plane Sound

PLANE SOUND WAVES OF SMALL AMPLITUDE IN A GAS-DUST MIXTURE WITH POLYDISPERSE PARTICLES

2021 ◽  
Vol 62 (4) ◽  
pp. 663-672
Author(s):  
T. V. Markelova ◽  
M. S. Arendarenko ◽  
E. A. Isaenko ◽  
O. P. Stoyanovskaya
Keyword(s):  
Small Amplitude ◽  
Sound Waves ◽  
Plane Sound ◽  
Polydisperse Particles

Plane Sound Waves of Low Amplitude in a Gas-Dust Environment with Polydispersed Particles

2021 ◽  
Vol 62 (4) ◽  
pp. 158-168
Author(s):  
T. V. Markelova ◽  
M. S. Arendarenko ◽  
E. A. Isaenko ◽  
O. P. Stoyanovskaya
Keyword(s):  
Sound Waves ◽  
Plane Sound ◽  
Low Amplitude

Plane Sound Waves on Boundaries

1983 ◽  
pp. 23-45
Author(s):  
Josef Krautkrämer ◽  
Herbert Krautkrämer
Keyword(s):  
Sound Waves ◽  
Plane Sound

Sound Propagation in Dilute Polyatomic Gases

1972 ◽  
Vol 27 (4) ◽  
pp. 583-592
Author(s):  
H. Moraal ◽  
F. Mccourt
Keyword(s):  
Pressure Range ◽  
Sound Propagation ◽  
Plane Waves ◽  
Point Of View ◽  
Perturbation Function ◽  
Sound Waves ◽  
Polyatomic Gas ◽  
Measured Pressure ◽  
Theory And Experiment ◽  
Good Agreement

Abstract Sound propagation in dilute pure gases, both monatomic and polyatomic, has been considered from the point of view of the Waldmann-Snider equation. It is shown that the commonly employed assumption that sound propagation in gases is equivalent to the propagation of plane waves is valid only in the region where collisions restore equilibrium faster than it is perturbed by the sound waves. A systematic truncation procedure for an expansion of the perturbation function in irreducible Cartesian tensors is introduced and then illustrated in solutions for three specific kinds of molecules, helium, nitrogen and rough spheres. The agreement between theory and experiment is rather good for sound absorption in the region where the ratio of the collision and sound frequencies is greater than 1.5. The agreement in the case of dispersion is good over the whole measured pressure range. One useful result obtained is to show the polyatomic gas calculations in second approximation have as good agreement with experiment as the calculations for noble gases in third approximation. This can be related to the possession by the polyatomic gas of a bulk viscosity which dominates in sound propagation.

scholarly journals On the acoustic disturbances produced by small bodies in plane waves transmitted through water, with special reference to the single-plate direction finder

1921 ◽  
Vol 100 (704) ◽  
pp. 261-288
Keyword(s):  
Special Reference ◽  
Plane Waves ◽  
Maximum Amplitude ◽  
Sound Waves ◽  
Small Bodies ◽  
Acoustic Disturbances ◽  
Sense Of Direction ◽  
Single Plate ◽  
Direction Finder ◽  
Metal Diaphragm

The experiments to be described were carried out for the Board of Invention and Research, under the direction of Sir William Bragg, between October 1916 and February 1917, on the Cullaloe Reservoir, near Aberdour, Fifeshire, and are now published with the permission of the Admiralty. A form of directional hydrophone has already been described by Sir William Bragg. It consists of a metal diaphragm, A, about four inches in diameter, mounted in a heavy ring, B, and open to the water on both sides ( vide Chart 9). In the centre of the diaphragm is a small metal box, C, carrying a carbon granule microphone of the button type. The microphone is connected into an ordinary telephone circuit. If the instrument is rotated about a vertical diameter in water through which sound waves are passing the sound heard in the receivers passes through a number of maxima and minima. When the diaphragm is turned “edge-on” to the source of sound it is obvious that the pressure pulses will reach the two faces of the diaphragm symmetrically and the diaphragm will fail to vibrate. As, however, either face is turned toward the source this symmetry ceases to exist and the diaphragm is thrown into vibration, which reaches a maximum amplitude when the instrument is “broad-side” on to the source. The instrument, therefore, indicates the line of propagation of the sound, but owing to the existence of two positions of maximum or minimum its indications are ambiguous as regards the sense of direction.

Reflection of Electromagnetic Waves from Multiferroic TbMnO3

2012 ◽  
Vol 77 ◽  
pp. 225-230
Author(s):  
Igor V. Bychkov ◽  
Dmitry A. Kuzmin ◽  
Sergei J. Lamekhov ◽  
Leonid N. Butko ◽  
Vladimir G. Shavrov
Keyword(s):  
Reflection Coefficient ◽  
Electromagnetic Waves ◽  
Band Gaps ◽  
Electromagnetic Interactions ◽  
Coefficient Of Reflection

Reflection coefficient of electromagnetic waves from TbMnO3 surface with sinusoidal structure and permittivity are examined. Model of material with spin, elastic and electromagnetic interactions used. Resonance kind of reflection coefficient and of permittivity was shown. Found spectrum and reasoned existing of band-gaps in coefficient of reflection.

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