scholarly journals Sound emission and annihilations in a programmable quantum vortex collider

Nature ◽  
2021 ◽  
Vol 600 (7887) ◽  
pp. 64-69
Author(s):  
W. J. Kwon ◽  
G. Del Pace ◽  
K. Xhani ◽  
L. Galantucci ◽  
A. Muzi Falconi ◽  
...  
Keyword(s):  
Sound Emission ◽  
Quantum Vortex

Hydrodynamic instability and shear layer effect on the sound emission of a turbulent jet flame

2015 ◽  
Author(s):  
Stephan Schlimpert ◽  
Seong Ryong Koh ◽  
Antje Feldhusen ◽  
Benedikt Roidl ◽  
Matthias H. Meinke ◽  
...  
Keyword(s):  
Shear Layer ◽  
Hydrodynamic Instability ◽  
Turbulent Jet ◽  
Sound Emission ◽  
Jet Flame ◽  
Layer Effect

scholarly journals Vibration Analysis of the Human Left Ventricular Posterobasal Wall at the Moment of the First Heart Sound Emission.

1991 ◽  
Vol 164 (2) ◽  
pp. 125-144 ◽  
Author(s):  
YOSHIRO KOIWA ◽  
TADASU OHYAMA ◽  
TAKEHIKO TAKAGI ◽  
JUN-ICHI KIKUCHI ◽  
HIDEYUKI HONDA ◽  
...  
Keyword(s):  
Vibration Analysis ◽  
Heart Sound ◽  
Left Ventricular ◽  
Sound Emission ◽  
First Heart Sound ◽  
The Moment

scholarly journals Numerical Simulation of Breathing Mode Oscillation on Bubble Detachment

Fluids ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 96
Author(s):  
Takao Oku ◽  
Hiroyuki Hirahara ◽  
Tomohiro Akimoto ◽  
Daiki Tsuchida
Keyword(s):  
Natural Frequency ◽  
Cfd Simulation ◽  
Low Frequency ◽  
Sound Emission ◽  
Breathing Mode ◽  
Bubble Deformation ◽  
Mode Oscillation ◽  
Computational Fluid Dynamics Cfd ◽  
Oscillation Frequencies ◽  
Air Column

When a bubble detaches from a nozzle immersed in water, a sound is emitted owing to the detachment. The bubble deformation and sound emission generated after detachment has been investigated in many studies, in which the breathing mode with a natural frequency was discussed based on the dynamics of the interface between the air and water. In this study, the deformation of a bubble was observed, and the sound emitted upon detachment was measured experimentally. To analyze the bubble deformation process, a computational fluid dynamics (CFD) simulation was conducted using the volume of fluid (VOF) method to predict the sound emission. In the analysis, the deformation behavior, the oscillation frequencies, sound pressure, and radius variation were discussed by comparing the numerical and experimental data. Furthermore, the natural frequency and low frequency vibrations were discussed based on the interference between the detached bubbles and the air column vibrations.

Sound emission from boiling on a submerged wire

1971 ◽  
Vol 49 (3) ◽  
pp. 309-313 ◽  
Author(s):  
C. P. Haigh ◽  
A. B. Ponter
Keyword(s):  
Sound Emission

scholarly journals Phase dynamics of periodic waves leading to the Kadomtsev–Petviashvili equation in 3+1 dimensions

2015 ◽  
Vol 471 (2178) ◽  
pp. 20150137 ◽  
Author(s):  
Daniel J. Ratliff ◽  
Thomas J. Bridges
Keyword(s):  
Phase Modulation ◽  
Space Dimension ◽  
Travelling Waves ◽  
Wave Action ◽  
Periodic Waves ◽  
Kp Equation ◽  
Modulation Equation ◽  
Phase Dynamics ◽  
Quantum Vortex ◽  
Petviashvili Equation

The Kadomstev–Petviashvili (KP) equation is a well-known modulation equation normally derived by starting with the trivial state and an appropriate dispersion relation. In this paper, it is shown that the KP equation is also the relevant modulation equation for bifurcation from periodic travelling waves when the wave action flux has a critical point. Moreover, the emergent KP equation arises in a universal form, with the coefficients determined by the components of the conservation of wave action. The theory is derived for a general class of partial differential equations generated by a Lagrangian using phase modulation. The theory extends to any space dimension and time, but the emphasis in the paper is on the case of 3+1. Motivated by light bullets and quantum vortex dynamics, the theory is illustrated by showing how defocusing NLS in 3+1 bifurcates to KP in 3+1 at criticality. The generalization to N >3 is also discussed.

Influence of vehicle source directivity in Japanese and European outdoor sound prediction models under a semi-finite thick barrier configuration

2021 ◽  
Vol 263 (1) ◽  
pp. 5147-5153
Author(s):  
Takuya Oshima ◽  
Fumiya Takeda ◽  
Yumi Kurosaka
Keyword(s):  
Noise Level ◽  
Prediction Models ◽  
Combined Effect ◽  
Sound Emission ◽  
Sound Levels ◽  
Thick Barrier ◽  
Source Directivity

The Japanese ASJ RTN-Model 2018, European Harmonoise and CNOSSOS-EU outdoor sound prediction models are respectively known to have symmetric, asymmetric and omnidirectional sound emission directivities along front-back direction of the source vehicle. However, the influence of such difference in directivities to final predicted sound levels has not been investigated much. In this study, the influence is investigated using the ASJ Model and the Harmonoise under a configuration of semi-finite thick barrier along a source road. The configuration is an idealization of Japanese roadside buildings that have gaps in between, unlike European buildings that continuously extend over a whole urban block. Under the configuration, distribution of A-weighted sound levels around the end face of the barrier are computed with and without source directivity taken into account by each model. It is found from the results that the source directivity of the ASJ model makes little difference in the noise level distribution. In contrast, the source directivity of Harmonoise is found to make differences of 0.5-0.8 dB at right behind the barrier depending on vehicle running direction. However, a combined effect of source directivity and reflection at the end face is found to be negligible.

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