Twin broadband waveform generation using a nonlinear acoustic source

1996 ◽  
Vol 100 (4) ◽  
pp. 2582-2582
Author(s):  
Kurt Metzger ◽  
Ted Birdsall
Keyword(s):  
Acoustic Source ◽  
Waveform Generation ◽  
Nonlinear Acoustic

Source parameters for the numerical simulation of lightning as a nonlinear acoustic source

2014 ◽  
Vol 136 (4) ◽  
pp. 2223-2223
Author(s):  
Andrew Marshall ◽  
Neal Evans ◽  
Chris Hackert ◽  
Karl Oelschlaeger
Keyword(s):  
Numerical Simulation ◽  
Source Parameters ◽  
Acoustic Source ◽  
Nonlinear Acoustic

Nonlinear Influence of Sound on the Vibrational Energy of Molecules in a Relaxing Gas

2012 ◽  
Vol 37 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Anna Perelomova
Keyword(s):  
High Frequency ◽  
Degrees Of Freedom ◽  
Vibrational Energy ◽  
Acoustic Energy ◽  
Acoustic Source ◽  
Weakly Nonlinear ◽  
Dispersive Flow ◽  
Nonlinear Character ◽  
Nonlinear Acoustic ◽  
Relaxing Gas

AbstractDynamics of a weakly nonlinear and weakly dispersive flow of a gas where molecular vibrational relaxation takes place is studied. Variations in the vibrational energy in the field of intense sound is considered. These variations are caused by a nonlinear transfer of the acoustic energy into energy of vibrational degrees of freedom in a relaxing gas. The final dynamic equation which describes this is instantaneous, it includes a quadratic nonlinear acoustic source reflecting the nonlinear character of interaction of high-frequency acoustic and non-acoustic motions in a gas. All types of sound, periodic or aperiodic, may serve as an acoustic source. Some conclusions about temporal behavior of the vibrational mode caused by periodic and aperiodic sounds are made.

Generation of vorticity motion by sound in a chemically reacting gas and inversion of acoustic streaming in the non-equilibrium regime

Open Physics ◽  
2011 ◽  
Vol 9 (3) ◽  
Author(s):  
Anna Perelomova ◽  
Paweł Wojda
Keyword(s):  
Acoustic Streaming ◽  
Mean Flow ◽  
Acoustic Source ◽  
The Mean ◽  
Nonlinear Acoustic ◽  
Chemically Reacting ◽  
And Inversion ◽  
Equilibrium Chemical ◽  
Stimulation Of ◽  
Non Equilibrium

AbstractNonlinear stimulation of the vorticity mode caused by losses in the momentum of sound in a chemically reacting gas is considered. The instantaneous dynamic equation for the vorticity mode is derived. It includes a quadratic nonlinear acoustic source, which reflects the fact that the reason for the interaction between sound and the vorticity mode is nonlinear. Both periodic and aperiodic sound may be considered as the origin of the vorticity flow. The equation governing the mean flow (the acoustic streaming) in the field of periodic sound is also derived. In the non-equilibrium regime of a chemical reaction, there may exist streaming vortices whose direction of rotation is opposite to that of the vortices in the standard thermoviscous flows. For periodic sound, this is illustrated by an example. The theory and the example describe both equilibrium and non-equilibrium chemical reactions.

Sign in / Sign up

Export Citation Format

Share Document