Classical Electrodynamics and Acoustics, Part 2: Sound Radiation by Moving Quadrupoles

1999 ◽  
Vol 121 (1) ◽  
pp. 126-130 ◽  
Author(s):  
G. C. Gaunaurd ◽  
T. J. Eisler
Keyword(s):  
Sound Radiation ◽  
Classical Electrodynamics ◽  
Radiation Patterns

Our earlier work in Part 1 of this paper [1] is here extended to quadrupole distributions and point quadrupoles (i.e., stresses) in arbitrary motion. Radiation patterns are obtained and displayed in many relevant cases.

Classical Electrodynamics and Acoustics: Sound Radiation by Moving Multipoles

1997 ◽  
Vol 119 (2) ◽  
pp. 271-282 ◽  
Author(s):  
G. C. Gaunaurd ◽  
T. J. Eisler
Keyword(s):  
Dirac Equation ◽  
Free Field ◽  
Sound Radiation ◽  
Equation Of Motion ◽  
Rotating Machinery ◽  
Classical Electrodynamics ◽  
Radiation Patterns ◽  
Frequency Distributions ◽  
Acoustic Sources ◽  
Power Radiation

In classical electrodynamics (CED) P. Dirac used the average of retarded and advanced fields to represent the bound field and their difference to represent the free field in his derivation of the (Lorentz-Dirac) equation of motion for an electron. The latter skew-symmetric combination filtered out the radiation part of the field. It can also be used to derive many properties of the power radiated by acoustic sources, such as angular and frequency distributions. As in CED there is radiation due to source acceleration and radiation patterns exhibit the “headlight effect.” Power radiation patterns are obtained by this approach for point multipoles undergoing various motions. Applications to sound radiation problems from rotating machinery are shown. Numerous computed plots illustrate all cases.

Non-impulsive signal deconvolution for computation of violin sound radiation patterns and applications in sound synthesis

2015 ◽  
Vol 138 (3) ◽  
pp. 1785-1785
Author(s):  
Alfonso Perez Carrillo ◽  
Jordi Bonada ◽  
Vesa Valimaki ◽  
Andres Bucci ◽  
Jukka Patynen
Keyword(s):  
Sound Radiation ◽  
Sound Synthesis ◽  
Radiation Patterns ◽  
Signal Deconvolution
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