On the relationship between acoustic energy density flux near the jet and far field acoustic intensity

1973 ◽  
Author(s):  
L. MAESTRELLO
Keyword(s):  
Energy Density ◽  
Acoustic Energy ◽  
Far Field ◽  
Acoustic Intensity ◽  
The Relationship ◽  
Acoustic Energy Density

An Energy Boundary Element Formulation for Predicting the Acoustic Field Around a Vehicle at High Frequencies Due to Airborne Noise Sources

2003 ◽  
Author(s):  
Aimin Wang ◽  
Nickolas Vlahopoulos ◽  
Jason Zhu ◽  
Mike Qian
Keyword(s):  
Energy Density ◽  
Boundary Element ◽  
Acoustic Field ◽  
Test Data ◽  
Acoustic Energy ◽  
Element Formulation ◽  
Acoustic Intensity ◽  
Numerical Predictions ◽  
Airborne Noise ◽  
Acoustic Energy Density

An Energy Boundary Element Analysis (EBEA) formulation is presented for calculating sound radiation from a source with arbitrary shape at high frequency. The basic integral equation for the EBEA is derived including a half-space boundary condition. The time and frequency averaged acoustic energy density and acoustic intensity constitutes the primary variables of the new formulation, and the corresponding Green’s functions are derived. The governing equations for the EBEA are established and the numerical formulae for the coefficients of the system matrix, the acoustic energy density, and the acoustic intensity are derived using a Gaussian quadrature. The EBEA formulation and the corresponding numerical implementation are validated by comparing EBEA results to test data for the acoustic field around a vehicle that originates from an airborne noise source. Good correlation is demonstrated between numerical predictions and test data.

An adaptive equalization scheme using acoustic energy density

2004 ◽  
Vol 115 (5) ◽  
pp. 2612-2612
Author(s):  
Xi Chen ◽  
Scott D. Sommerfeldt ◽  
Timothy W. Leishman
Keyword(s):  
Energy Density ◽  
Acoustic Energy ◽  
Adaptive Equalization ◽  
Acoustic Energy Density

scholarly journals System for the measurement of acoustic energy density

1976 ◽  
Vol 60 (S1) ◽  
pp. S59-S59
Author(s):  
Bruce L. Morton ◽  
Elmer L. Hixson
Keyword(s):  
Energy Density ◽  
Acoustic Energy ◽  
Acoustic Energy Density
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