Determination of transmission loss of materials from array measurements using nearfield acoustical holography/inverse boundary element methods in a transmission loss facility

2005 ◽  
Vol 118 (3) ◽  
pp. 1885-1885
Author(s):  
Earl G. Williams ◽  
Nicolas Valdivia ◽  
Peter Herdic ◽  
Jacob Klos ◽  
Daniel Palumbo ◽  
...  
Keyword(s):  
Boundary Element ◽  
Transmission Loss ◽  
Boundary Element Methods ◽  
Inverse Boundary ◽  
Array Measurements ◽  
Acoustical Holography ◽  
Nearfield Acoustical Holography

Identification of Incoherent Noise Sources

2001 ◽  
Author(s):  
S. T. Raveendra ◽  
S. Sureshkumar
Keyword(s):  
Boundary Element ◽  
Sound Pressure ◽  
Partial Coherence ◽  
Noise Sources ◽  
Reconstruction Procedure ◽  
Pressure Fields ◽  
Acoustical Holography ◽  
Nearfield Acoustical Holography ◽  
Source Geometry ◽  
Incoherent Noise

Abstract A Nearfield Acoustical Holography (NAH) technique that is applicable to the identification of multiple, incoherent noise sources from measured sound pressure fields are described. Initially, a partial coherence approach is adopted to decouple an incoherent acoustic field into a set of fully coherent, mutually incoherent partial fields. Subsequently, NAH is applied individually to each coherent partial field to reconstruct the corresponding source field. A boundary element based NAH reconstruction procedure is utilized so that the technique is valid for arbitrary source geometry. The process is validated by identifying the sources in a two-speaker system that was driven by independent signal generators.

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