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http://dx.doi.org/10.7776/ASK.2009.28.3.260

Design of Acoustic Source Array Using the Concept of Holography Based on the Inverse Boundary Element Method  

Cho, Wan-Ho (KAIST 기계공학과 소음 및 진동제어 연구센터)
Ih, Jeong-Guon (KAIST 기계공학과 소음 및 진동제어 연구센터)
Publication Information
The Journal of the Acoustical Society of Korea / v.28, no.3, 2009 , pp. 260-267 More about this Journal
Abstract
It is very difficult to form a desired complex sound field at a designated region precisely as an application of acoustic arrays, which is one of important objects of array systems. To solve the problem, a filter design method was suggested, which employed the concept of an inverse method using the acoustical holography based on the boundary element method. In the acoustical holography used for the source identification, the measured field data are employed to reconstruct the vibro-acoustic parameters on the source surface. In the analogous problem of source array design, the desired field data at some specific points in the sound field was set as constraints and the volume velocity at the surface points of the source plane became the source signal to satisfy the desired sound field. In the filter design, the constraints for the desired sound field are set, first. The array source and given space are modelled by the boundary elements. Then, the desired source parameters are inversely calculated in a way similar to the holographic source identification method. As a test example, a target field comprised of a quiet region and a plane wave propagation region was simultaneously realized by using the array with 16 loudspeakers.
Keywords
Acoustical holography; Inverse method; Source array; Rendering of sound field;
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