Comparison of Fourier-transform based and statistically optimized near-field acoustical holography in terms of their applicability to active structural acoustic control

Publication date
2026
Document type
Konferenzbeitrag
Author
Organisational unit
DOI
URI
Conference
52. Jahrestagung für Akustik (DAGA 2026) ; Dresden ; 23.–26. März 2026
Project
Publisher
Deutsche Gesellschaft für Akustik e.V. (DEGA)
Book title
Fortschritte der Akustik - DAGA 2026
First page
70
Last page
73
Part of the university bibliography
✅
Language
English
DDC Class
534 Schall und verwandte Schwingungen
530 Physik
Keyword
Structural vibration
Acoustics
Microphone array
Nearfield acoustical holography
Statistically Optimized Near-field Acoustical Holography
Discrete Fourier Transform
Angular spectrum method
Abstract
In order to make the acoustic sound power observable during active structural acoustic control, two algorithms from planar near-field acoustical holography are compared. These are Fourier transform-based near-field acoustical holography and statistically optimized near-field acoustical holography (SONAH). The derivation of both using DFT matrices and their subsequent application to the sound radiation of an acoustic line source model reveals situations in which both algorithms are equivalent. The holographic approach approximates a solution to the inverse and ill-posed sound field reconstruction scenario of estimating sound field quantities in a source plane by evaluating sound pressures in a holographic plane. The sound power is deduced from the inversely reconstructed sound field quantities available at the source plane. The applicability of the holographic approach as a sensor concept for active structural acoustic control is discussed.
Version
Published version
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Metadata only access