Broadband planar nearfield acoustic holography based on one-third-octave band analysis
2016 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 109, 18-26 p.Article in journal (Refereed) PublishedText
Planar nearfield acoustic holography (PNAH) is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In this paper a method, broadband planar nearfield acoustic holography based on one-third-octave band analysis (BPNAH), is described. Data relating to the complex band pressure on the hologram is obtained by combining the root-mean-square pressure corresponding to a one-third-octave band with the phase of the pressure corresponding to a single frequency line. Numerical simulations and measurements show that the BPNAH method allows a significant reduction in processing time, while keeping a similar accuracy to the conventional reconstruction, which is based on the summation of frequency by frequency in the corresponding band. As a simple, time-saving and robust technique, the BPNAH method is particularly well adapted to industrial studies.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 109, 18-26 p.
Frequency analysis, Narrow-band, Nearfield acoustic holography, One-third-octave band
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-186902DOI: 10.1016/j.apacoust.2016.02.002ISI: 000377232400003ScopusID: 2-s2.0-84959489844OAI: oai:DiVA.org:kth-186902DiVA: diva2:931270
QC 201605272016-05-272016-05-162016-06-28Bibliographically approved