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Experimental study of repeatability errors in 3D sound intensity measurements in narrow frequency bands
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0001-5435-2069
1994 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 43, no 2, p. 95-111Article in journal (Refereed) Published
Abstract [en]

When investigating the 2D or 3D intensity of complex ‘real life’ noise sources, rather than the intensity normal to a surface, to obtain more detailed information about the radiated sound field great care has to be taken both in measuring and in interpreting the results. In this study it is shown that in measurements of 3D intensity for fixed points and in narrow frequency bands, large errors can be expected for a well-defined simple source if the positioning is imprecise and for a complex source even if the positioning device and the probe are of highest quality. Comparisons have been made between a two-microphone and a six-microphone probe, hand-held and robot-controlled. The comparisons show that, except for the case of an ideal measurement with a simple source and a high-precision robot, significant errors can be expected for all the tested measurement cases. The measurements also show that the positioning of the microphone is of major importance for the repeatability accuracy. The accuracy obtained with a 3D-probe is notably better than with a 1D-probe. The errors when measuring the complex source with a robot-controlled 3D-probe, however, are still so high, especially for the non-dominant directions, that interpretations have to be made with great care. Under non-ideal measurement conditions, the errors are found to be exponentially dependent upon the sound field pressure/intensity relationship (the pI-index).

Place, publisher, year, edition, pages
1994. Vol. 43, no 2, p. 95-111
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-5746DOI: 10.1016/0003-682X(94)90054-XISI: A1994PE70100001Scopus ID: 2-s2.0-0028563414Local ID: 3ed44680-6fe3-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-5746DiVA, id: diva2:978621
Note
Godkänd; 1994; 20060928 (biem)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Ågren, AndersJohansson, Örjan

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