The intensity of the field generated by a point source and reflected from a rough surface

Maximov, G. A.; Larichev, V. A.; Khoroshenkov, K. V.

doi:10.1134/s1063771012020133

Cited by 2 publications

(1 citation statement)

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“…A sound source model above an infinitely large floor was designed to study the errors in sound power determination based on both sound pressure and sound intensity measurements [Suz07]. The reflection from a rough surface was considered for the theoretical calculation of the sound intensity of a monopole source [Max12]. The effect of a reflecting plane on the calibration of a reference sound source was experimentally and theoretically investigated by Yamada [Yam15].…”

Section: State-of-the-art In Sound Power Measurementsmentioning

confidence: 99%

Investigation on the dissemination of unit watt in airborne sound and applications

Brezas¹

2019

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Sound power is a widely applied quantity for the characterization of sound sources. Its determination is based on measurements of sound field quantities. Despite the state-of-the art measurement techniques, the sound power determination has some disadvantages. Most significant is the low frequency limitation, with different measurement methods leading to different results, which are expressed in broad frequency bands. A new method is proposed towards the establishment of traceability in airborne sound power. The realization of a primary source enables the free field sound power to be determined. The study investigates the dissemination process by which the sound power of a device under test can be referred to its free field sound power. In addition, the related uncertainty can be explicitly determined. The method of choice is the substitution method, which has been investigated both theoretically and experimentally. Apart from the well-established sound pressure measurements, the implementation of the substitution method also includes sound intensity measurements. The theoretical investigation focuses on the different positioning of the sources used in the substitution method, the substitution of sources of different radiation order and the existence of an impedance boundary. The sound power of aerodynamic reference sound sources has been examined since this type of source has been chosen to be the required transfer standard. For the measurements a specially designed scanning apparatus has been used. Sound power determination in calibration conditions and in situ has been performed. The required correction has been derived and successfully compared to an existing one. Sound pressure and sound intensity measurements at realistic environments have taken place and their sound power has been determined by applying the dissemination process. The sound power determination includes both narrow and broadband analysis along with a transparent uncertainty budget for the spectrum from 20 Hz to 10 kHz. After the geometric near field, the far field starts and may extend to infinity. In this field the particle velocity and sound intensity have only radial components, and sound pressure and particle velocity are spatial angular [Fah95]. The far field exists when three criteria related to the distance approximately from the source, the wavelength and the characteristic source dimension are fulfilled [Bie03]. In the far field, the sound power can be determined along with the directivity. These two quantities can fully describe a sound source in terms of its radiated energy. This comes in contradiction to the characterization of the source based only to its characteristics. To overcome this contradiction, the present study proposes the characterization of the sound source based on its free field sound power, which is independent from the acoustic environment. Anechoic or hemianechoic rooms are qualified chambers, where free field occurs. In spite of determining sound power in such rooms, it is not possible for any source of intere...

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Section: State-of-the-art In Sound Power Measurementsmentioning

confidence: 99%

Investigation on the dissemination of unit watt in airborne sound and applications

Brezas¹

2019

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Numerical simulation of Bragg scattering of sound by surface roughness for different values of the Rayleigh parameter

et al. 2014

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The intensity of the field generated by a point source and reflected from a rough surface

Cited by 2 publications

References 0 publications

Investigation on the dissemination of unit watt in airborne sound and applications

Investigation on the dissemination of unit watt in airborne sound and applications

Numerical simulation of Bragg scattering of sound by surface roughness for different values of the Rayleigh parameter

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