Determination of sound reduction indices in the presence of flanking transmission

Zyl, B. G. van; Erasmus, Pieter J.; Merwe, G.J.J. van der

doi:10.1016/0003-682x(86)90013-7

Cited by 6 publications

(1 citation statement)

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“…Van Zyl et al have shown that the sound intensity method can be used in flanking environments where the conventional method fails totally, provided that the measurement surface encloses nothing but the specimen. 18 This paper describes an example of a ''low cost'' laboratory facility for sound insulation measurements based on the sound intensity method and robot technology. The properties of the automatic robot system are discussed and approximate specifications are described.…”

Section: Introductionmentioning

confidence: 99%

Test procedure and automatic system for sound insulation measurement using the sound intensity method

Hongisto¹,

Nieminen²,

Koskela³

et al. 1997

Noise Control Eng. J.

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A test procedure has been developed for sound insulation measurements using the sound intensity method. The basis of the procedure is from international standards ISO 140-3 and ISO 9614-1. For specimens that are sound absorbing on the receiving room side, the transmitted intensity will be underestimated if the extraneous sound intensity "caused by flanking or sound leaks… is high. A flanking ratio check is included in the test procedure to maintain accuracy within desired limits. The consideration of the field nonuniformity indicator, F 4 , in the test procedure was also found necessary. Seals at the edges of movable components of sound isolating structures, for example doors, are often poorly designed and manufactured. Sound leaks increase the value of the field indicator F 4 because of inhomogeneous sound transmission. Improving the seal of finished products is not possible in the test situation. For F 4 to fall in the acceptable range the number of measurement points may have to be increased enormously. The test procedure can be applied both to laboratory and field measurements. The main advantage of the new sound intensity method is the ability to locate sound leaks in the test object. This allows a customer-friendly mechanism for product development. Another advantage is that the laboratory facility can be much lighter than for the conventional method while maintaining the same limit for the maximum measurable sound reduction index. An automatic two-dimensional robot scanning system was used for exact positioning of the intensity probe. © 1997 Institute of Noise Control Engineering. †S0736-2501"97…00502-X ‡

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Section: Introductionmentioning

confidence: 99%