A sound power measurement technique optimised for low-speed fan tones

Autor:	Timothy J. Newman, Ludovic Desvard, Ann P. Dowling, Anurag Agarwal
Rok vydání:	2016
Předmět:	Acoustics and Ultrasonics Anechoic chamber Standardization Computer science Acoustics Aerospace Engineering Aerodynamics Sound power 01 natural sciences 010305 fluids & plasmas Modal 0103 physical sciences Broadband Aeroacoustics Sound quality 010301 acoustics
Zdroj:	International Journal of Aeroacoustics. 15:59-80
ISSN:	2048-4003 1475-472X
DOI:	10.1177/1475472x16630667
Popis:	Air-moving devices such as fans are routinely characterised experimentally in terms of their sound power, and sound quality which depends on both broadband and tonal noise levels. The International Organization for Standardization method 5136, widely used in industry and academia, estimates sound power in third-octave bands radiated into a duct. Since the International Organization for Standardization method is not designed for tone measurements and overlooks the unevenness of the modal power distribution, an extended method has been developed and implemented based on mode decomposition. The ‘two-port’ source model is formulated to include higher-order modes and applied for the first three modes which require six independent stationary measurements on each side or ‘port’. The resulting experimental rig is much shorter than the International Organization for Standardization rig and does not require anechoic terminations. Both methods have been used to characterise the same fan, and the results compared to understand tone measurement shortfall of the International Organization for Standardization rig.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6b36ecc4280d0d0f7cf9d50fc0c2b0cd https://doi.org/10.1177/1475472x16630667 Zobrazit plný text záznamu Plný text ve formátu PDF