A six sensor method for measuring acoustic properties in ducts

Newman, T. J.; Agarwal, Anurag; Dowling, Ann P.; Desvard, Ludovic; Stimpson, Ryan

doi:10.1121/1.4799439

Cited by 2 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mode decomposition theory is presented next in a new compact form amenable to optimisation of the locations of the measurements. Subsequently, a novel location optimisation procedure is implemented which gives the set-up shown in ‘New rig design’ section (as published by the authors 14 ).…”

Section: Mode Decompositionmentioning

confidence: 99%

“…17 However, the minimum number of measurement locations (in this case six) is optimised here, as published by the authors. 14…”

Section: Mode Decompositionmentioning

confidence: 99%

“…17 However, the minimum number of measurement locations (in this case six) is optimised here, as published by the authors. 14 In order to optimise the locations of the six pressure measurements over a wide frequency range, an optimisation scheme has been developed in MATLAB. This tests every possible combination of azimuthal angles with six measurement locations equally split between planes at two axial locations x A , x B (for ease of construction).…”

Section: Mode Decompositionmentioning

confidence: 99%

See 2 more Smart Citations

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

Newman

Agarwal

Dowling

et al. 2016

International Journal of Aeroacoustics

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Mode Decompositionmentioning

confidence: 99%

“…17 However, the minimum number of measurement locations (in this case six) is optimised here, as published by the authors. 14…”

Section: Mode Decompositionmentioning

confidence: 99%