Some measurements of sound intensity in air flow

Frank J. Fahy; Tapio Lahti; Phil Joseph

Some measurements of sound intensity in air flow

Frank J. Fahy
, Tapio Lahti
, Phil Joseph

VTT Technical Research Centre of Finland

VTT (former employee or external)

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

Abstract

In this paper, some results are presented of measurements made in mean air flows of speeds up to about 25 m/s in an open circuit wind tunnel having a lowest cut off frequency of 1143 Hz: the frequency range investigated is 200-5000 Hz, which includes higher order mode propagation. Initial assessment of the Z-probe, in which two half inch CE condenser microphones are placed 15 mm apart in a coaxial, streamlined, cylindrical body, have produced promising results. The current design would be quite suitable for in situ measurements in operational low speed heating and ventilation systems for the determination of fan sound power and attenuator performance.

Original language	English
Title of host publication	2nd International congress on acoustic intensity
Place of Publication	Senlis
Publisher	Centre Technique des Industries Mécaniques (CETIM)
Number of pages	8
ISBN (Print)	978-2-85400-054-2
Publication status	Published - 1985
MoE publication type	B3 Non-refereed article in conference proceedings
Event	2nd International Congress on Acoustic Intensity - Paris, France Duration: 23 Sept 1985 → 26 Sept 1985

Conference

Conference	2nd International Congress on Acoustic Intensity
Country/Territory	France
City	Paris
Period	23/09/85 → 26/09/85

Cite this

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title = "Some measurements of sound intensity in air flow",

abstract = "In this paper, some results are presented of measurements made in mean air flows of speeds up to about 25 m/s in an open circuit wind tunnel having a lowest cut off frequency of 1143 Hz: the frequency range investigated is 200-5000 Hz, which includes higher order mode propagation. Initial assessment of the Z-probe, in which two half inch CE condenser microphones are placed 15 mm apart in a coaxial, streamlined, cylindrical body, have produced promising results. The current design would be quite suitable for in situ measurements in operational low speed heating and ventilation systems for the determination of fan sound power and attenuator performance.",

author = "Fahy, \{Frank J.\} and Tapio Lahti and Phil Joseph",

year = "1985",

language = "English",

isbn = "978-2-85400-054-2",

booktitle = "2nd International congress on acoustic intensity",

publisher = "Centre Technique des Industries M{\'e}caniques (CETIM)",

address = "France",

note = "2nd International Congress on Acoustic Intensity ; Conference date: 23-09-1985 Through 26-09-1985",

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TY - GEN

T1 - Some measurements of sound intensity in air flow

AU - Fahy, Frank J.

AU - Lahti, Tapio

AU - Joseph, Phil

PY - 1985

Y1 - 1985

N2 - In this paper, some results are presented of measurements made in mean air flows of speeds up to about 25 m/s in an open circuit wind tunnel having a lowest cut off frequency of 1143 Hz: the frequency range investigated is 200-5000 Hz, which includes higher order mode propagation. Initial assessment of the Z-probe, in which two half inch CE condenser microphones are placed 15 mm apart in a coaxial, streamlined, cylindrical body, have produced promising results. The current design would be quite suitable for in situ measurements in operational low speed heating and ventilation systems for the determination of fan sound power and attenuator performance.

AB - In this paper, some results are presented of measurements made in mean air flows of speeds up to about 25 m/s in an open circuit wind tunnel having a lowest cut off frequency of 1143 Hz: the frequency range investigated is 200-5000 Hz, which includes higher order mode propagation. Initial assessment of the Z-probe, in which two half inch CE condenser microphones are placed 15 mm apart in a coaxial, streamlined, cylindrical body, have produced promising results. The current design would be quite suitable for in situ measurements in operational low speed heating and ventilation systems for the determination of fan sound power and attenuator performance.

M3 - Conference article in proceedings

SN - 978-2-85400-054-2

BT - 2nd International congress on acoustic intensity

PB - Centre Technique des Industries Mécaniques (CETIM)

CY - Senlis

T2 - 2nd International Congress on Acoustic Intensity

Y2 - 23 September 1985 through 26 September 1985

ER -

Some measurements of sound intensity in air flow

Abstract

Conference

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Cite this