Measurement of sound intensity using a single moving microphone

Musha, Takaaki; Taniguchi, Jun

doi:10.1016/j.apacoust.2004.09.003

“…Therefore, the sound intensity measurement preciseness is restricted to the gap between the two transducers. In addition, the two transducers should be phase-matched (Musha & Taniguchi, 2005).…”

Section: Two Spaced One Dimensional Transducers Sensors 232mentioning

confidence: 99%

Exploring Acoustical Approach for Pre-screening of Window Assemblies Airtightness Level in an Existing Building

Pouyan¹

2021

Preprint

0

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Air infiltration plays a significant role in designing and evaluating the performance and air quality of a building. Air leakage through an existing building enclosure can be detected by using experimental measurements, such as blower door test, tracer gas method, and transient approach. Estimating building air permeability through these methods can be expensive, time consuming, and weather reliant. The economical and environmental effect of air infiltration through building envelope requires higher level of research on locating air leakage locations and estimating air infiltration rate through new techniques, such as acoustical methods. In this research, a general review of airtightness detection and quantification method is presented and acoustical techniques are explored more in depth. Due to the significant impact of window systems on the total air infiltration through the building envelope, the correlation between the sound transmission loss and the air permeability through seven window assemblies in an existing building are explored to investigate acoustical method further. In addition, the acoustic air leakage detection method based on the standard ASTM E1186 is instigated. The results reveal the poor correlation between the airtightness of the windows and the acoustical analysis and investigations

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“…Typically, the sound intensity measurement device by one-dimensional transducers consists of two spaced pressure microphone which is connected with a solid spacer (Musha & Taniguchi, 2005). In this method, pressure gradient is determined in order to calculate the sound intensity (Musha & Taniguchi, 2005). The disadvantage of this approach is that if the distance between the two microphones is more than the wavelength, the pressure estimation will fail.…”

Section: Two Spaced One Dimensional Transducers Sensors 232mentioning

confidence: 99%

Exploring Acoustical Approach for Pre-screening of Window Assemblies Airtightness Level in an Existing Building

Pouyan¹

2021

Preprint

0

View full text Add to dashboard Cite

Air infiltration plays a significant role in designing and evaluating the performance and air quality of a building. Air leakage through an existing building enclosure can be detected by using experimental measurements, such as blower door test, tracer gas method, and transient approach. Estimating building air permeability through these methods can be expensive, time consuming, and weather reliant. The economical and environmental effect of air infiltration through building envelope requires higher level of research on locating air leakage locations and estimating air infiltration rate through new techniques, such as acoustical methods. In this research, a general review of airtightness detection and quantification method is presented and acoustical techniques are explored more in depth. Due to the significant impact of window systems on the total air infiltration through the building envelope, the correlation between the sound transmission loss and the air permeability through seven window assemblies in an existing building are explored to investigate acoustical method further. In addition, the acoustic air leakage detection method based on the standard ASTM E1186 is instigated. The results reveal the poor correlation between the airtightness of the windows and the acoustical analysis and investigations

show abstract

“…Sound intensity was measured by applying 3200 Hz as f max to identify the noise level at 3000 Hz, the blade passage frequency. In general, the size of microphone and spacer that is the gap of the sound intensity probe was determined according to the frequency band [22,23]. In this experiment, a 50 mm spacer (UC5270) and 1/2 in.…”

Section: Sound Intensity Measurementmentioning

confidence: 99%