Next Article in Journal
Combined Flexural and Shear Strengthening of RC T-Beams with FRP and TRM: Experimental Study and Parametric Finite Element Analyses
Next Article in Special Issue
Validation of the Low-Frequency Procedure for Field Measurement of Façade Sound Insulation
Previous Article in Journal
Residual Strength of Reinforced Concrete Beams under Sequential Small Impact Loads
Previous Article in Special Issue
The Influence of Different Scattering Algorithms on Room Acoustic Simulations in Rectangular Rooms
 
 
Article

Diffuseness Quantification in a Reverberation Chamber and Its Variation with Fine-Resolution Measurements

Department of Building, Civil and Environmental Engineering, Concordia University, Montréal, QC H3G 1M8, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Cheol-Ho Jeong
Buildings 2021, 11(11), 519; https://doi.org/10.3390/buildings11110519
Received: 27 August 2021 / Revised: 28 October 2021 / Accepted: 29 October 2021 / Published: 4 November 2021
Insufficient diffuseness is the major cause of the poor repeatability and reproducibility of building acoustical measurements in a reverberation chamber. Inaccurate results were reported for the prevailing methods in ISO and ASTM standards. Many previous studies, thus, have proposed new methods to quantify the diffuseness of a reverberation chamber more accurately, but there is no general agreement among researchers on the most reliable method. The number of measurement samples required for these diffuseness metrics is also unclear, even though it significantly impacts the robustness of the methods. This study, therefore, aims to compare the performance of the two widely used diffuseness metrics (spatial variation of sound pressure levels and the relative standard deviation of decay rates) in the standards and the recently introduced metric (degree of time series fluctuation). The measurements were carried out with fine resolution microphone positions and varied configurations of acoustic diffusers. The degree of time series fluctuation showed the best correlation with varying diffuser configurations in the low-frequency range. Confidence intervals and coefficients of variation of the three metrics by random sampling also indicated that DTF is more reliable for evaluating the diffuseness in a sound field as it is less influenced by the number of sampling. View Full-Text
Keywords: reverberation chamber; diffuseness quantification; measurement sampling reverberation chamber; diffuseness quantification; measurement sampling
Show Figures

Figure 1

MDPI and ACS Style

Zhang, S.; Lee, J. Diffuseness Quantification in a Reverberation Chamber and Its Variation with Fine-Resolution Measurements. Buildings 2021, 11, 519. https://doi.org/10.3390/buildings11110519

AMA Style

Zhang S, Lee J. Diffuseness Quantification in a Reverberation Chamber and Its Variation with Fine-Resolution Measurements. Buildings. 2021; 11(11):519. https://doi.org/10.3390/buildings11110519

Chicago/Turabian Style

Zhang, Shuying, and Joonhee Lee. 2021. "Diffuseness Quantification in a Reverberation Chamber and Its Variation with Fine-Resolution Measurements" Buildings 11, no. 11: 519. https://doi.org/10.3390/buildings11110519

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop