Abstract
The evaluation and analysis of the uncertainty of laboratory measurement of airborne sound insulation have been carried out by Research Group for Acoustics and Vibration – National Standardization Agency of Indonesia (BSN). The aims of this work are to evaluate and analyze the uncertainty measurement of airborne sound insulation by pressure method, where it is focused only for the determination of sound transmission loss (STL) as a major product of this measurement according to ASTM, and guide to the expressions of Uncertainty in Measurement (GUM) provided by JCGM. The supplied parameter of uncertainty budgets includes measurement of sound pressure level (SPL) in a source room (L1), and measurement of some parameters in a receiver room such as SPL (L2), reverberation time (RT60), background noise (B), test opening area (S), and volume of receiver room (V). From the result of the case study, the source of uncertainty that has a top contribution for obtaining expanded uncertainty is considered as the repeated measurement of the measured parameter such as L1, L2, and RT60 at the frequency range 250 Hz – 315 Hz. Meanwhile, the standard uncertainty that provided by the calibration certificate also contributes to the final result, where it is supplied by an acoustic calibrator and sound analyzer, respectively. Furthermore, the sources obtained from the readability parameter has a slight effect on this whole result. Therefore, the maximum and minimum value of expanded uncertainty is determined that their values are 0.70 dB and 0.43 dB for the frequency of 315 Hz and 1600 Hz, respectively.
Highlights
The international standard guidance of sound insulation measurement for the buildings and building materials has been published by international standard bodies such as International Organization for Standardization (ISO) and the American Society for Testing and Materials (ASTM)
The first is the measurement that is applied in the laboratory for the sound that propagates through an air medium, while the second is the insulation measurement where the sound is generated by direct contact of an object on the building element [1]
The aims of this work are to evaluate and analyze the uncertainty measurement of airborne sound insulation by pressure method that has been performed by BSN as mentioned above, where it will be focused only for the determination of sound transmission loss (STL) as a major product of this measurement in the laboratory scope according to ASTM E413
Summary
The international standard guidance of sound insulation measurement for the buildings and building materials has been published by international standard bodies such as International Organization for Standardization (ISO) and the American Society for Testing and Materials (ASTM). Airborne sound insulation is the most common measurement that has been implemented by some institutions that have the capability to provide research and service of the building acoustics field include the National Standardization Agency of Indonesia (BSN). This measurement can be performed inside the two reverberation rooms as the main requirements and utilize the diffuse field of microphones [3]. Identification of this product of measurement is necessary to be conducted to observe the influence of the associated parameters that consist of system measurement, facilities, method, and environmental conditions to the result of the measurement
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