scholarly journals UNCERTAINTY ANALYSIS OF LABORATORY MEASUREMENT OF AIRBORNE SOUND INSULATION

2020 ◽  
Vol 5 (2) ◽  
pp. 97-108
Author(s):  
Bondan Dwisetyo ◽  
Maharani Ratna Palupi ◽  
Fajar Budi Utomo
Keyword(s):  
Transmission Loss ◽  
Standard Uncertainty ◽  
Major Product ◽  
Laboratory Measurement ◽  
Sound Insulation ◽  
Measured Parameter ◽  
Expanded Uncertainty ◽  
Uncertainty In Measurement ◽  
Airborne Sound ◽  
Uncertainty Measurement

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.

scholarly journals IMPLEMENTATION OF LABORATORY MEASUREMENT OF AIRBORNE SOUND INSULATION BASED ON ISO AND ASTM STANDARDS IN NATIONAL STANDARDIZATION AGENCY OF INDONESIA (BSN)

2021 ◽  
Vol 23 (1) ◽  
pp. 77
Author(s):  
Bondan Dwisetyo ◽  
Maharani Ratna Palupi ◽  
Fajar Budi Utomo ◽  
Chery Chaen Putri ◽  
Dodi Rusjadi ◽  
...  
Keyword(s):  
Transmission Loss ◽  
Laboratory Measurement ◽  
Sound Insulation ◽  
Reference Curve ◽  
Airborne Sound ◽  
Significant Difference ◽  
Single Number ◽  
Sound Reduction ◽  
Reduction Index

<p>The implementation of laboratory measurement of airborne sound insulation based on ISO and ASTM standards was carried out at SNSU BSN. The aim of this work to realize the measurement of airborne sound insulation for several sample tests, where the procedure of the test is performed according to the updated standard ISO 10140 and ASTM E90. Besides, the single number rating also is determined based on ISO 717-1 and ASTM E413. This measurement has been conducted in the two reverberation rooms using pressure method consist of measuring the sound pressure level, measuring the reverberation time, obtaining the sound reduction index (R) or sound transmission loss (STL), and determination of a single-number ratings of the samples test. From the results, some parameter requirements such as the frequency range and the rounding procedure of R or STL influence the measurement result slightly. Subsequently, the significant difference is obtained for the determination of single number rating in the shifting procedure of the reference curve.</p>

Assessment of the Uncertainty in the Measurement of Depth of Decarburization of Steel Rail

2012 ◽  
Vol 524-527 ◽  
pp. 1989-1992
Author(s):  
Yi Qiang Sun ◽  
Li Xin Wu ◽  
Zhi Fen Wang ◽  
Ping Zhang
Keyword(s):  
Cross Section ◽  
Standard Uncertainty ◽  
Expanded Uncertainty ◽  
Steel Rail ◽  
Uncertainty In Measurement ◽  
The Cross ◽  
Expression Of Uncertainty

In order to analysis the factors effect the uncertainty in the measurement of depth of decarburization and characterized the dispersity of the measuring results, according to the theory of the uncertainty in measurement and JJF1059-1999 Evaluation and Expression of Uncertainty in Measurement, the uncertainty in the measurement of depth of decarburization of steel rail was assessed, which was caused by the uneven of decarburization and the repetitiveness of the measure, the obliquity of the cross section, the accurate degree of the measure instrument, the approximate of the value. The combined standard uncertainty and the expanded uncertainty was calculated, and the report of the uncertainty was given.

Evaluation of Uncertainty Measurement with Intelligent Contact Type Interferometer

2013 ◽  
Vol 333-335 ◽  
pp. 348-352
Author(s):  
Jin Hai Li ◽  
Xing Long Wang ◽  
Suo Sheng Cao ◽  
Zhan Biao Song
Keyword(s):  
Mathematical Modeling ◽  
Measurement Uncertainty ◽  
Computer Technology ◽  
Measurement Method ◽  
Standard Uncertainty ◽  
Expanded Uncertainty ◽  
Comparative Measurement ◽  
Gauge Block ◽  
Contact Type ◽  
Uncertainty Measurement

An evaluation is conducted to the uncertainty measurement with contact type interferometer after intellectualized improvement. CMOS sensing photographing technology and computer technology are applied to the improvement of contact type interferometer. A mathematical modeling is established by taking pixel number as reading unit and gauge block length comparative measurement method as means. The purpose is to analyze the source of measurement uncertainty, estimate the standard uncertainty of input, evaluate and set forth the expanded uncertainty. The result of evaluation is superior to the level of measurement uncertainty before improvement.

A Comparative Study of Sound Transmission Loss Provided by Glass, Acrylic and Polycarbonate

2013 ◽  
Vol 60 (1) ◽  
Author(s):  
Elwaleed Awad Khidir ◽  
Zambri Harun ◽  
Mohd Jailani Mohd Nor ◽  
Muhamad Razi
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Material Density ◽  
Airborne Sound ◽  
Single Number ◽  
Reverberation Chambers ◽  
Sound Reduction ◽  
Reduction Index

This article presents an assessment for the airborne sound insulation provided by single glazed panels. The glazed panels were glass, acrylic and polycarbonate with a thickness of 4 mm. The experiments were conducted in a transmission loss facility consisting of semi anechoic and reverberation chambers. The panels were subjected to airborne sound and the data collected. Glass, acrylic and polycarbonate panel absorb noise most effectively above 500 Hz with the absorption peaks at 1000 Hz. The single number sound reduction index (RW) for glass, polycarbonate and acrylic were 41 dB, 38 dB and 37 dB, respectively. This could be attributed mainly to the material density which is higher for the glass. Keywords: Sound transmission loss; glazing; insulation; weighted index

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