Low-Cost and Portable Sound Reduction Box: Innovation for Acoustic Material Performance Measurement
Keywords:portable sound reduction box, sound insulation test, sound reduction index, anechoic chamber, sound intensity
AbstractA sound reduction index (RIc) is a laboratory measurement of the sound insulating properties of a material or building element, commonly conducted using a reverberation chamber and an anechoic chamber (SIC), which requires high expenses. This study aimed to perform RIc analysis using a sound reduction box (SRB) to assess the accuracy and precision of the associated result compared to an SIC. The SRB is a miniature reverberation chamber innovation that is owned by the Center for Research and Development of Quality and Environmental Laboratory (P3KLL). The anechoic chamber is substituted by open space as free-field environment. The methods used in this study are based on ISO 15186-1 and ISO 717-1. Measurement was executed using a sound intensity analyzer and data interpretation was done by employing statistical analysis. The types of insulating materials tested were wood boards made of Shorea sp., Swietenia sp. and Dryobalanops sp. with a thickness of 2 cm and 4 cm. Test material measurement was done using the same measuring instruments, sound generators, sound amplifiers, and personnel. The results show that the RIc values were almost the same for both methods (SIC and SRB). When the weighted sound reduction index (Rw) rating calculated from the RIc was compared between the SIC and the SRB, the results were not statistically different. It is interesting that an SRB can be developed in the future as an alternative device for acoustic materials testing.
Barron, R.F., Industrial Noise Control and Acoustics, New York: Marcel Decker, Inc., 2003.
Ver, I.L. & Beranek, L.L., Noise and Vibration Control Engineering, 2nd ed., New Jersey: Jhon Wiley & Sons, Inc., 2006.
Tsui, C.Y., Voorhees, C.R. & Yang, J.C.S., The Design of Small Reverberation Chambers for Transmission Loss Measurement, Applied Acoustics, 9(1976), 1976.
Robin, O. & Barry, A., Estimating the Sound Transmission Loss of a Single Partition Using Vibration Measurements, Applied Acoustics, 141(2018), pp. 301-306, 2018.
ISO 10140-1:2010 Acoustics - Laboratory Measurement of Sound Insulation of Building Elements, Part 1. Application Rules for Specific Products.
ISO 15186-1:2000 Acoustics - Measurement of Sound Insulation in Buildings and of Building Elements Using Sound Intensity, Part 1: Laboratory Measurements.
ISO 15186-3:2002 Acoustics - Measurement of Sound Insulation in Buildings and of Building Elements Using Sound Intensity, Part 3: Laboratory Measurements at Low Frequencies.
Garg, N., Measurement Uncertainty in Airborne Sound Insulation and Single-Number Quantities Using Sound Pressure and Sound Intensity Approaches, Noise Control Engineering Journal, 64(2), pp. 153-169, 2016.
Waser, M.P. & Crocker, M.J., Introduction to the Two-Microphone Cross-Spectral Method of Determining Sound Intensity, Noise Control Engineering Journal, 22(3), pp. 76-85, 1984.
Wareing, R.R., Davy, J.L. & Pearse, J.R., Variation in Measured Sound Transmission Loss due to Sample Size and Construction Parameters, Applied Acoustic, 89(2015), pp. 166-177, 2015.
Xu, Q. & Huang, Y., Anechoic and Reverberation Chambers: Theory, Design, and Measurements, New Jersey, John Wiley & Sons Ltd., 2019.
Peterson, J.S., Yantek, D. & Smith, A.K., Acoustic Testing Facilities at the Office of Mine Safety and Health Research, Noise Control Engineering Journal, 60(1), pp. 85-96, 2012.
Scamoni, F., Piana, E.A. & Scrosati, C., Experimental Evaluation of the Sound Absorption and Insulation of an Innovative Coating Through Different Testing Methods, Building Acoustics, 24(3), pp. 173-191, 2017. DOI: 10.1177/1351010X17728596. journals.sagepub.com/home/bua
Kim, H.M., Using a Small-Scale Reverberation Chamber to Improve a Ship's Double Sandwich Panel Noise Attenuation Performance, Noise Control Engineering Journal, 58(6), pp. 636-645, 2010.
Rajaram, S., Wang, T. & Nutt, S., Small-Scale Transmission Loss Facility for ,at Lightweight Panels, Noise Control Engineering Journal, 57(5), pp. 536-542, 2009.
Jagniatinskis, A., Fiks, B. & Girnius, V., Airborne Sound Insulation Performance of Lightweight Partitions for Dwellings, 9th International Conference "Modern Building Materials, Structures and Techniques': selected papers, Vilnius, Lithuania, 3, pp. 1186-1190, May 16-18, 2007. ISBN 9789955282006.
Fahy, F. & Gardonio, P., Sound and Structural Vibration: Radiation, Transmission and Response, 2nd ed., pp. 135-241. Burlington: Elsevier, United States, 2007.
Piana, E.A. & Nilsson, A.C., Prediction of the Sound Transmission Loss of Sandwich Structures Based on a Simple Test Procedure, In: Proceedings of the 17th international congress on sound and vibration, ICSV, 2010.
May, D.N., The Optimum Weight of Highway Noise Barriers, Journal of Sound and Vibration, 68(1), pp. 1-13, 1980.
Br1/4el & Kjr, BZ-5503 Measurement Partner Suite, Nrum: Br1/4el & Kjr Sound & Vibration Measurement A/S, 2014.
Br1/4el & Kjr, Sound Intensity Software BZ7205, Nrum: Br1/4el & Kjr Sound & Vibration Measurement A/S, 1998.
ISO 717-1:2013 Standards Publication Acoustics-Rating of Sound Insulation in Buildings and of Building Elements, Part 1"i: Airborne Sound Insulation, 2013.
Granzotto, N. & Di Bella, A., Analysis between Weighted Sound Reduction Index According To ISO 717-1 and Indices According to ISO 16717-1. Conference on Acoustics AIA-DAGA, 2013.
Berardi, U., A Comparison of Measurement Standard Methods for the Sound Insulation of Building Faades, Building Acoustic, 19(4), pp. 267-282, 2012.
Viscardi, M. & Arena, M., Sound Proofing and Thermal Properties of an Innovative Viscoelastic Treatment for the Turboprop Aircraft Fuselage, CEAS Aeronautical Journal, 10(2), pp.443-452 2018. DOI: 10.1007/ s13272-018-0326-z.
Taibo, L. & de Dayan, H.G., Comparison of Laboratory and Field Sound Insulation Measurements of Party Walls and Faade Elements, Journal of the Acoustical Society of America, 75(5), pp. 1522-1531, 1984.