This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Measurement and Prediction of Sound Absorption of Sound Package Materials in Large and Small Reverberation Chambers
Technical Paper
2017-26-0195
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The paper discusses the methodology for measuring the sound absorption of sound package materials in a different sizes of reverberation chambers. The large reverberation chamber is based on test methods and requirements as per ASTM C423 and ISO 354 standards. Both the test standards are similar and recommend a reverberation chamber volume of at least 125 m3 and 200 m3 respectively for sound absorption measurements from 100 Hz to 5000 Hz. The test sample size requirements are from 5.5 to 6.7 m2 as per ASTM C423 and 10 to 12 m2 as per ISO 354. In the automotive sector passenger car, heavy truck, and commercial vehicle, the parts that are used are much smaller in size than the size prescribed in both the standards. The requirement is to study the critical parameters such as the chamber volume, sample size, reverberation time and cut-off frequency etc. which are affecting the sound absorption property of acoustic material. The melamine foam has been chosen for carrying out the study which is more uniform and homogeneous foam. The sound absorption of melamine foam evaluated in large and small reverberation chamber with different sample sizes. Also the intrinsic parameter of melamine foam evaluated to predict the random incidence sound absorption and study the effect of samples size based on Finite Transfer Matrix Method (FTMM). The predicted results using FTMM technique established good correlation with experimental results. The paper discuss the measurements carried out at different labs with various test conditions such as chamber sizes, sample sizes, cut-off frequency etc. Finally the suggestion has been given to arrive good agreement in sound absorption results when measured in different size of reverberation chambers.
Authors
- Sachin Kumar Jain - Automotive Research Association of India
- Manasi Joshi - Automotive Research Association of India
- Harshal Bankar - Automotive Research Association of India
- Prashant Kamble - Automotive Research Association of India
- Prasad Yadav - Automotive Research Association of India
- Nagesh Karanth - Automotive Research Association of India
Citation
Jain, S., Joshi, M., Bankar, H., Kamble, P. et al., "Measurement and Prediction of Sound Absorption of Sound Package Materials in Large and Small Reverberation Chambers," SAE Technical Paper 2017-26-0195, 2017, https://doi.org/10.4271/2017-26-0195.Also In
References
- Acoustics - Measurement of sound absorption in a reverberation chamber ISO Standard 354 May 2003
- Standard test method for sound absorption and sound absorption coefficients by reverberation chamber method ASTM standard C423 2009
- Saha , P. , Pan , J. , and Veen , J. Thoughts behind Developing SAE Standard J2883 - Random Incidence Sound Absorption Tests Using a Small Reverberation Room SAE Technical Paper 2009-01-2141 2009 10.4271/2009-01-2141
- Allard J.F. Propagation of sound in porous media: modelling sound absorbing materials Elsevier Ireland 2010
- Song B.H. and Bolton S.J. Effect of circumferential edge constraint on the acoustical properties of glass fiber materials Journal of Acoustical Society of America 110 pp. 2902 2916 2001
- Standard test method for AirFlow Resistance of Acoustic Materials ASTM standard C522 2016
- Standard test method for Impedance and Absorption of Materials Using a Tube, Two Microphones and Digital Frequency Analysis System ASTM standard E1050 2012
- Duval Arnaud , Rondwau Jean- Francois , Dejaeger Ludovic , Sgard Franck and Atalla. Noureddine Diffuse field absorption coefficient simulation of porous materials in small reverberant chambers: finite size and diffusivity issues
- Thomasson S I On the absorption coefficient Acoustica 44 265 273 1980