Investigation of Acoustic Properties of Fibrous Materials Used in Automotive

Abstract

Acoustic comfort factors play an important role in automobile preferences of today’s customer. The main automotive manufacturers also have a basic desire. They prefer products with strong insulation ability but low cost. For this reason, insulator designers and manufacturers must be in continuous development. As a result of the widespread use of electric vehicles, expectations for acoustic comfort have been increased. Purpose of this study, to obtain sound transmission loss and sound absorption coefficient of insulation materials used in vehicles. These insulating materials will be selected in different contents, weights and thicknesses. Relation between weight, sound transmission loss, sound absorption coefficient will be investigated. In this way, this study will be a main information source for acoustic studies in the automotive sector.

Keywords

• Sound absorption coefficient
• Sound transmission loss
• Impedance tube
• Fiber materials

OTOMOTİVDE KULLANILAN ELYAFLI MALZEMELERİN AKUSTİK ÖZELLİKLERİNİN İNCELENMESİ

Abstract

Akustik konfor faktörleri günümüz müşterilerinin otomobil tercihlerinde önemli bir rol oynamaktadır. Ana otomotiv üreticileri yüksek yalıtım kabiliyeti olan ancak düşük maliyetli ürünleri tercih etmektedirler. Bu nedenle, izolatör tasarımcıları ve üreticileri sürekli olarak kendilerini geliştirmelidir. Elektrikli araçların yaygın kullanımı sonucunda, akustik konfor beklentileri artmıştır. Bu çalışmanın amacı, taşıtlarda kullanılan yalıtım malzemelerinin ses iletim kaybı ve ses emme katsayısını elde ederek yorumlamaktır. Yalıtım malzemeleri farklı içerik, ağırlık ve kalınlıklarda seçilmiştir. Ağırlık, ses iletim kaybı, ses emme katsayısı arasındaki ilişki incelenmiştir. 

Keywords

• Ses emme katsayısı
• Ses iletim kaybı
• Empedans tüpü
• Elyaf malzemeler

References

1. 1. Aydın, İ., Batmaz, İ. (2012) Determination of The Sound Absorption Coefficients of Insulation Materials Used on Vehicles, Journal of the Faculty of Engineering and Architecture of Gazi University, 27(4), 687–693.
2. 2. Lee P.H., Ng, B.M.P., Rammohan, A.V., Tran, L.Q.N. (2017) An Investigation of the Sound Absorption Properties of Flax/Epoxy Composites Compared with Glass/Epoxy Composites, J of Natural Fibers, 12(1), 71–77.doi: 10.1080/15440478.2016.1146643
3. 3. Veerakumar, A., Selvakumar, N.A. (2012) A Preliminary Investigation on Kapok/Polypropylene Nonwoven Composite for Sound Absorption, Indian Journal fibre Textile Research, 37(4), 385-388.
4. 4. Shu, Y., Weidong, Y., Pan N. (2011) Investigation of The Sound-Absorbing Behavior of Fiber Assemblies, Text Research J, 81(7), 673–682. doi: 10.1177/0040517510385177
5. 5. Wang, C.N., Torng, J.H. (2001) Experimental Study of The Absorption Characteristics of Some Porous Fibrous Materials, Appl Acoustics, 62(4), 447–459. doi:10.1016/S0003-682X(00)00043-8
6. 6. Na, Y., Lancaster, J., Casali, J. (2007) Sound Absorption Coefficients of Micro-Fiber Fabrics by Reverberation Room Method, Text Res J, 77(5), 330–335. doi: 10.1177/0040517507078743
7. 7. Selver, E. (2019) Acoustic Properties of Hybrid Glass/Flax and Glass/Jute Composites Consisting of Different Stacking Sequences, Tekstil ve Mühendis, 26(113), 42–51.doi: 10.7216/1300759920192611305
8. 8. Yang, W., Li, Y. (2012) Sound Absorption Performance Of Natural Fibers And Their Composites, China Tech Sci, 55(8), 2278–2283.doi: 10.1007/s11431-012-4943-1

9. 9. Lim, Z.Y., Putra, A., Nor, M.J.M., Yaakob, M.Y. (2018) Sound Absorption Performance Of Natural Kenaf Fibres, Appl Acoustics, 130, 107–114.doi: 10.1016/j.apacoust.2017.09.012
10. 10. Meriç, C., Erol, H., Aytekin, Ö. (2016) On The Sound Absorption Performance Of A Felt Sound Absorber, Appl Acoustics, 114, 275–280.doi: 10.1016/j.apacoust.2016.08.003
11. 11. Kundt, A. (1866) Acoustic Experiment, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 35(4), 41–48.
12. 12. ISO Norm 10534-2, (1998). Acoustics, Determination of Sound Absorption Coefficient and Impedance in Impedance Tubes: Part 2: Transfer-function Method, International Organization for Standardization, Switzerland.
13. 13. Crocker, M. Sommerfeldt, S. (2008) Handbook of Noise and Vibration Control,The Journal of the Acoustical Society of America. 1898 pp.
14. 14. Brüel&Kjær (2019). Product Data: Impedance Tube Kit (50 Hz – 6.4 kHz) Type 4206, Impedance Tube Kit (100 Hz – 3.2 kHz) Type 4206-A, Transmission Loss Tube Kit (50 Hz – 6.4 kHz) Type 4206-T. Erişim Adresi: https://www.bksv.com/media/doc/Bp1039.pdf (Erişim Tarihi: 08.11.2019)
15. 15. Kinsler, L.E., Frey, A.R., Coppens, A.B., Sanders, J.V. (1982) Fundamentals of Acoustics,The Journal of the Acoustical Society of America, USA.
16. 16. ASTM E2611, (2019). Standard Test Method for Normal Incidence Determination of Porous Material Acoustical Properties Based on the Transfer Matrix Method, ASTM International, West Conshohocken, PA.
17. 17. Aydın, İ. (2008).Otomobillerde Kullanılanİzolasyon Malzemelerinin Emme Katsayılarının Ölçülmesi VeUygun Malzeme Kalınlığının Belirlenmesi, Yüksek Lisans Tezi, G.Ü. Fen Bilimleri Enstitüsü, Ankara.
18. 18. Ahmed, N.F. (2016) Effect of Fibers Types on the Properties of Acoustic and Thermal Nonwoven Fabrics Used in Cars, J. Basic. Appl. Sci. Res.6(10), 9-18.
19. 19. Taban, E., Khavanin, A., Jafari, A.J., Faridan, M., Tabrizi, A.K. (2019) Experimental and mathematical survey of sound absorption performance of date palm fibers, Heliyon. 5(6), 1-8.https://doi.org/10.1016/j.heliyon.2019.e01977
20. 20. Yılmaz, N.D. (2009) Acoustic Properties of Biodegradable Nonwovens, PhD Thesis, NC State University, USA.