Comparative Investigation of Engine Compartment Insulation Materials on ECE R51 Pass-By Noise Performance of M3 Category Buses
DOI:
https://doi.org/10.5281/zenodo.21356417Anahtar Kelimeler:
ECE R51- ECE R107- Pass-by Noise- Acoustic Insulation- Polyester Nonwoven Felt- Polyurethane Foam- M3 BusÖz
This study presents a comparative investigation of two insulation materials commonly used in commercial vehicle engine compartments: closed-cell polyurethane foam and polyester nonwoven felt. A comprehensive review of commercially available insulation materials was initially conducted considering both acoustic performance and regulatory requirements. Based on this evaluation, two representative insulation solutions were selected for full-scale experimental validation. Two equivalent M3 category city buses equipped with identical 220 kW rear-mounted Mercedes diesel powertrains were tested under standardized ECE R51 pass-by noise conditions. The first configuration employed closed-cell polyurethane foam, while the second utilized polyester nonwoven felt. Noise measurements were performed according to ECE R51 requirements under homologation-level test conditions. Results demonstrated that the polyester nonwoven insulation achieved a lower average pass-by noise level of 74.9 dB(A) compared to 79.5 dB(A) for the polyurethane foam configuration, corresponding to an overall improvement of approximately 4.6 dB. The improved performance was attributed to the superior sound absorption characteristics of the porous fibrous structure, particularly within the dominant engine noise frequency range of 1500–2000 Hz. The study provides practical guidance for acoustic insulation material selection in commercial vehicle applications and demonstrates the importance of considering both acoustic performance and regulatory compliance during engine compartment insulation design.
Referanslar
Qatu, M. S. (2009). Overview of automotive noise and vibration. International Journal of Vehicle Noise and Vibration, 5(1), 1–35. https://doi.org/10.1504/IJVNV.2009.029187
Braun, M. E., Walsh, S. J., Horner, J. L., & Chuter, R. (2013). Noise source characteristics in the ISO 362 vehicle pass-by noise test: Literature review. Applied Acoustics, 74(11), 1241–1265. https://doi.org/10.1016/j.apacoust.2013.04.005
United Nations Economic Commission for Europe (UNECE). (2024). UN Regulation No. 51: Uniform provisions concerning the approval of motor vehicles having at least four wheels with regard to their sound emissions (Revision 3). UNECE.
International Organization for Standardization. (2015). ISO 362-1:2015—Measurement of noise emitted by accelerating road vehicles—Engineering method—Part 1: M and N categories. ISO.
Pang, J. (2014). Noise and vibration control in automotive bodies. Wiley.
United Nations Economic Commission for Europe (UNECE). (2024). UN Regulation No. 107: Uniform provisions concerning the approval of category M2 and M3 vehicles with regard to their general construction. UNECE.
Arenas, J. P., & Crocker, M. J. (2010). Recent trends in porous sound-absorbing materials. Sound and Vibration, 44(7), 12–18.
Allard, J. F., & Atalla, N. (2009). Propagation of sound in porous media: Modelling sound absorbing materials (2nd ed.). Wiley.
Berardi, U., & Iannace, G. (2015). Acoustic characterization of natural fibers for sound absorption applications. Building and Environment, 94, 840–852. https://doi.org/10.1016/j.buildenv.2015.05.029
Tascan, M., & Vaughn, E. A. (2008). Effects of total surface area and fabric density on the acoustical behavior of needle-punched nonwoven fabrics. Textile Research Journal, 78(4), 289–296. https://doi.org/ 10.1177/0040517507084283
Cao, L., Fu, Q., Si, Y., Ding, B., & Yu, J. (2018). Porous materials for sound absorption. Composites Communications, 10, 25–35. https://doi.org/10.1016/j.coco.2018.05.001
Gibson, L. J., & Ashby, M. F. (1997). Cellular solids: Structure and properties (2nd ed.). Cambridge University Press.
Cox, T. J., & D'Antonio, P. (2016). Acoustic absorbers and diffusers: Theory, design and application (3rd ed.). CRC Press.
Beranek, L. L., & Vér, I. L. (2006). Noise and vibration control engineering: Principles and applications (2nd ed.). Wiley.
İndir
Yayınlanmış
Sayı
Bölüm
Kategoriler
Lisans
Telif Hakkı (c) 2026 Ecem Turhan Er, Samet Onur Emir (Author)
Bu çalışma Creative Commons Attribution-NonCommercial 4.0 International License ile lisanslanmıştır.
Makale gönderen yazarlar, Aintelia Science Notes Journal'da (ASNJ) yayınlanmak üzere kabul edildikten sonra çalışmalarının telif haklarını saklı tutarlar. Göndererek yazarlar şunları kabul ederler:
- Telif Hakkının Saklı Tutulması: Yayınlanan makalenin telif hakkı yazar(lar)da kalır. BAUDER Press'e, çalışmayı yayınlama, çoğaltma, dağıtma ve arşivleme konusunda münhasır olmayan bir lisans verilir.
- Lisanslama: Makale, CC BY-NC 4.0 lisansı altında yayınlanır ve üçüncü tarafların, yazar(lar)a ve dergiye uygun şekilde atıfta bulunulması koşuluyla, çalışmayı ticari olmayan amaçlarla paylaşmasına ve uyarlamasına izin verir.
- Yazar Hakları: Yazarlar, derginin orijinal yayın yeri olarak belirtilmesi koşuluyla, makalelerini herhangi bir ortamda (depolar, tezler, konferanslar, öğretim materyalleri) kısıtlama olmaksızın depolama, dağıtma ve yeniden kullanma özgürlüğüne sahiptir.