This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Improvement of Sound Absorption Material for Diesel Engine Cover
Technical Paper
2009-36-0292
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In this work the acoustic treatment of an engine cover was designed based on airflow resistance and sound absorption data. Single layer and multilayer treatments with measured airflow resistance were employed to reduce noise radiated by a diesel engine. The analysis was focused in the region in which the “knocking” noise is particularly noticeable. The methodology of acoustic design was confirmed by in-vehicle noise measurements. The application of a sound absorption treatment with a controlled specific airflow resistance provided the highest noise attenuation. An improvement in the sound quality was also achieved due to a reduction in the “knocking” noise.
Recommended Content
Authors
Citation
Calçada, M. and Rocha, T., "Improvement of Sound Absorption Material for Diesel Engine Cover," SAE Technical Paper 2009-36-0292, 2009, https://doi.org/10.4271/2009-36-0292.Also In
References
- Zent, A. Long, J. T. Automotive Sound Absorbing Material Survey Results SAE technical paper 2007-01-2186
- ISO 9053 Acoustics – Materials for acoustical applications – Determination of airflow resistance 1991
- ASTM C522 Standard Test Method for Airflow Resistance of Acoustical Materials 1980
- ISO 10534-2 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes, Part 2: Transfer-function method 1998
- ASTM E1050-98 Standard test method for impedance and absorption of acoustical materials using a tube, two microphones, and a digital frequency analysis system 1998
- Allard, J. F. Propagation of Sound in Porous Media - Modeling sound absorbing materials Elsevier Applied Science N. Y. 1993
- Brouard, B. Lafarge, D. Allard, J.F. A general method of modeling sound propagation in layered media Journal of Sound and Vibration V. 183 1 129 142 1995
- Bolton, J. S. Shiau, N. M. Kang, Y. J. Sound transmission through multipanel structures lined with elastic porous materials Journal of Sound and Vibration V. 191 317 347 1996
- Bolton, J. S. Kang, Y.J. Porous materials for sound absorption and transmission control SAE technical paper 971878 1997