Change search
ReferencesLink to record
Permanent link

Direct link
Acoustic modeling and testing of exhaust and intake system components
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.
2011 (English)Licentiate thesis, monograph (Other academic)
Abstract [en]

Intake and exhaust orifice noise contributes to interior and exterior vehicle noise. The order noise radiated from the orifice of the intake and exhaust systems is caused by the pressure pulses generated by the periodic charging and discharging process and propagates to the open ends of the duct systems.

The propagation properties of these pulses are influenced by the dimensions and acoustic absorption properties of the different devices in the intake/exhaust line (muffler, turbocharger, catalyst, intercooler, particulate filter, etc.). Additional to this pulse noise, the pulsating flow in the duct system generates flow noise by vortex shedding and turbulence at geometrical discontinuities.

Several turbochargers, catalytic converters, Diesel particulate filters and intercoolers elements were investigated and analyzed by performing two-port acoustic measurements with and without mean flow at both cold conditions (room temperature) and hot conditions (running engine test bed) to investigate these devices as noise reduction elements. These measurements were performed in a frequency range of 0 to 1200 Hz at no flow conditions and at flow speeds: 0.05 and 0.1 Mach.

A new concept for the acoustic modeling of the catalytic converters, Diesel particulate filters and Intercoolers, and a new geometrical model for the turbocharger were developed. The whole test configuration was modeled and simulated by means of 1-D gas dynamics using the software AVL-Boost. The results were validated against measurements. The validation results comprised the acoustic transmission loss, the acoustic transfer function and the pressure drop over the studied test objects. The results illustrate the improvement of simulation quality using the new models compared to the previous AVL-Boost models.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , 94 p.
Trita-AVE, ISSN 1651-7660 ; 2011:51
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-48070OAI: diva2:456766
2011-08-25, KTH, Stockholm, 10:00
TrenOp, Transport Research Environment with Novel Perspectives
QC 20111115Available from: 2011-11-15 Created: 2011-11-15 Last updated: 2012-06-12Bibliographically approved

Open Access in DiVA

fulltext(3192 kB)5277 downloads
File information
File name FULLTEXT01.pdfFile size 3192 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
MWL Flow acoustics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 5278 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 282 hits
ReferencesLink to record
Permanent link

Direct link