Acoustic modelling and testing of diesel particulate filters
2005 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 288, no 02-jan, 255-273 p.Article in journal (Refereed) Published
The use of Diesel Particulate Filters (DPFs) on automobiles to reduce the harmful effects of diesel exhaust gases is becoming a standard in many countries. Although the main purpose of a DPF is to reduce harmful emission of soot particles it also affects the acoustic emission. This paper presents a first attempt to describe the acoustic behavior of DPFs and to present models which allow the acoustic two-port to be calculated. The simplest model neglects wave propagation and treats the filter as an equivalent acoustic resistance modeled via a lumped impedance element. This simple model gives a constant frequency-independent transmission loss and agrees within I dB with measured data on a typical filter (length 250 mm) up to 200-300 Hz (at 20 degrees C). In the second model, the ceramic filter monolith is described as a system of coupled porous channels carrying plane waves. The coupling between the channels through the porous walls is described via Darcy's law. This model gives a frequency-dependent transmission loss and agrees well with measured data in the entire plane wave range.
Place, publisher, year, edition, pages
2005. Vol. 288, no 02-jan, 255-273 p.
IdentifiersURN: urn:nbn:se:kth:diva-15069DOI: 10.1016/j.jsv.2005.01.004ISI: 000232227400013ScopusID: 2-s2.0-24344447751OAI: oai:DiVA.org:kth-15069DiVA: diva2:333110
QC 201005252010-08-052010-08-052012-03-29Bibliographically approved