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Investigation of the Acoustic Performance of After Treatment Devices
Ain Shams University, Egypt.
2011 (English)In: SAE International Journal of Passenger Cars - Mechanical Systems, ISSN 1946-3995, Vol. 4, no 2, 1068-1075 p.Article in journal (Refereed) Published
Abstract [en]

Diesel engines produce harmful exhaust emissions and high exhaust noise levels. One way of mitigating both exhaust emissions and noise is via the use of after treatment devices such as Catalytic Converters (CC), Selective Catalytic Reducers (SCR), Diesel Oxidation Catalysts (DOC), and Diesel Particulate Filters (DPF). The objective of this investigation is to characterize and simulate the acoustic performance of different types of filters so that maximum benefit can be achieved. A number of after treatment device configurations for trucks were selected and measured. A measurement campaign was conducted to characterize the two-port transfer matrix of these devices. The simulation was performed using the two-port theory where the two-port models are limited to the plane wave range in the filter cavity. These models are implemented in SIDLAB Software for the simulation of low frequency sound propagation in ducts, and SIDLAB was used to predict the transfer matrix of the tested configurations. This paper presents guidelines for dividing these complicated systems into a number of simple 1D elements. Specifically, strategies for modeling the side inlet and outlet end caps are documented. The model takes about 15 minutes to set-up and 15 seconds to solve which demonstrates the power of using two-port techniques in modeling exhaust systems. The comparisons show good agreement between the measured and simulated transmission loss in the plane wave region.

Place, publisher, year, edition, pages
2011. Vol. 4, no 2, 1068-1075 p.
Keyword [en]
Acoustic performance, After treatment devices, Complicated systems, Diesel oxidation catalyst, Diesel particulate filters, Exhaust emission, Exhaust noise, Low-frequency sounds, Measurement campaign, Plane wave, Transfer matrixes, Transmission loss, Two-port models
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-103696DOI: 10.4271/2011-01-1562Scopus ID: 2-s2.0-84859310639OAI: oai:DiVA.org:kth-103696DiVA: diva2:561262
Note

QC 20121018

Available from: 2012-10-18 Created: 2012-10-18 Last updated: 2014-04-14Bibliographically approved
In thesis
1. Investigation and Optimization of the Acoustic Performance of Exhaust Systems
Open this publication in new window or tab >>Investigation and Optimization of the Acoustic Performance of Exhaust Systems
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

There is a strong competition among automotive manufacturers to reduce the radiated noise levels. One important source is the engine exhaust where the main noise control strategy is by using efficient mufflers. Stricter vehicle noise regulations combined with various exhaust gas cleaning devices, removing space for traditional mufflers, are also creating new challenges. Thus, it is crucial to have efficient models and tools to design vehicle exhaust systems. In addition the need to reduce CO2 emissions puts requirements on the losses and pressure drop in exhaust systems. In this thesis a number of problems relevant for the design of modern exhaust systems for vehicles are addressed. First the modelling of perforated mufflers is investigated. Fifteen different configurations were modeled and compared to measurements using 1D models. The limitations of using 1D models due to 3D or non-plane wave effects are investigated. It is found that for all the cases investigated the 1D model is valid at least up to half the plane wave region. But with flow present, i.e., as in the real application the 3D effects are much less important and then normally a 1D model works well. Another interesting area that is investigated is the acoustic performance of after treatment devices. Diesel engines produce harmful exhaust emissions and high exhaust noise levels. One way of mitigating both exhaust emissions and noise is via the use of after treatment devices such as Catalytic Converters (CC), Selective Catalytic Reducers (SCR), Diesel Oxidation Catalysts (DOC), and Diesel Particulate Filters (DPF). The objective of this investigation is to characterize and simulate the acoustic performance of different types of filters so that maximum benefit can be achieved. A number of after treatment device configurations for trucks were selected and investigated.

Finally, addressing the muffler design constraints, i.e., concerning space and pressure drop, a muffler optimization problem is formulated achieving the optimum muffler design through calculating the acoustic properties using an optimization technique. A shape optimization approach is presented for different muffler configurations, and the acoustic results are compared against optimum designs from the literature obtained using different optimization methods as well as design targets.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. iv, 18 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2012:31
Keyword
Exhaust systems, noise, pressure drop, 1D models, perforated mufflers, after treatment devices, optimization
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-103595 (URN)
Presentation
2012-10-14, Faculty of Engineering, Ain Shams university, Kairo, Egypt, 09:15 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20121016

Available from: 2012-10-16 Created: 2012-10-16 Last updated: 2013-04-11Bibliographically approved

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