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Insight into exhaust systems optimization techniques
Ain Shams University, Sound and Vibration Lab., Egypt.
Ain Shams University, Sound and Vibration Lab., Egypt.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0001-7898-8643
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0003-4103-0129
2010 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Exhaust system mufflers should be carefully designed for different applications. The main objective of an exhaust system is to reduce the engine noise. Maximum acoustic performance is usually desired under the limit of space constraints. Therefore obtaining the muffler optimum design is very crucial. In this paper, the muffler optimization problem is formulated allowing getting the optimum muffler design through calculating the acoustic properties conjugated with the optimization technique using a function "fmincon" from the MATLAB optimization tool-box that finds the minimum of a constrained nonlinear multivariable function. There are several possibilities to evaluate the acoustic performance of a muffler such as the sound transmission loss, the insertion loss, and the acoustic pressure measured by a receiver outside the exhaust system opening. By selecting one of these design targets, the optimum design of a specific muffler configuration in the frequency range of interest can be obtained. In this paper, a shape optimization approach is presented for different mufflers configurations, and the results of transmission loss, insertion loss, and the outside acoustic pressure are compared against optimum designs from the literature obtained using different optimization methods as well as design targets.

Place, publisher, year, edition, pages
2010.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-103697Scopus ID: 2-s2.0-84871449120OAI: oai:DiVA.org:kth-103697DiVA: diva2:561265
Conference
17th International Congress of Sound and Vibration, Cairo (2010)
Note

QC 20121018

Available from: 2012-10-18 Created: 2012-10-18 Last updated: 2016-09-20Bibliographically 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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