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Study of Perforated Mufflers of Circular and Elliptical Cross Sections Using Parametric Technique and Finite Element Methodology
Technical Paper
2007-01-0895
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a numerical study of reactive-type automotive mufflers. The main objective of the paper is to study the effects of various geometrical parameters on the muffler performance. Transmission losses (TL) are used to characterize the performance of the mufflers. Commercially available solver, ANSYS [1] is used to solve the muffler TL characteristics.
The paper also summarizes the development of a general-purpose program capable of modeling complex muffler cavities using ANSYS parametric design language (APDL). APDL is a scripting language that is used to automate common tasks and build the model in terms of parameters.
The program takes the key geometric parameters of the muffler as input variables and creates the muffler geometry, hexahedral-structured mesh, applies suitable boundary conditions, solves and then post-processes the results. The program provides good flexibility in creating complex (perforations) geometric models.
Perforated type mufflers are compared with the simple expansion type mufflers. A parametric analysis is then performed on the perforated type mufflers to study the effect of perforation density, effect of partitioning perforated mufflers using baffles, effect of baffles with holes and the effect of muffler shape. Both circular and elliptical mufflers are studied. These results are in good agreement with the available experimental results in literature.
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Citation
Dube, P. and Sajanpawar, P., "Study of Perforated Mufflers of Circular and Elliptical Cross Sections Using Parametric Technique and Finite Element Methodology," SAE Technical Paper 2007-01-0895, 2007, https://doi.org/10.4271/2007-01-0895.Also In
CAD/CAM/CAE Technology, Digital Modeling, Virtual Development and Engineering
Number: SP-2072; Published: 2007-04-16
Number: SP-2072; Published: 2007-04-16
References
- ANSYS 5.6, Theoretical manual & Online Help ANSYS Inc. Houston, U.S.A.
- Munjal M.L. “Acoustics of ducts and Mufflers with Application to Exhaust and Ventilation System Design” 0471847380 Wiley-Inter-science
- Smith P.H. Harrison, J.C. “The Scientific Design of Exhaust and Intake System 2 nd 61797
- Young C.I.J. Crocker M.J. “Prediction of Transmission Loss in Muffler by Finite Element Method” Journal of Acoustical Society of America 57 144 148 1975
- Kagawa Y. Omate T. ” Finite Element Simulation of Acoustics filters of arbitrary profile with Circular cross section” The Journal of the Acoustical Society of America November 1976 60 5 1003 1013
- Petyt M. Leas J. Koopman G.H. “A finite element method for determining the acoustic modes of irregular shaped cavities Journal of Sound and Vibrations 45 1976 495 502
- Patil A.R. Sajanpawar P.R. Masurekar V.V. ” Acoustic Three Dimensional Finite Element Analysis of a Muffler” Society of Automotive Engineers February 1996 SP-1147