Muffler modeling by transfer matrix method and experimental verification

Gerges, Samir N. Y.; Jordan, Roberto; Thieme, F. A.; Coelho, José; Arenas, Jorge P.

doi:10.1590/s1678-58782005000200005

Cited by 40 publications

(43 citation statements)

References 27 publications

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“…We study the performance of the simulation and optimization method with four test cases, which are taken from Gerges et al, 8 Chiu et al, 12 and Chiu. 17 The goals of the tests are first to validate the simulation model with practical measurements and to study the accuracy of the outgoing boundary condition.…”

Section: -16mentioning

confidence: 99%

“…17 The goals of the tests are first to validate the simulation model with practical measurements and to study the accuracy of the outgoing boundary condition. We use the first test case from Gerges et al 8 for this purpose. The results also demonstrate the better accuracy of the FEM method in comparison with the TMM.…”

Section: -16mentioning

confidence: 99%

“…Three optimization test cases are used to find optimal dimensions or perforation parameters for typical reflective mufflers. The first optimization case is taken from Gerges et al, 8 and it represents a muffler with a perforated duct, where shape and perforation parameters are optimized. The second optimization test case is taken from Chiu, 17 and it represents a more complicated reverse-flow type muffler geometry.…”

Section: -16mentioning

confidence: 99%

“…The hybrid numerical method is validated by comparing the numerically evaluated transmission loss values to the experimental results reported by Gerges et al 8 The first test in Gerges et al…”

Section: Numerical Experiments a Validation Of The Hybrid Modelmentioning

confidence: 99%

“…There is a clear consistency between the results, and it can be concluded that the hybrid method predicts the transmission loss behavior very accurately in chosen test problem. Gerges et al 8 reports also TL values obtained with the transfer matrix method, which gives accurate results for frequencies below 2000 Hz. However, above 2000 Hz the results of the transfer matrix method differ significantly from the experimental results, whereas the hybrid method gives reasonable accuracy over the whole frequency range.…”

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Multiobjective muffler shape optimization with hybrid acoustics modeling

Airaksinen

Heikkola

2011

The Journal of the Acoustical Society of America

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This paper considers the combined use of a hybrid numerical method for the modeling of acoustic mufflers and a genetic algorithm for multiobjective optimization. The hybrid numerical method provides accurate modeling of sound propagation in uniform waveguides with non-uniform obstructions. It is based on coupling a wave based modal solution in the uniform sections of the waveguide to a finite element solution in the non-uniform component. Finite element method provides flexible modeling of complicated geometries, varying material parameters, and boundary conditions, while the wave based solution leads to accurate treatment of non-reflecting boundaries and straightforward computation of the transmission loss (TL) of the muffler. The goal of optimization is to maximize TL at multiple frequency ranges simultaneously by adjusting chosen shape parameters of the muffler. This task is formulated as a multiobjective optimization problem with the objectives depending on the solution of the simulation model. NSGA-II genetic algorithm is used for solving the multiobjective optimization problem. Genetic algorithms can be easily combined with different simulation methods, and they are not sensitive to the smoothness properties of the objective functions. Numerical experiments demonstrate the accuracy and feasibility of the model-based optimization method in muffler design.

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Section: -16mentioning

confidence: 99%

Section: -16mentioning

confidence: 99%

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confidence: 99%

Section: Numerical Experiments a Validation Of The Hybrid Modelmentioning

confidence: 99%

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