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Application of Neural Network and Genetic Algorithm to the Optimum Design of Perforated Tube Mufflers

Published online by Cambridge University Press:  05 May 2011

M.-C. Chiu  and
Y.-C. Chang
M.-C. Chiu*
Affiliation:
Department of Automatic Control Engineering, Chungchou Institute of Technology, Changhua, Taiwan 51003, R.O.C.
Y.-C. Chang*
Affiliation:
Department of Mechanical Engineering, Tatung University, Taipei, Taiwan 10452, R.O.C.
*
* Assisstant Professor, corresponding author
** Associate Professor
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Abstract

Research on new techniques of perforated silencers has been well addressed. However, the research work on shape optimization for a volume-constrained silencer within a constrained machine room is rare. Therefore, the optimum design of mufflers becomes an essential issue. In this paper, to simplify the optimum process, a simplified mathematical model of the muffler is constructed with a neural network using a series of input design data (muffle dimensions) and output data (theoretical sound transmission loss) obtained by a theoretical mathematical model (TMM). To assess the optimal mufflers, the neural network model (NNM) is used as an objective function in conjunction with a genetic algorithm (GA). Moreover, the numerical cases of sound elimination with respect to pure tones (500, 1000, 2000Hz) are exemplified and discussed.

Before the GA operation can be carried out, the accuracy of the TMM is checked by Crocker's experimental data. In addition, both the TMM and NNM are compared. It is found that the TMM and the experimental data are in agreement. Moreover, the TMM and NNM confirm.

The results reveal that the maximum value of the sound transmission loss (STL) can be optimally obtained at the desired frequencies. Consequently, it is obvious that the optimum algorithm proposed in this study can provide an efficient way to develop optimal silencers.

Keywords

Generalized decoupling techniquePerforated mufflerNeural network modelOptimizationGenetic algorithm
Type
Technical Note
Information
Journal of Mechanics , Volume 25 , Issue 3 , September 2009 , pp. N7 - N16
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2009

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