Shape Optimization of One-Chamber Cross-Flow Mufflers by GA Optimization

Author:

Chang Y.-C.,Chiu M.-C.

Abstract

ABSTRACTIn order to reduce the venting noise within a confined room, the development of a high performance muffler within certain space constraints is imperative. Therefore, the main purpose of this paper is to develop an optimally shaped one-chamber cross-flow perforated muffler that will dramatically increase the acoustical performance within a limited space.On the basis of plane wave theory, a four-pole system matrix for evaluating acoustical performance is derived by using a decoupled numerical method. Moreover, in order to search for a global optimum, a genetic algorithm (GA) with tournament selection in elitism and uniform crossover/mutation (analogous to a genes' evolutionary process) has been used for the mufflers' optimization. To assure the GAs' correctness, the STLs' maximization of one-chamber cross-flow perforated mufflers with respect to three targeted frequencies (200, 400, and 800Hz) is exemplified. Furthermore, a numerical case for dealing with an octave band noise emitted from an air compressor using one-chamber cross-flow mufflers has been introduced and fully discussed. To achieve a better optimization with the GA, various GA parameter sets were used. Before the GA operation is carried out, the mathematical models of cross-flow perforated mufflers are verified by comparing the numerical result and experimental data with those obtained by Sullivan and Wu respectively.Consequently, the results reveal that the acoustical performance for a cross-flow perforated muffler is excellent. Moreover, they reveal that the optimization approach proposed in this study is easy, economical, and quite effective.

Publisher

Oxford University Press (OUP)

Subject

Applied Mathematics,Mechanical Engineering,Condensed Matter Physics

Reference19 articles.

1. Analysis of concentric‐tube resonators having unpartitioned cavities

2. Shape Optimization on Constrained Single-Chamber Muffler by Using GA Method and Mathematical Gradient Method;Chang;International Journal of Acoustics and Vibration,2005

3. Experimental Evaluation of Impedance of Perforates with Grazing Flow;Rao;Journal of Sound and Vibration,1986

4. Dynamic Analysis and Ride Quality Evaluation of Railway Vehicles – Numerical Simulation and Field Test Verification

5. BOUNDARY ELEMENT ANALYSIS OF MUFFLERS WITH AN IMPROVED METHOD FOR DERIVING THE FOUR-POLE PARAMETERS

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