Computer Aided Design on Single Expansion Muffler with Extended Tube under Space Constraints

Ying-Chun Chang; Long-Jyi  Yeh; Min-Chie  Chiu; Gaung-Jer Lai

doi:10.6180/jase.2004.7.3.08

Computer Aided Design on Single Expansion Muffler with Extended Tube under Space Constraints

Ying-Chun Chang This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Long-Jyi Yeh¹, Min-Chie Chiu¹ and Gaung-Jer Lai¹

¹Department of Mechanical Engineering Tatung University Taipei, Taiwan 104, R.O.C

Received: November 26, 2003
Accepted: February 11, 2004
Publication Date: September 1, 2004

Download Citation: ||https://doi.org/10.6180/jase.2004.7.3.08

ABSTRACT

The optimization approach of maximal STL (sound transmission loss) and muffler dimension under space constraints within a building or machine room is fully addressed throughout the graphic analyses as well as the computer-aided numerical assessments in this paper. The primary set of design data is derived by the computer graphic analysis on sensitivity, and the successive algorithm of iteration techniques based on the initial design data is then carried out individually. These results are moreover compared with each other for the accuracy purpose. The theoretical and simulated results are found in good agreements. The optimal approach on the design of single expansion muffler with extended tube proposed in this study surely provides a quick and economical procedure to optimize the single expansion muffler with the maximal sound transmission loss under space limitations without redundant testing.

Keywords: Plane Wave, Optimal Design, Single Chamber Muffler with Extended Tube, Computer Aided Design, Numerical Assessment.

REFERENCES

[1] Bernhard, J., “Shape Optimization of Reactive Mufflers,” Noise Control Engineering Journal, Vol. 27(1), pp. 1017 (1986).
[2] Yeh, L. J., Chiu, M. C.and Lay, G. J., “Computer Aided Design on Single Expansion Muffler under Space Constraints,” The 19th National Conference on C.S.M.E., C7, pp. 625633 (2002).
[3] Munjal, M. L., “Plane Wave Analysis of Side Inlet/Outlet Chamber Mufflers with Mean Flow,” Applied Acoustics, 52, pp. 165175 (1997).
[4] Prasad, M. G., “A Note on Acoustic Plane Waves in a Uniform Pipe with Mean Flow,” Journal of Sound and Vibration, 95(2), pp. 284290 (1984).
[5] Munjal, M. L. and Prasad, M. G., “Transfer Matrix of a Uniform Tube with Moving Medium and Linear Temperature Gradient,” J. Acoust. Soc. Am., Vol. 80(50), pp. 15011506 (1986).
[6] Munjal, M. L., Acoustics of Ducts and Mufflers with Application to Exhaust and Ventilation System Design, John Wiley & Sons, N.Y. U.S.A. (1987).
[7] Sathyanarayana, Y. and Munjal, M. L., “A Hybrid Approach for Aeroacoustic Analysis of the Engine Exhaust System,“ Applied Acoustics, Vol. 60, pp. 425450 (2000).
[8] Vanderplaats, Garret N., “Numerical Optimization Techniques for Engineering Design: with Applications,” McGraw-Hill, NY. U.S.A., pp. 71195 (1984).