Most buildings such as hospitals, hotels, governmental offices, data processing rooms, etc, are equipped with internal combustion engines, diesel motors and generators to supply energy in emergencies. These same IC engines are used for industrial applications, building services and transportation. Exhaust noise are the predominant noise source with most internal combustion engines and thus exhaust systems incorporating mufflers have been designed to reduce the noise. This paper describes the analysis of several configurations of mufflers and also presents comparisons between the results for the transmission loss obtained by numerical modelling (FEM), Transfer Matrix Method (TMM) and measurements.
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References
1.
KimuraM.R.M. (1995), “Acoustic Measurements and Simulation of Mufflers”, MSc thesis, Federal University of Santa Catarina. Brazil (in Portuguese).
2.
BauerA.B. (1977). “Impedance theory and measurements on porous acoustic liners”, Journal of Aircraft, 14(8): 720-728.
3.
MunjalM.L. (1987). Acoustics of ducts and mufflers, John Wiley, New York.
4.
PanickerV.B. and MunjalM.L. (1981), “Aeroacoustic analysis of straight-trough mufflers with simple and extended tube expansion chambers”, Journal of the Indian Institute of Science, 63(A): 1-19.
5.
PanickerV.B. and MunjalM.L. (1981). “Aeroacoustic analysis of mufflers with flow reversals”. Journal of the Indian Institute of Science, 63(A): 21-38.
6.
SullivanJ.W. and CrockerM.J. (1978), “Analysis of concentric-tube resonators having unpartioned cavities”, Journal of the Acoustical Society of America, 64(1): 207-215.
7.
ChungJ.Y. and BlaserD.A. (1980), “Transfer function method of measuring in-duct acoustic properties. I. Theory”, Journal of the Acoustical Society of America, 68(3): 907-921.
8.
BodénH. and AbomM. (1986), “Influence of errors on the two-microphone method goes measuring acoustic properties in ducts”. Journal of the Acoustical Society of America, 79(2): 541-549.
9.
IgarashiJ. and ToyamaM. (1958), “Fundamentals of acoustical silencers (I)”. Report No. 339, Aeronautical Research Institute, University of Tokyo, 223–241.
10.
IgarashiJ. and AraiM. (1960), “Fundamentals of acoustical silencers (III)”, Report No. 351, Aeronautical Research Institute, University of Tokyo, 17–31.
11.
GergesS.N.Y. (1992), “Rufdo: Fundamentos and Control”, UFSC, Florianópolis.
12.
BodénH. and AbomM. (1984), “Two-microphone measurements in the wave region of ducts planes”, Report TRITA-TAK n. 8401, Department of Technical Acoustics. Royal Institute of Technology, Stockholm.
13.
MellingT.H. (1973), “The acoustic impedance of perforates at medium and high sound pressure levels”. Journal of Sound and Vibration, 29(1): 1-65.
14.
BeranekL.L. and VérI.L. (1992), “Noise and Vibration Control Engineering – Principles and Applications”, John Wiley; New York.
ChuW.T. (1986), “Transfer function technique goes impedance and absorption measurements in an impedance tube using the single microphone”. Journal of the Acoustical Society of America, 80(2): 555-560.
