Abstract
The one-dimensional analytical approach is developed to predict and analyze the acoustic attenuation performance of three-pass perforated tube muffler with perforated bulkhead(s) and validated by comparing the transmission loss results from one-dimensional analytical approach and finite element method. The one-dimensional analytical approach is then used to investigate the effect of perforated bulkhead(s) on the acoustic attenuation performance of three-pass perforated tube reactive and hybrid mufflers. The results indicated that perforates on the bulkhead may change the resonant frequency of the three-pass perforated tube reactive muffler, and the resonance frequency is shifted to higher frequency with the increase in the porosity of perforation. The sound-absorbing material filling in the middle chamber may improve the acoustic attenuation performance of the mufflers from middle to high frequencies, while the acoustic attenuation performance around the resonance frequencies is lowered somewhat; therefore, a flatter acoustic response may be formed for the hybrid muffler than the reactive muffler.
Highlights
Three-pass perforated tube mufflers are widely used in automotive exhaust systems to reduce the engine exhaust noise
Sanchez-Orgaz et al.[6] proposed for the acoustic analysis of automotive silencers including a perforated duct with uniform axial mean flow and an outer chamber with heterogeneous absorbent material in terms of 3D finite element method (FEM)
Ji and Fang[7] developed the 1D analytical approach to predict the acoustic attenuation performance of the three-pass perforated tube muffler with end-resonator, and the predictions of transmission loss are validated by comparing the FEM and boundary element method (BEM) results
Summary
Three-pass perforated tube mufflers are widely used in automotive exhaust systems to reduce the engine exhaust noise. Munjal[1,2] and Selamet et al.[3] presented the one-dimensional (1D) frequency-domain approaches, and Dickey et al.[4] developed the 1D timedomain approach to predict the acoustic attenuation performance of the typical three-pass perforated tube mufflers. Ji and Selamet[5] employed the three-dimensional (3D) boundary element method (BEM) to predict the acoustic attenuation performance of the typical three-pass perforated tube muffler, and the BEM predictions agree well with experiments for a prototype muffler in the frequency range of interest. Ji and Fang[7] developed the 1D analytical approach to predict the acoustic attenuation performance of the three-pass perforated tube muffler with end-resonator, and the predictions of transmission loss are validated by comparing the FEM and BEM results.
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