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Shenzhen, China

Bi R.,Hefei University of Technology | Liu Z.,Hefei University of Technology | Lu Y.,Hefei University of Technology | Mai H.,Shenzhen ZYME Industry Co. | Liu H.,Hefei University of Technology
Qiche Gongcheng/Automotive Engineering | Year: 2014

The acoustic performance of multi-inlet multi-outlet reactive muffler is investigated by using three-dimensional analytical technique and finite element method. The effects of the relative angle, offset and number of inlet and outlet tubes as well as the structural parameter of perforated tube on the acoustic behavior of muffler is explored. The results show that the relative angle and offset of inlet and outlet tubes have certain influence on the acoustic characteristic of muffler. Sound attenuation in low and medium frequencies can be increased by adding tail tube expander and internal insertion tube. Muffler with perforated tube and multiple expansion chambers shows better performance in medium and high frequencies. Finally it is concluded that the muffler with multi-inlet and multi-outlet has better behavior in both acoustic and resistance performances. Source

Liu Z.-S.,Hefei University of Technology | Bi R.,Hefei University of Technology | Mai H.-T.,Shenzhen ZYME Industry Co. | Lu Y.-M.,Hefei University of Technology | Wang Y.,Hefei University of Technology
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2012

Two-dimensional analytical method is used to analyze the acoustic performance of pass-through and cross-flow dissipative mufflers. The effect of structural parameters of perforated screen and flow resistivity and thickness of sound absorbing material on acoustic performance of muffler was investigated. The acoustic behaviors of pass-through and cross-through dissipative muffler were compared with those of straight-through dissipative muffler. With increasing hole diameter, acoustic attenuation of cross-flow muffler decreases in high frequency and performance of pass-through muffler improves. Sound attenuation of cross-flow muffler in middle and high frequency increases and acoustic performance of pass-through muffler deteriorates with increasing porosity. Acoustic performance of dissipative muffler can be improved by increasing flow resistivity and thickness of sound absorbing material. Cross-flow dissipative muffler is appropriate for sound attenuation in low and middle frequencies and pass-through dissipative muffler shows better performance in high frequency. Source

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