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- W3211279195 abstract "Noise pollution is a common health hazard worldwide which is emitted along with chemical air pollutants, simultaneously from many sources. Some studies have been conducted to control these pollutants, simultaneously with promising results being achieved. Dielectric beads have been used in air pollution control technologies, successfully and probable effectiveness of them in noise reduction can be promising in dual use of them in the exhausts emitting noise and air pollution, simultaneously. In order to investigate the effectiveness of dielectric beads in noise reduction, two types of them; namely glass and ceramic beads, were placed separately inside the connecting tube of a double-expansion chamber muffler. Then the transmission loss (TL) of muffler was examined using impedance tube. A factorial design was used to evaluate and optimize the effect of noise related parameters on TL of such a system. Results show that the presence of dielectric beads has significant effect on TL of muffler. The maximum TL was obtained as 74.76 dB for muffler with ceramic beads, under the optimal condition of 5250 Hz and 120 dB. Measurement of TL and sound absorption coefficient (SAC) of glass and ceramic beads showed that the noise reduction in muffler with ceramic and glass beads is probably due to SAC in ceramic beads and noise reflections in glass beads, respectively. These results promise the dual use of dielectric beads in the exhausts emitting noise and air pollution simultaneously." @default.
- W3211279195 created "2021-11-08" @default.
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- W3211279195 date "2021-11-02" @default.
- W3211279195 modified "2023-10-16" @default.
- W3211279195 title "Improving the performance of double-expansion chamber muffler using dielectric beads; optimization using factorial design" @default.
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- W3211279195 doi "https://doi.org/10.1007/s40201-021-00749-z" @default.
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