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Improving the performance of double-expansion chamber muffler using dielectric beads; optimization using factorial design

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Abstract

Purpose

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.

Methods

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

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.

Conclusion

These results promise the dual use of dielectric beads in the exhausts emitting noise and air pollution simultaneously.

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Acknowledgements

This research was financially supported by the Tarbiat Modares University of Tehran which is appreciated. Special thanks are due to Dr. Seyyed Mohammad Mousavi for his kind helps during the course of this research. The authors are also grateful to Stat-Ease, Minneapolis, MN, USA, for the provision of the Design Expert package.

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Authors and Affiliations

  1. Department of Occupational Health Engineering, Faculty of Health, Semnan University of Medical Sciences, Semnan, Iran

    Niloofar Damyar

  2. Tarbiat Modares University, Tehran, Iran

    Niloofar Damyar

  3. Department of Occupational Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran

    Fariba Mansouri, Ali Khavanin & Hasan Asilian

  4. Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran

    Ahmad Jonidi Jafari

  5. Department of Occupational Health Engineering, School of Public Health, Mashhad University of Medical Sciences, Mashhad, Iran

    Ramazan Mirzaei

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  1. Niloofar Damyar
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  2. Fariba Mansouri
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  3. Ali Khavanin
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  4. Ahmad Jonidi Jafari
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  5. Hasan Asilian
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  6. Ramazan Mirzaei
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Correspondence to Ali Khavanin.

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Damyar, N., Mansouri, F., Khavanin, A. et al. Improving the performance of double-expansion chamber muffler using dielectric beads; optimization using factorial design. J Environ Health Sci Engineer 19, 1979–1985 (2021). https://doi.org/10.1007/s40201-021-00749-z

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  • DOI: https://doi.org/10.1007/s40201-021-00749-z

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