Effects of Parameters of Helmholtz Resonator on Transmission Loss of Hybrid Muffler

  • Authors

    • Thiha Zaw
    • Aminudin Abu
    • Noor Fawazi
    • A M. Wahab
    2018-08-01
    https://doi.org/10.14419/ijet.v7i3.17.16641
  • Expansion chamber, Helmholtz resonator, Hybrid muffler, Transfer matrix method, Transmission loss.
  • Abstract

    Expansion chamber and Helmholtz resonators are widely used in noise control. In this paper, they are combined to use as a hybrid muffler. The analysis is done to investigate the influence of the parameters of Helmholtz resonator on transmission loss. The transfer matrix method is used in the analysis. The result of transmission loss from the transfer matrix method is validated with the result from experimental two-load method using four microphones impedance tube. After had the transmission loss of the hybrid muffler been validated, the study was proceeded to investigate the effects of parameters of Helmholtz resonator on the transmission loss. The root mean square value of transmission loss were also calculated to compare the transmission losses clearly. In this paper, we investigated the effect of length of the neck of Helmholtz resonator, the effect of diameter of the neck of Helmholtz resonator, the effect of the length of the Helmholtz resonator cavity and the effect of the diameter of the Helmholtz resonator cavity for stationary medium. It is found that the transmission loss is increased when the diameter of the neck of Helmholtz resonator is increased. When the length of the neck is reduced, the transmission loss is increased. The transmission loss can also be increased by reducing the diameter of resonator cavity. It is better to increase the transmission loss at low frequencies by increasing the length of the resonator cavity.

     

     

  • References

    1. [1] Potente, D. General design principles for an automotive muffler. in Proceedings of ACOUSTICS. 2005.

      [2] Rahul D. Nazirkar, S.R.M., Amol D. Namdas, Suraj U. Navagire, Sumit S. Devarshi. Design & Optimization of Exhaust Muffler & Design Validation. in 10th IRF International Conference. 2014. Pune, India.

      [3] Xu, M.B., A. Selamet, and H. Kim, Dual Helmholtz resonator. Applied Acoustics, 2010. 71(9): p. 822-829.

      [4] Wu, C.J., X.J. Wang, and H.B. Tang, Transmission loss prediction on SIDO and DISO expansion-chamber mufflers with rectangular section by using the collocation approach. International Journal of Mechanical Sciences, 2007. 49(7): p. 872-877.

      [5] Shao, Y.-l., A Study on Exhaust Muffler Using a Mixture of Counter-phase Counteract and Split-gas Rushing. Procedia Engineering, 2011. 15: p. 4409-4413.

      [6] Chiu, M.-C., Shape optimization of one-chamber perforated mufflers filled with wool using simulated annealing. Journal of Marine Science and Technology, 2013. 21(4): p. 380-390.

      [7] Gerges, S.N.Y., et al., Muffler modeling by transfer matrix method and experimental verification. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2005. 27: p. 132-140.

      [8] Bugaru, M., O. Vasile, and N. Enescu. The Mufflers modeling by transfer matrix method. in Proceedings of the 10th WSEAS International Conference on APPLIED MATHEMATICS. 2006. World Scientific and Engineering Academy and Society (WSEAS).

      [9] Munjal, M.L., Acoustics of ducts and mufflers. Second ed. 2014, Chichester, West Sussex, United Kingdom: John Wiley & Sons, Inc.

      [10] G. Campa, S.M.C. Application of Transfer Matrix Method in Acoustics. in COMSOL conference. 2010. Paris.

      [11] Andersen, K. Analyzing muffler performance using the transfer matrix method. in COMSOL Conference. 2008.

      [12] Singh, S., C.H. Hansen, and C.Q. Howard. A detailed tutorial for evaluating in-duct net acoustic power transmission in a circular duct with an attached cylindrical Helmholtz resonator using transfer matrix method. in Acoustics 2008. 2008. Geelong, Victoria, Australia.

      [13] Selamet, A. and Z. Ji, Circular asymmetric Helmholtz resonators. The Journal of the Acoustical Society of America, 2000. 107(5): p. 2360-2369.

      [14] Ji, Z.L., Acoustic length correction of closed cylindrical side-branched tube. Journal of Sound and Vibration, 2005. 283(3–5): p. 1180-1186.

      [15] Munjal, M.L. and A.G. Doige, Theory of a two source-location method for direct experimental evaluation of the four-pole parameters of an aeroacoustic element. Journal of Sound and Vibration, 1990. 141(2): p. 323-333.

      [16] Tao, Z. and A. Seybert, A review of current techniques for measuring muffler transmission loss. SAE Technical Paper, 2003(2003-01): p. 1653.

      [17] Yang, D.K.W., Y.A. Abakr, and N.M. Ghazali, Experimental Investigations on the Effects of Coiling and Bends on the Sound Energy Losses through a Resonator Tube. Procedia Engineering, 2013. 56: p. 842-848.

      [18] D. K. W. Yang, Y.A.A., Experimental Determination of Acoustic Losses in an Acoustic Resonator Using Impedance Tube Technique. Applied Mechanics and Materials, 2014. 471: p. 361-366.

      [19] Hua, X., Y. Zhang, and D.W. Herrin, The effect of conical adapters and choice of reference microphone when using the two-load method for measuring muffler transmission loss. Applied Acoustics, 2015. 93: p. 75-87.

      [20] Hua, X. and D.W. Herrin, Practical Considerations when using the Two-Load Method to Determine the Transmission Loss of Mufflers and Silencers. SAE Int. J. Passeng. Cars - Mech. Syst., 2013. 6(2): p. 1094-1101.

      [21] Mylaudy Dr. S. Rajadurai, G.R., S. Mathan kumar, Sound Transmission Loss Measurement Accuracy Reqirement in Low Frequency Range. International Journal of Recent Development in Engineering and Technology, 2015. 4(5).

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  • How to Cite

    Zaw, T., Abu, A., Fawazi, N., & M. Wahab, A. (2018). Effects of Parameters of Helmholtz Resonator on Transmission Loss of Hybrid Muffler. International Journal of Engineering & Technology, 7(3.17), 151-157. https://doi.org/10.14419/ijet.v7i3.17.16641

    Received date: 2018-07-31

    Accepted date: 2018-07-31

    Published date: 2018-08-01