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Optimisation of Multistep Cavity Configuration to Extend Absorption Bandwidth of Micro Perforated Panel Absorber

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Treść / Zawartość
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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Micro perforated panel (MPP) absorber is a new form of acoustic absorbing material in comparison with porous ones. These absorbers are considered as next generation ones and the best alternative for traditional porous materials like foams. MPP combined with a uniform air gap constructs an absorber which has high absorption but in a narrow bandwidth of frequency. This characteristic makes MPPAs insufficient for practical purposes in comparison with porous materials. In this study instead of using a uniform air gap behind the MPP, the cavity is divided into several partitions with different depth arrangement which have parallel faces. This method improves the absorption bandwidth to reach the looked for goal. To achieve theoretical absorption of this absorber, equivalent electro-acoustic circuit and Maa’s theory (MAA, 1998) are employed. Maa suggested formulas to calculate MPP’s impedance which show good match with experimental results carried out in previous studies. Electro-acoustic analogy is used to combine MPP’s impedance with acoustic impedances of complex partitioned cavity. To verify the theoretical analyses, constructed samples are experimentally tested via impedance tube. To establish the test, a multi-depth setup facing a MPP is inserted into impedance tube and the absorption coefficient is examined in the 63-1600 Hz frequency range. Theoretical results show good agreement compared to measured data, by which a conclusion can be made that partitioning the cavity behind MPP into different depths will improve absorption bandwidth and the electro-acoustic analogy is an appropriate theoretical method for absorption enhancement research, although an optimisation process is needed to achieve best results to prove the capability of this absorber. The optimisation process provides maximum possible absorption in a desired frequency range for a specified cavity configuration by giving the proper cavity depths. In this article numerical optimisation has been done to find cavity depths for a unique MPP.
Rocznik
Strony
187--195
Opis fizyczny
Bibliogr. 17 poz., fot., rys., tab., wykr.
Twórcy
autor
  • Acoustics Research Lab., Department of Mechanical Engineering, Amirkabir University of Technology, No. 424, Hafez Avenue, Tehran 15914, Iran
autor
  • Acoustics Research Lab., Department of Mechanical Engineering, Amirkabir University of Technology, No. 424, Hafez Avenue, Tehran 15914, Iran
Bibliografia
  • 1. Allam S., Åbom M. (2011), A new type of muffler based on microperforated tubes, Journal of vibration and acoustics, 133, 3, 031005, doi: 10.1115/1.4002956.
  • 2. Crandall I. B. (1926), Theory of vibrating systems and sound, D. Van Nostrand Company, New York.
  • 3. Falsafi I., Ohadi A. (2015), Improving absorption bandwidth of micro-perforated panel by stepping the cavity, [in:] Proceedings of 22nd International Congress on Sound and Vibration, Vol. 2, M. J. Crocker, F. Pedrielli, S. Luzzi, M. Pawelczyk, E. Carletti [Eds.], pp. 3828-3835, Florence, Italy, 12-16 July.
  • 4. ISO 10534-2 (1998), Acoustics-determination of sound absorption coefficient and impedance in impedance tubes – Part 2: Transfer-function method.
  • 5. Kabral R., Rämmal H., Lavrentjev J. (2012), Acoustic Studies of Micro-Perforates for Small Engine Silencers, SAE Technical Paper 2012-32-0107, https://doi.org/10.4271/2012-32-0107.
  • 6. Kang J., Fuchs H. (1999), Predicting the absorption of open weave textiles and micro-perforated membranes backed by an air space, Journal of Sound and Vibration, 220, 5, 905-920, doi: 10.1006/jsvi.1998.1977.
  • 7. Li G., Mechefske C. K. (2010), A comprehensive experimental study of micro-perforated panel acoustic absorbers in MRI scanners, Magnetic Resonance Materials in Physics, Biology and Medicine, 23, 3, 177-185, doi: 10.1007/s10334-010-0216-9.
  • 8. Liu J., Herrin D., Seybert A. (2007), Application of micro-perforated panels to attenuate noise in a duct, SAE Technical Paper 2007-01-2196, https://doi.org/10.4271/2007-01-2196.
  • 9. Maa D. Y. (1975), Theory and design of microperforated panel sound-absorbing constructions, Scientia Sinica, 18, 1, 55-71.
  • 10. Maa D. Y. (1998), Potential of microperforated panel absorber, Journal of the Acoustical Society of America, 104, 5, 2861-2866, doi: 10.1121/1.423870.
  • 11. Masson F., Kogan P., Herrera G. (2008), Optimization of muffler transmission loss by using microperforated panels, FIA2008, Buenos Aires.
  • 12. Rayleigh J. W. S. B. (1896), The theory of sound, Vol. 2, Macmillan, London.
  • 13. Ruiz H., Cobo P., Jacobsen F. (2011), Optimization of multiple-layer microperforated panels by simulated annealing, Applied Acoustics, 72, 10, 772-776, doi: 10.1016/j.apacoust.2011.04.010.
  • 14. Wang C., Cheng L., Pan J., Yu G. (2010), Sound absorption of a micro-perforated panel backed by an irregular-shaped cavity, Journal of the Acoustical Society of America, 127, 1, 238-246, doi: 10.1121/1.3257590.
  • 15. Wang C., Huang L. (2011), On the acoustic properties of parallel arrangement of multiple microperforated panel absorbers with different cavity depths, Journal of the Acoustical Society of America, 130, 1, 208-218, doi: 10.1121/1.3596459.
  • 16. Yairi M., Sakagami K., Takebayashi K., Morimoto M. (2011), Excess sound absorption at normal incidence by two microperforated panel absorbers with different impedance, Acoustical Science and Technology, 32, 5, 194-200, doi: 10.1250/ast.32.194.
  • 17. Zou J., Shen Y., Yang J., Qiu X. (2006), A note on the prediction method of reverberation absorption coefficient of double layer micro-perforated membrane, Applied Acoustics, 67, 2, 106-111, doi: 10.1016/j.apacoust.2005.05.004.
Uwagi
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-776c5bbf-4eef-4f51-8a7d-78333cb8d6d6
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