In order to broaden the sound absorption bandwidth of a perforated panel in the low frequency range, a lightweight membrane-type resonator is installed in the back cavity of the perforated panel to combine into a compound sound absorber (CSA). Because of the great flexibility, the membrane-type resonator can be vibrated easily by the incident sound waves passing through the holes of the perforated panel. In the low frequency range, the membrane-type resonator and the perforated panel constitute a two degrees-of-freedom (DOF)-resonant type sound absorption system, which generates two sound absorption peaks. By tuning the parameters of the membrane type resonator, a wide frequency band having a large sound absorption coefficient can be obtained. In this paper, the sound absorption coefficient of CSA is derived analytically by combining the vibration equation of the membrane-type resonator with the acoustic impedance equation of the perforated panel. The influences of the parameters of the membrane-type resonator on the sound absorption performance of the CSA are numerically analyzed. Finally, the wide band sound absorption capacity of the CSA is validated by the experimental test.
Broadening of the Sound Absorption Bandwidth of the Perforated Panel Using a Membrane-Type Resonator
Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 2, 2017; final manuscript received November 22, 2017; published online February 9, 2018. Assoc. Editor: Miao Yu.
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Zhu, X., Chen, Z., Jiao, Y., and Wang, Y. (February 9, 2018). "Broadening of the Sound Absorption Bandwidth of the Perforated Panel Using a Membrane-Type Resonator." ASME. J. Vib. Acoust. June 2018; 140(3): 031014. https://doi.org/10.1115/1.4038942
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