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Micro perforated panels (MPP) find wide application in acoustics due to their effective sound absorption at low frequencies. The real challenge posed by MPP is their fabrication due to the sub-millimeter pores they possess. In this paper, MPP samples of various pore diameter, spacing and panel thickness are fabricated in a 3 D printer with a very high resolution. The acoustical parameter such as sound absorption coefficient of MPP is measured experimentally using the two microphone impedance tube setup. Moreover, the transfer matrix method is used to validate the results obtained by experimental method. The comparison of results from both methods show a very good agreement with each other. The sound absorption of MPP can be improved by adjusting their diameter, spacing and thickness. The results of this paper give a new insight to develop MPP for acoustic applications.
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