CONSIDERATIONS ON THE MANUFACTURING OF SOUND ABSORBING MPP SAMPLES FOR THE IMPEDANCE TUBE

Mihai PINTEA, Adrian COROIAN, Iulian LUPEA

Abstract


In the present paper some aspects of the manufacturing of microperforated panels (MPPs) for creating MPP samples are presented. MPP samples are used in impedance tubes to asses and improve the sound absorption coefficient of various sound absorbing structures. MPP materials like Aluminum, polycarbonate, plywood and cardboard are under observation. They can be used with sound absorbing materials of various thickness and perforations of different patterns and sub-millimeter holes in diameter. Laser cutting and drilling, laser engraving and drilling and 3D printing samples were manufactured and shown by images. The influence of the deviations from the cylindrical shape on the absorption coefficient will be assessed in the future.

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References


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