Modelling and experimental investigation on perforated plate mobility

Cheah, Yee Mun (2013) Modelling and experimental investigation on perforated plate mobility. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Porous materials are usually applied to noise control. The application of perforated plate is widely used in sound absorption purposes as it reduces sound radiation. However, perforation of the plate has a decreasing effect on the plate stiffness thus increasing its vibration. Therefore, a modeling and experimental investigation on perforation’s effects is performed. This report discusses the effect of the perforation on the plate mobility. The perforation ratio could be affected by the numbers of holes, diameter of the holes, and arrangement of the perforation. In this project, Finite Element Analysis – Patran and Nastran was employed to obtain the discrete surface vibration velocity on a single analytical model. The natural frequency of the Finite Element Analysis solid plate model was compare with the theoretical calculation to validate the accuracy of the modeling. The result obtained from the Finite Element Analysis was compared with the solid plate to show the effect of perforation on plate mobility, which increases as the perforation ratio increases. An experimental investigation was carried out to validate the results from the analysis earlier.

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