DYNAMIC RESPONSE ANALYSIS OF RECTANGULAR PERFORATED PLATES WITH VARYING SIZES OF CIRCULAR PERFORATION HOLES

摘要

In this work vibration characteristics of rectangular perforated plates with varying sizes of circular perforation holes arranged in diagonal array are investigated. Natural frequencies of free vibration of the perforated plates and the corresponding mode shapes are obtained experimentally and also numerically. Numerical analysis of dynamic characteristics of perforated plates is carried out using ANSYS, the FEM analysis software package and the experimental analysis is carried out using FFT analyzer, accelerometer and impact hammer. Parameters defining the geometry of holes in a perforation array are presented, as well as the ratio of modal resonance frequencies of a perforate to those of a corresponding solid panel, termed the effective resonance frequency is introduced. In addition, the curve fitting technique is utilized to find the relationship of the mass remnant ratio with the effective resonance frequency. The functions obtained from curve fitting can be used to predict accurately the effective resonance frequencies of wide range of perforation geometries.