In this paper, an extensive work on the natural frequency of perforated plate has
been made by introducing micro-holes on the plate. The micro-holes, which is known
to have a remarkable performance in several applications, were arranged diagonally
among the perforated holes in order to make a new combination of micro-macro
perforated plate. A 3D geometrical model of the plate was made in the Autodesk
Inventor and the Finite Element (FE) simulation was employed to calculate the
natural frequency and visualize the mode shape. Four models were made with
various micro-holes diameter starting from 0,25, 0,5, 0,75 and 0,9 mm, respectively.
The macro holes diameter, however, was kept constant to be 1,5 mm purposely to
know the effect of micro holes in particular. The results from the models were then
compared to a single perforated plate (PP) for clarification. It is found that the micro
holes gives considerable effect to the perforated plate natural frequency. Similar to
the author previous findings, the diameter of the micro holes is proportional to the
natural frequency reduction.