ABSTRACT
In the previous decades, many numerical and experimental investigations on the
capabilities of periodic structures for vibration attenuation and localization were
performed and proved those capabilities for different simple structures. Earlier
investigation of such phenomenon in periodic plates was not promising due to
different factors. In this research, experimental and numerical investigations of the
vibration response of different periodic plates are investigated to examine similar
behavior of periodic plates. Three different periodic configurations were tested under
‘almost' free support boundary conditions. This work is an important over that
performed by Hull [9]. Milled plates are used to avoid the effect of the adhesive
material in damping which was used [3]. The experiments involved the excitation
from one corner of the square plate and measuring the response at the three other
corners. The results were compared to that of a similar size plain plate. The results
indicated the reduction of the response of the periodic plates, which have overall less
weight, by ratios that may exceed 10 db in different frequency bands. The results of
this work, verified by experiments, encourage more investigation on the localization
capabilities of those plates as well as the preparation of numerical models that may
predict those results in a more accurate fashion.