Experimental studies on the vibration of perforated sheet

In the experiment we have measured the resonant frequencies of perforated sheets with perforation rates from 0.008 to 0.30. After comparing those frequencies with the corresponding resonant frequencies of un-perforated one, we obtained an empirical relation between the resonant frequency and pertoration rate of perforated sheet which can be used for industrial purpose. We have also studied the change of vibration energy distribution of perforated sheet.