Determination of the Fundamental Frequency of Perforated Rectangular Plates: Concentrated Negative Mass Approach for the Perforation

Table 1

Specimen parameters.

Specimen no.	𝑎 (mm)	𝑏 (mm)	ℎ (mm)	𝑑 (mm)	(𝐴/𝐴𝑝)
1	138	216	2	5	1518.154
2	138	216	2	10	379.5384
3	138	216	2	15	168.6837
4	138	216	2	25	60.72615
5	138	216	2	30	42.17094
6	276	432	2	10	1518.154
7	276	432	2	20	379.5384
8	276	432	2	25	242.9046
9	276	432	2	50	60.72615
10	276	432	2	65	35.93263