Dynamic Property Investigation of Sandwich Acoustic Black Hole Beam with Clamped-Free Boundary Condition

Table 2

Comparison of the first 30 natural frequencies obtained by the present model and FEM.

Natural frequency	Present model	FEM	Error (%)
ω1	121.65	121.74	−0.070
ω2	142.21	142.56	−0.247
ω3	751.74	748.92	0.376
ω4	869.24	865.82	0.392
ω5	1765.8	1767.2	−0.078
ω6	2050.4	2044.6	0.286
ω7	2331.9	2321.5	0.447
ω8	3493.5	3469.3	0.408
ω9	3895.3	3875.3	0.515
ω10	4298.9	4301.5	−0.060
…	…	…	…
ω21	13285	13216	0.521
ω22	14816	14723	0.634
ω23	16024	15922	0.640
ω24	16016	15929	0.544
ω25	17386	17295	0.528
ω26	17936	17837	0.554
ω27	19141	19019	0.639
ω28	19131	19352	−1.143
ω29	21105	21023	0.390
ω30	21224	21118	0.501