Free Vibration Analysis of DWCNTs Using CDM and Rayleigh-Schmidt Based on Nonlocal Euler-Bernoulli Beam Theory

Table 10

Numerical comparison among [15, 31] CDM and DQM and the first three free frequencies of vibrations of DWCNTs are reported (for 𝜂=0).

𝐿	Mode	[31]	[15]	CDM	DQM
14	𝜔1	0.9097	1.05	1.0298	1.0299
	𝜔2	2.3601	2.84	2.7895	2.7896
	𝜔3	4.1481	5.18	5.1043	5.1045
18	𝜔1	0.5751	0.64	0.6276	0.6276
	𝜔2	1.4648	1.75	1.7202	1.7203
	𝜔3	2.6153	3.36	3.3036	3.3039
24	𝜔1	0.3340	0.36	0.3550	0.3549
	𝜔2	0.8390	1.00	0.9770	0.9767
	𝜔3	1.5162	1.94	1.9046	1.9046
28	𝜔1	0.2482	0.27	0.2614	0.2612
	𝜔2	0.6203	0.73	0.7200	7.1905
	𝜔3	1.1261	1.43	1.4074	1.4066