A Unified Approach of Free Vibration Analysis for Stiffened Cylindrical Shell with General Boundary Conditions

Table 1

Comparison of natural frequencies of stiffened cylindrical shells with free boundaries.

Truncated	Modes								Time consuming, s
	n=1	n=2	n=3	n=4	n=5	n=6	n=7	n=8
M=5	1290.34	1661.19	2298.11	3612.72	3693.16	4455.88	4472.75	4756.00	0.26357
M=7	1261.44	1645.61	2252.24	3578.23	3587.75	4454.88	4460.87	4715.33	0.34305
M=9	1244.95	1635.48	2226.08	3533.22	3560.78	4453.71	4453.94	4692.21	0.37890
M=11	1235.15	1628.70	2209.30	3500.31	3550.77	4448.73	4453.12	4676.70	0.39036
M=13	1225.68	1621.08	2189.77	3465.19	3540.46	4443.05	4451.44	4658.80	0.41890
M=15	1225.44	1620.93	2189.49	3465.14	3540.21	4442.22	4451.90	4657.96	0.45036