Iterative Homotopy Harmonic Balance Approach for Determining the Periodic Solution of a Strongly Nonlinear Oscillator

Table 3

Comparison of approximate periods with the exact period for Case 3.

	(RE)	(RE)
0.01	1.24079 (0.10731)	1.23909 (0.02985)	1.23946
0.1	2.49977 (0.08246)	2.49714 (0.02282)	2.49771
1	4.28454 (0.03385)	4.28271 (0.00887)	4.28309
10	5.62191 (0.00481)	5.62157 (0.00125)	5.62164
100	6.12075 (0.00033)	6.12072 (0.00016)	6.12073
1000	6.24708 (0.00016)	6.24707 (0.00000)	6.24707