Periodic Responses of a Rotating Hub-Beam System with a Tip Mass under Gravity Loads by the Incremental Harmonic Balance Method

Table 1

Comparison of the first three dimensionless natural frequencies of the rotating hub-beam system with a tip mass in [14] for and .

First natural frequency			Second natural frequency		Third natural frequency
	Reference [14]	Slope angle; model ()	Reference [14]	Slope angle; model ()	Reference [14]	Slope angle; model ()
0	3.516	3.517	22.035	22.082	61.697	62.289
1	1.557	1.557	16.250	16.277	50.896	51.179
2	1.158	1.158	15.861	15.887	50.448	50.722
3	0.963	0.963	15.720	15.746	50.291	50.561
4	0.842	0.842	15.647	15.673	50.211	50.478