Vibration and Instability of Rotating Composite Thin-Walled Shafts with Internal Damping

Table 5

Modal dampings of cantilever composite box beam: .

Mode	Damping
	Present			Reference [18]
	First flapping	2.39	2.38		2.38	2.35
Second flapping	—	2.37	2.37	2.35
First sweeping	3.03	2.53	2.53	2.35
Second sweeping	—	2.36	2.36	2.37
First torsional	2.89	2.89	2.89	2.89
Second torsional	2.82	2.92	2.92	2.89