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

Table 4

Modal dampings of cantilever composite box beam: .

Mode	Damping
	Present			Reference [18]
	First flapping	0.64	0.65		0.65	0.65
Second flapping	—	0.69	0.69	0.67
First sweeping	0.68	0.68	0.68	0.68
Second sweeping	—	0.85	0.85	0.9
First torsional	2.89	2.89	2.89	2.89
Second torsional	2.33	2.92	2.92	2.89