Natural Frequencies and Mode Shapes of Drill Pipe in Subsea Xmas Tree Installation

Table 3

Experimental conditions.

	The diameter D (mm)	Pipe length L (mm)	The lumped mass: m (g)
			0	103	206	309	412	515
Model 1	10	900	Exp1	Exp2	Exp3	Exp4	Exp5	Exp6
Model 2	10	1500	Exp7	Exp8	Exp9	Exp10	Exp11	Exp12
	The diameter D (mm)	Pipe length L (mm)	The lumped mass: m (g)
			0	1155	2097	3032	3972	4912
Model 3	40	900	Exp13	Exp14	Exp15	Exp16	Exp17	Exp18
Model 4	40	1500	Exp19	Exp20	Exp21	Exp22	Exp23	Exp24