Numerical and Experimental Research on the Effect of Platform Heave Motion on Vortex-Induced Vibration of Deep Sea Top-Tensioned Riser

Table 5

Test conditions.

No.	Current velocity (U)	Pretension (Tt) (N)	Variable tension
			Amplitude (△T)	Frequency (Ω)
1	0.3 m/s	100	0	0
2	0.5 m/s	100	0	0
3	0.3 m/s	100	20 N	1 Hz
4	0.3 m/s	100	20 N	3 Hz
5	0.3 m/s	100	30 N	1.5 Hz
6	0.3 m/s	100	30 N	3 Hz
7	0.5 m/s	100	20 N	1 Hz
8	0.5 m/s	100	20 N	3 Hz
9	0.5 m/s	100	30 N	1.5 Hz
10	0.5 m/s	100	30 N	3 Hz