A New Radial Spoiler for Suppressing Vortex-Induced Vibration of a Tubular Tower and Its Practical Design Method

Table 2

Factors and levels.

Level	Factors
	1	0.2	1	5
2	0.65	1.5	7.5
3	1.1	2	10
4	1.55	2.5	12.5
5	2	3	15