This paper describes an experimental study of the vortex induced vibration of tapered cylinders which is being used for the tower. In the experiment, effects of turbulence, structural damping and taper were investigated. From the investigation, the following results were obtained.
1. The vortex induced vibration occurs for any types of cylinders from a straight cylinder and afull tapered cylinder when the structural damping is small enough both in smooth and turbulent boundary layer flows.
2. The tapered part does not effect so much on the vortex induced vibration when the tapered part is less than a half of the cylinder height, but the onset velocity of the vibration shifts to the higher velocity and the velocity rage of the vibration becomes wider when the tapered part is beyond 3/4 of the height.
3. The response is much larger at the higher wind velocity in the turbulent flow than in the smooth flow when the tapered part is beyond 3/4 of the height.
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