Structural dynamic response of offshore wind turbine support system

摘要

The vibration safety of offshore wind turbine support system is a key problem of project construction, and structural dynamic response is an important basis for its evaluation. In this paper, tidal hydrodynamic characteristics of foundation with 8 piles are studied through physical model. Combining with the simulation of wind and mechanical vibration, structural dynamic response characteristics of offshore wind turbine support system are studied by finite element method. Results show that main energy of tidal hydrodynamic flucuating pressure concentrates within 10Hz and main frequency is between 0.1∼1.5Hz. Strouhal number representing vortex shedding frequency of slab is about 0.2 and pile is 0.03. With combination effect of tide, wind, electromechanical load, the maximum displacement of support system appears on top of the tower, mainly caused by low-frequency dynamic forces such as tidal current, wind vortex shedding. Influence of mechanical vibration is relatively small.