Comparative study of utilizing a new type V-Shaped Tuned Liquid Column Damper and U- Shaped Tuned Liquid Column Damper in floating wind turbines

摘要

While utilizing TLCD (Tuned Liquid Column Damper), severe excitation circumstances may lead to empty one of the vertical sections and make the liquid column to lose its U-Shape which results in dramatic changes in mathematical formulation and physical behavior of the liquid column. In this work, the response of a floating wind turbine with a barge type support controlled by a new type V-Shaped Tuned Liquid Column Damper subjected to couple hydrodynamic and aerodynamic loads is investigated through using a modified version of the aero-elastic code FAST (Fatigue, Aerodynamics, Structures and Turbulence). A sequential method is applied to solve the multi degree of freedom floating wind turbine couple with a single degree of freedom V-Shaped Tuned Liquid Column Damper. Through this method, the nonlinear equation of motion of the damper is incorporated in a modified version of FAST while V-Shaped Tuned Liquid Column Damper damping force due to the fore-aft tower top acceleration on turbine's tower is calculated in each time step. The results are compared to the floating wind turbine system with TLCD (Tuned Liquid Column Damper) as well as the baseline system. It is shown that utilizing V-Shaped Tuned Liquid Column Damper in comparison to U-Shaped one result in more reliable structural response specifically under severe wind conditions in floating wind turbine systems.