TMD’s control effect on the nonlinear dynamic response of a barge FWOT

Resumo

The use of wind turbine is increasing all over the world. Floating support-platform configurations, such
barge, are used at deep water conditions. The barge configuration achieves basic static stability in pitch and roll
using a large waterplane area and shallow draft. Such structures can exhibit large displacements when vibrating
which demands a nonlinear dynamic analysis. Passive structural control, such a tuned mass damper could be used
in order to keep the structure stability. The main goal of this work is to investigate the effects of a tuned mass
damper (TMD) upon the nonlinear oscillation of a barge-type floating offshore turbine. The analysis uses the
nonlinear normal modes to obtain reduced order models of the system. The reduced order model results are
compared to the numerical integration of the equations of motion and a good agreement between both results is
found. The analytical obtained method is used to investigate important nonlinear phenomena such jumping and
multiple coexisting solutions. A parametric TMD damping and mass ratio is performed in order to obtain their
optimized values.