Parametric excitation suppression in a floating cylinder via dynamic vibration absorbers: a comparative analysis

Abstract Parametric excitation in the pitch/roll degrees of freedom (DoFs) can induce dynamic instability floating cylinder-type structures such as spar buoys, offshore wind or wave energy converters. At certain frequency and amplitude ranges input waves, parametric coupling between heave DoFs results undesirable large rotational motion. One possible remedy to mitigate existence resonance is use vibration absorbers. Two prominent types absorbers are tuned mass dampers (TMDs) nonlinear sinks (NESs), which have contrasting properties with regard their dependencies when absorbing kinetic from oscillating bodies. This paper investigates suppression bodies utilizing absorbers, comparing performance TMDs against NESs for a test case considering vertical cylinder. In addition type absorber utilized, also examines DoF it acts on, benefits attaching primary (heave) secondary (pitch) DoF. The show that TMD outperforms NES more effective attach eliminating pitch