Agradecimentos: The authors would like to acknowledge Stationmar AS, which is the owner of the new platform concept, and its inventor Per Vatne, for providing valuable detailed information and support throughout this study. Also, the authors would like to acknowledge The Research Council of Norway for funding the Brazilian-Norwegian Subsea Operations Consortium through the INTPART programme, which supports the ongoing international cooperation between the Norwegian University of Science and Technology and the University of Campinas. Thanks also go to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/Print). The fourth author would like to thank the National Council for Scientific and Technological Development (CNPq). This work was financially supported by The Research Council of Norway through the Brazilian-Norwegian Subsea Operations Consortium, a collaboration between the Norwegian University of Science and Technology and the University of Campinas Ver menos

Abstract: Investigations regarding the dynamic response of a novel heave-compensated floating platform have been carried out. The concept consists of a semi-submersible floating platform with an air chamber below its hull, aiming to keep the static platform buoyancy constant, thus effectively reducing heave motion and enabling its use under harsh environmental conditions as in the North and Norwegian seas. This work develops a dynamic response model for the concept platform in which hydrodynamic coefficients calculated using potential flow theory and mooring lines effects are considered. Calculations in both the frequency and time domain are performed, and results show that the air chamber and effects of the mooring lines are the most beneficial scenario to reduce the dynamic response, especially in terms of heave motion reduction at lower wave frequencies. Another observed benefit is the change of the heave resonance peak away from the typical observed frequency range of sea waves Ver menos