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Publications
Hallak, T.S., Gaspar, J.F. and Guedes Soares, C. (2025), Numerical modelling of floating wind-wave platforms, Innovations in Renewable Energies Offshore, Guedes Soares, C. & Wang S. (Ed.), Taylor and Francis Group, London, UK, 815-824.
A multi-degrees of freedom time domain model is established to investigate the dynamic response of floating constrained multi-body systems, herein applied to the case study of a hybrid wind-wave platform consisting of a 10 MW semi-submersible Floating Offshore Wind Turbine and a hinged point-absorber Wave Energy Converter. The point-absorber is connected to the platform by a means of articulated mechanism and a hydraulic Power Take-Off system. The great number of degrees of freedom and great level of complexity are represented by a robust dynamic model that uses generalized coordinates to suit the nonlinear nature of geo-metric constraints with precise account of mechanical and hydrodynamic interactions as well as the geometri-cally constrained coupled motion. A verified hydrodynamic post-processing code is then extended to suit the multi-degrees of freedom formulation, as a result, it performs time domain simulations using convolution inte-grals to account for the memory effects of the free surface. The time domain model is herein demonstrated, by comparing frequency domain multi-body response with time domain motion response. The results show that the novel time domain model is, indeed, suitable for the simulation of complex in-nature constrained floating multi-body systems, such as hybrid Floating Wind-Wave Platforms.
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