Abstract
Abstract A multi-purpose platform (MPP) is an offshore system designed to serve the purposes of more than one offshore industry. Indeed, over the past decades, a number of industries have expanded, or are expanding, from onshore to offshore locations (renewables, aquaculture, tourism, mineral extractions, etc.), and the research on these type of platform is increasing. In the present work, a MPP able to accommodate wind turbines, wave energy converters, and aquaculture systems are considered. This work presents the first part (Part A) of the analyses of the dynamics of the floating support structure for this MPP, focusing on the rigid body dynamic response, while its complementary hydroelastic analysis is presented in Part B (OMAE2019-96282). The aim here is to assess the dynamic response of the platform with respect to the preliminary requirements imposed by the wind turbine, the aquaculture system, and the other ancillary systems. After describing the platform analyzed, and explaining the aero-hydro coupled model of dynamics approach adopted, two independent analyses are conducted, one using the SESAM package by DNV-GL, and another using ANSYS AQWA, in order to verify the results, in absence of experimental data. Considering a severe, but still operational, load case, the preliminary results seem to demonstrate that the chosen platform can satisfy the dynamics constraints imposed by the payload systems.
Highlights
The “blue growth” economy, already in 2012, represented 5.4 million jobs in Europe, generating a gross added value of 500 billion euros/year [1]
Hu et al [3] simulated the dynamic responses of a floating wind turbine under operation and fault condition
The present work focuses on the development of the aerohydro coupled model for the dynamics of the multi-purpose platform, and the assessment of its dynamic response under the joint excitations of offshore wind and ocean waves
Summary
The “blue growth” economy, already in 2012, represented 5.4 million jobs in Europe, generating a gross added value of 500 billion euros/year [1]. The ‘Blue Growth Farm’ project has been started to provide a universal solution to the full exploitation of ocean resource, by proposing a multi-purpose offshore platform This platform aims to integrate wind and wave energy devices (renewable energy generation), an aquaculture system (produce fish at industrial level), a maritime surveillance unit (provide meteorological and oceanographic data) and a docking system (accommodate specialized vessels). The present work focuses on the development of the aerohydro coupled model for the dynamics of the multi-purpose platform, and the assessment of its dynamic response under the joint excitations of offshore wind and ocean waves. The application of potential flow theory inherently implies that any viscous effect is ignored, and the dynamic responses predicted are conservative It is one of the limitations in the present numerical modeling. The blade-pitch controller is to regulate the generator power above the rated operation point
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