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- Numerical and experimental analysis of a hybrid wind-wave offshore floating platform’s hullPublication . Hallak, Thiago S.; Gaspar, José F.; Kamarlouei, Mojtaba; Calvário, Miguel; Gonçalves Cavaco Mendes, Mário José; Thiebaut, Florent; Guedes Soares, CarlosThis paper presents a study regarding a novel hybrid concept for both wind and wave energy offshore. The concept resembles a semi-submersible wind platform with a larger number of columns. Wave Energy Devices such as point absorbers are to be displayed around the unit, capturing wave energy while heaving and also enhancing the stability of the platform. In this paper, a first numerical study of the platform’s hull, without Wave Energy Converters, is carried out. Experiments in wave basin regarding the same unit have been conducted and the results are presented and compared to the numerical ones. Both stability and seakeeping performances are assessed and compared.
- Review on hardware-in-the-loop simulation of wave energy convertersPublication . Gaspar, J. F.; Pinheiro, R. F.; Kamarlouei, M.; Guedes Soares, Carlos; Gonçalves Cavaco Mendes, Mário JoséThis paper presents a review of the state-of-the-art of the Hardware-In-The-Loop (HIL) technique applied to the development of wave energy converters (WEC) and power take-off systems (PTO). The presentation discusses existing frameworks and the technologies involved. In addition, a case study is discussed in order to exemplify the HIL concept applied to a WEC-PTO.
- Hardware-in-the-loop testing framework for active accumulator wave energy convertersPublication . Guedes Soares, Carlos; Gonçalves Cavaco Mendes, Mário José; Gaspar, José; Zeng, ChenThe hardware-in-the-loop technique is a hybrid co-simulation approach that joins real physical and virtual components. The real components may be the power take-off while the virtual ones the numerical models of sea wave and wave energy converter hydrodynamics. This simulation approach has been published with some regularity, however a review of the state-of-the-art has not been found, in particular in the research field dedicated to wave energy converters. Thus, the objective of this paper is to provide the ongoing results of such review, such as the generic testing framework and taxonomy, and their articulation on the simulation of a new oil-hydraulic power take-off concept. In this new concept, different power take-off nominal pressures may be regulated according to different sea states, by changing the hydraulic accumulator charging characteristics. Therefore, this active accumulator is intended to allow an increase on the range of possible Power Take-Off damping forces, thus, better wave energy harvesting performance. The paper results are also intended to support novice and advanced researchers to design simulation approaches in a clear and appropriate manner.