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Sigma Energy

Sigma Energy developed and implemented an original mechanical PTO system, with inertial unidirectional clutches which smooth the rotation of the generator and increase its efficiency.

Sigma Energy also developed an original circular float design with an open bottom and system of unidirectional valves. It captures pre-calculated mass of water, which makes the float properly weighted and (in case of extreme waves) it highly reduces the bottom slamming loads. Float is connected to the spar by specially constructed and patented spherical joint. The joint enables the float to pitch, which highly reduces the dynamic loads on (very exposed and tensed) vertical spar. It also makes the float motion considerably smoother, with reduced danger of bottom slamming.

The spar is supported by a tension leg platform with three tendons of equal length, so it remains vertical throughout the motion. This, as proved by model tests, enables very favourable and effective heave motion of the float. There is an original, patented, procedure for deployment of the tension leg platform and the float at the chosen location. Most of the presented innovative solutions have been tested and verified by numerical analysis and several model tests.

http://www.sigma-energy.si/
Country:
Slovenia

Marine Energy Documents Related to Sigma Energy

Tethys Engineering is a knowledge hub that contains documents and resources about the technical aspects of marine energy development. The table below contains all of the documents in the Tethys Engineering Knowledge Base associated with Sigma Energy.

Total: 6

Title Author Date Type of Content Technology Collection Method Engineering
Sea trials of Sigma wave energy converter – slacking and snapping of TLP mooring lines Miškov, V., Dragić, M., Tomin, V. Journal Article Wave, Point Absorber Field Data Mooring
Sea trials of Sigma wave energy converter – Power and efficiency Dragić, M., Hofman, M., Tomin, V. Journal Article Wave, Point Absorber Field Data, Scale Device Performance, Power Take Off
Validation of a CFD model for wave energy system dynamics in extreme waves Katsidoniotaki, E., Shahroozi, Z., Eskilsson, C. Journal Article Wave, Point Absorber Modeling, Scale Device Performance
On End-Stops and Snap Loads for Taut-Moored Wave Energy Converters Palm, J., Eskilsson, C. Conference Paper Wave Hydrodynamics, Mooring, Power Take Off
Facilitating Large-Amplitude Motions of Wave Energy Converters in OpenFOAM by a Modified Mesh Morphing Approach Palm, J., Eskilsson, C. Conference Paper Wave Modeling Hydrodynamics, Performance, Structural
Model tests of Sigma wave energy converter: The lessons learned Dragić, M., Hofman, M., Tomin, V. Journal Article Wave, Point Absorber Modeling, Test Center, Scale Device Performance, Power Take Off
Displaying 1 - 6 of 6 results