Assessment on monopile based structures for hydrogen WTG

H2SEA carries out assessment on monopile based structures for hydrogen WTG

To obtain platform mass, dimensions, and rotational inertia, all required systems were selected, listed and an optimised platform layout and mass estimation were made. For the design of the platform support beams, gravitational loads and extreme wind gust loads were taken into account. The selection of the support structure concept was performed using a multi-criteria analysis.

For fatigue assessment, an analytical fully dynamical model was constructed in Maple. The structure was simulated by the equations of motions, including airy wave force, rotor damping, topside and platform mass and rotational inertia, embedded length, and homogeneous soil stiffness. The Maple model was used to simulate dynamic behavior of both structures, determine first and second natural frequency, and present displacements and overturning moments in these two mode shapes. 

Finally, a fatigue damage calculation including 500 combinations of wave height and period is performed, for a 25-year lifetime.

Offshore Wind and Hydrogen