In an offshore wind farm, the turbines are connected to a transformer by cable routes which cannot cross each other. Finding the minimum cost array cable layout thus amounts to a vehicle routing problem with the additional constraints that the routes must be embedded in the plane. For this problem, both exact and heuristic methods are of interest. We optimize cable layouts for real-world offsho...

This paper summarises fatigue tests on Y-joints to estimate the influence of a post weld treatment method called Ultrasonic Impact Treatment. With this method the fatigue resistance could be increased significantly. Furthermore, tubular joints of tripod structures for offshore wind energy converters are analysed with numerical simulations to judge these welded joints with the hot-spot-concept. ...

As offshore wind energy development is planned in the United States, there is an increasing need for preand post-construction monitoring plans to be focused on species determined to be most vulnerable to hazards of a speci c project. We propose a conceptual model that incorporates biological and sociological parameters. Speci cally, we suggest that demographic, ethological/biological, and popul...

In the next decennia, upscaling even towards 10 MW wind turbines may be necessary to lower the costs of offshore wind energy. This requires considerable reductions of turbine loads. Variable speed turbines with active pitch control are most favorable and prevailing nowadays. Currently, the turbine blades are turned collectively to limit the excess of wind power and to regulate the rotor speed a...

The Bora wind field is characterised by strong vorticity and divergence. Several numerical experiments, in which an oceanographic model was forced with northeasterly winds having climatological alongshore variability, were performed in order to study the influence of spatial variability in the bora wind field on the surface currents in the northern Adriatic. Numerical model results showed that ...