Introduce the participant to offshore wind energy and the engineering methods specific to this field of wind energy. En studerende, der fuldt ud har opfyldt kursets mål, vil kunne:

• Describe the main elements of offshore wind turbine systems and the differences to land based turbines.
• Be familiar with the offshore turbine design standard IEC 61400-3.
• Calculate a force time series from linear irregular waves.
• Derive simplistic rotor load time series from wind inflow and wind turbine parameters.
• Explain the basics of wake effects inside offshore wind farms.
• Describe the typical foundation types for bottom-fixed offshore wind turbines and decide on foundation types (floating, jacket, monopile).
• Explain the basic dynamics of bottom fixed offshore wind turbines and the method for fatigue calculations.
• Apply the elements of a design basis together with simplified models for conceptual design of a substructure.
• Determine the natural frequency for an offshore wind turbine support structure using approximate formulas.
• Comprehend the economics of levelized cost of energy.

Offshore wind turbines and wind farms. Overview of offshore design codes (e.g. IEC 61400-3 and DNV OS J101). Calculation of wave loads in linear regular and irregular waves by the Morison equation. Engineering methods for computation of rotor loads. Offshore environmental conditions - design basis. Wakes. Substructure types (monopile, jacket, gravity based) and their relative strengths. Design methods for monopiles. Floating wind turbines (technology, modelling etc.) Soil models. Cost of offshore wind energy. Course slides, relevant design standards and selected papers/reports. Specific chapters of text books will also be referred to. The reports are made in groups of two participants. The groups present the progress of their report in the online Q&A session a couple of times during the semester. A plan for this is made at the start of the course. 29. april, 2019