This dissertation contains new results on the design of dynamic positioning (DP) systems for marine surface vessels. A positioned ship is continuously exposed to environmental disturbances, and the objective of the DP system is to maintain the desired position and heading by applying adequate propeller thrust. The disturbances can be categorized into three classes. First, there are stationary f...

• Maximum speed in a seaway: 'involuntary' speed reduction due to added resistance in waves and 'voluntary' speed reduction to avoid excessive motions, loads etc. • Route optimization (routing) to minimize, e.g., transport time, fuel consumption, or total cost. • Structural design of the ship with respect to loads in seaways. • Habitation comfort and safety of people on board: motion sickness, ...

Floating offshore structures, particularly floating oil production, storage and offloading systems (FPSOs) are still in great demand, both in small and large reservoirs, for deployment in deep water. The prediction of such vessels’ responses to her environmental loading over her lifetime is now often undertaken using response-based design methodology, although the approach is still in its...

This paper describes the validation of a novel method to simulate current loading on floating offshore wind turbine model. A dynamic winch actuator is used emulate drag force platform model with Software in Loop application. Current loads are combined wave- and loads. The results experiments physical validated against simulated current. wave-current interactions also described. show that can re...