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DLBA COMMERCIAL NEWS

DLBA and the Wind Market
SATV Concept

SEPTEMBER 13, 2021

The DLBA team has been hard at work researching the feasibility of a monohull crew transfer vessel (CTV) for the U.S. Offshore wind farm industry. Rather than maintain the status quo with a European catamaran design, DLBA saw the opportunity to design a vessel tailored to the environmental and economic conditions present in the northeastern U.S. The geographic location of U.S. wind farms is much farther from shore, which will require increased vessel endurance and berthing requirements to be economical for vessel operators.  DLBA’s research efforts have been focused on three key areas, including meeting or exceeding the requirements for current U.S. CTV solicitations, developing a preliminary design technical data package to allow shipyards to quickly cost the vessel, and investigating hybrid and electric propulsion options.

In order to determine if the DLBA-designed vessel met the key seakeeping and crew transfer requirements, a multibody OrcaFlex analysis was performed to determine the interaction our vessel would have when transferring personnel to the wind turbine structures. This required investigation into the friction and damping provided by specialized fendering, the impact of a vessel gyrostabilizer, thrust reduction due to propeller exposure, and wave period probabilities in the northeastern U.S. 

The modeled crew transfer seakeeping performance of the DLBA CTV is very promising, with ability to perform in seas exceeding two (2) meters in probable wave periods. Typically, CTV solicitations only require 1.5 to 1.75 meter transfer capability. With some additional hull shape refinement and continued engagement with industry on alternative propulsion, DLBA should have an exciting new CTV design that can be used in the U.S. Offshore Wind environment.

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