ABB Dynafin™ has been making waves across the maritime industry, collecting awards1 as well as independent validation and groundbreaking efficiency results in comprehensive model basin tests2. However, the Approval in Principle (AiP) from leading classification society DNV is more than just one more validation of the innovative propulsion concept.
An Approval in Principle (AiP) is an independent evaluation of a concept based on a predefined framework of requirements. It confirms the feasibility of the design and ensures there are no significant technical obstacles hindering its implementation.
ABB Dynafin™ has been designed to use an electric motor to drive a horizontal wheel at the vessel’s stern which is mounted with vertical blades. This results in a combined motion that mimics the movement of a whale’s tail, establishing new levels of propulsive efficiency. With each blade adjusting its angle powered by its own dedicated high-torque, permanent-magnet motor and control unit, thrust and directional control happen at the same time without the need for mechanical gearboxes.
“We are pleased to grant AiP for ABB Dynafin™, based on our assessment of the entire propulsion concept, including its electrical and control systems”, said Øystein Åsheim Alnes, Head of Section, Propulsion & Steering, DNV Maritime. “DNV verifies that the solution aligns with the intent of our rules and applicable industry standards and has a viable path to move forward.”
An early study modelling performance of the solution aboard a passenger vessel predicted ABB Dynafin™ would consume 22 percent less energy compared to a conventional shaftline configuration. Subsequent trials by researchers at MARIN earlier this year verified open-water efficiencies above 80 percent, pointing to substantial gains for owners as they seek to cut fuel consumption and outpace greenhouse gas emissions targets for 2030 and beyond.
Applied to vessel design, AiP from class is relevant to enable development work across a range of craft for which ABB Dynafin™ units in the range of 2 – 4MW are suited. This includes for example Ro-Ro ships, ferries, offshore support vessels and other special purpose vessels, which are designed for unique operations like scientific exploration or laying underwater cables. The all-electric propulsion system is also highly adaptable for use with zero-emission battery and fuel cell technologies. As well as high maneuverability and positioning performance, i.e., the capacity of the vessel to maintain the desired position and heading, vessels featuring ABB Dynafin™ would benefit from lower noise and vibrations.
“Receiving AiP from DNV is a significant milestone for ABB Dynafin™ and a strong validation of our commitment to pioneering sustainable marine propulsion technologies”, said Janne Pohjalainen, Global Product Line Manager ABB Dynafin™, ABB’s Marine & Ports division. “This achievement reflects the dedication of our team and the strength of our collaboration with DNV.
With ABB Dynafin™, we are not only introducing a new propulsion concept; we are helping to shape the future of energy-efficient, low-emission shipping.”
References
[1] https://new.abb.com/news/detail/119452/abb-dynafin-wins-retina-eco-award-for-environmental-sustainability-and-innovation
[2] https://new.abb.com/news/detail/124790/marin-tests-verify-groundbreaking-efficiency-of-abb-dynafin-propulsion
