Technical Presentation –– 25 September 2024
Lars Holterud Aarsnes, Head, Maritime Advisory, South East Asia, Pacific and India, DNV Singapore, gave a presentation on Digital Twins via Zoom to a meeting at Navantia Australia in the Aquavista Tower, Docklands, and streamed live on 25 September. The presentation was attended by 7 with a further 15 participating online.
This presentation provided an introduction to digital twins and their role in the maritime industry, with a focus on structural condition monitoring.
Using DNV’s ‘Nerves of Steel’ technology as a framework, Lars explored the four levels of digital twins: Indicator, Numerical Twin, Sensor-based Twin, and Hybrid Twin.
The presentation covered the practical applications of digital twins for naval architects, highlighting how they optimise asset management and enhance safety. He also addressed the process of building and maintaining a digital twin, while discussing the current state and future developments in this field.
The presentation was recorded and is expected to be available soon on the RINA YouTube channel.
The Presenter
Lars Holterud Aarsnes currently heads DNV’s Maritime Advisory for South East Asia, Pacific and India, based in Singapore. Prior to this role, he led the Structures Unit within Maritime Advisory and has served as Global Head of the Structures Practice since 2022. He has been the product owner and lead developer for DNV’s digital twin technology, Nerves of Steel, a cutting-edge solution used for structural condition monitoring of ships and offshore assets. With nine years of experience at DNV, Lars has provided a wide range of technical advisory services, specialising in structural analysis, lifetime extension, programming, and hull condition monitoring. He holds a master’s degree in Marine Technology (Naval Architecture) from NTNU, Norway, with a focus on hydrodynamics and structures.
Technical Presentation –– 28 August 2024
Derek Shields gave a presentation on The Story of Sagan: Building a 36 ft Huon Pine Yacht by Hand in the 1980s Shipping as a webinar (i.e. streamed live only) on 28 August. The presentation was attended by 11 online.
This presentation covered Derek’s building of a 36 ft (11.0 m) Huon Pine yacht from 1983 to 1985 and a highlight of its voyage across the Southern Ocean. These were the days of designing boats by eye. No calculations; dimensions and curves were “a bit tighter or fuller than on this boat or that”. Building was by hand, eye and feel, offering up and trimming, nailing and roving, plaining and sanding.
After deciding that the only way he could afford to go world cruising on his own boat was to build it, Derek spent three years learning and applying the art of building a timber yacht as he constructed Sagan, a beautiful carvel planked, splined, laid-deck cruising yacht. In the subsequent 39 years, Sagan has carried Derek, his family and his friends on many adventures over many thousands of miles, and sails proudly to this day, ready for more adventures.
Derek went into some detail of the design drawings and techniques involved in building a timber boat, with participants gaining an insight into the many thousands of parts which are shaped and hammered and bolted in many ways to complete the construction of a boat as small as 36 ft.
Sagan’s maiden voyage was across Bass Strait, around Australia to Darwin and then Africa via many islands and anchorages, down to Durban and then across the Southern Ocean back to Tasmania. To finish up, Derek showed a selection of photos from his voyage to Amsterdam and the St Paul Islands which are halfway between Durban and Hobart and a long way from everywhere else.
The presentation was not recorded.
The Presenter
Derek Shields grew up on a farm where he learned to build whatever was needed and to fix whatever broke down. He gained a Bachelor of Science in a mixed degree at Flinders University, then worked on a cray boat on Tasmania’s west coast and down the mines at Rosebery to save for a trip around the world. That trip lasted 15 years and morphed into working on oil rigs as a geological engineer in many countries.
His love of the sea, boats and adventure eventually resulted him building his own yacht and sailing with Mary, his wife to-be, for four years around Australia and the southern Indian Ocean. He then settled in Tasmania and ran a geological engineering business for three years. With two friends, he founded a marine biological business to monitor the impacts of salmon farming and conduct environmental impact assessments in Tasmanian coastal waterways. Along the way he built two family homes.
Since retiring he has worked as a volunteer skipper for a marine research organisation, Reef Life Survey, sailing and maintaining ocean-going sailing catamarans throughout the coastal and near-oceanic waters of Australia. A classic jack of all trades, master of none.
Sagan under construction
(Photo courtesy Derek Shields)
Sagan sailing
(Photo courtesy Derek Shields)
