Jesper Hvolbøl Nielsen, Force Technology: Tackling the ROTOR tug simulation challenge


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Jesper Hvolbøl Nielsen, Sales Manager, Division for Maritime Industry, Force Technology, Denmark delivered this presentation at the 2012 International Harbour Masters Congress – Global Port and Marine Operations in Ireland. The Congress provides a unique forum in which formal Association meetings are combined with a conference and an exhibition - displaying equipment, services and technical developments from throughout the port and harbour sector. The event is held biennially and will next take place on 26-30 May 2014 in Bruges – Ghent, Belgium. Addressing the theme, ‘Safe and smooth access to ports: A challenge’, the 9th IHMA Congress in Belgium will showcase technical and operational breakthroughs together with international case studies on the development and management of modern port and marine operations across the globe. For more information about the congress, please visit the event website:

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Jesper Hvolbøl Nielsen, Force Technology: Tackling the ROTOR tug simulation challenge

  1. 1. TACKLING THE ROTOR TUG CHALLENGE Captain Jesper Hvolbøl Nielsen Sales Manager FORCE Technology Division for Maritime Industry
  2. 2. Introduction Tug simulation and hydrodynamics are strategic focus areas for FORCE Technology. Over the past years, we have seen an increased demand for training and detailed studies of waterways and ports where there has been a need for simulation of individual and specific types of tugs. IALA supports this development. Especially simulations targeted at waterway design and placement of Aid to Navigation.
  3. 3. Use of tug simulators Simulators are a great tool for training as well as port studies. Training Due to increasing amount of incidents and near misses the industry has recognised that simulator based training of personnel in general tug handling as well as in specific operations is required. Port Studies Ship simulators offers a very cost effective approach to port studies with different objectives
  4. 4. Training in simulators For training we have seen a requirement for advanced tug simulations, for example: • • • • • Training of tug masters in new tug types Training in escort operations for large tankers Tow out of large new-buildings from ship yards Assistance of LNG carriers to and from terminals positioned offshore Tug assistance in new or modified ports that will be operating large vessels in the future
  5. 5. Port Studies Examples of objectives: • • • • • • • • Placement of navigational aids Evaluation of breakwater layout and alignment Evaluation of arrival/departure conditions for existing or new port facilities Mooring studies Controllability of vessels at limited water depth Risk analysis Operational guidelines Determination of tug type, size and number best suitable for a specific operation
  6. 6. Accurate models required For training and port studies it is important that the mathematical models used are very precise and accurate. Accurate mathematical models is obtained through: • • • • Tank testing and CFD calculations Simulation models developed by Naval Architects Comparison with objective data from specific tug operations Calibration and validation performed by tug masters
  7. 7. Accurate models required In order to further enhance the realism of the mathematical models FORCE Technology continues to enhance the models further, for example: • • • • • Complex ship-ship interaction between the assisted ship and the tugs Tug performance in waves Lee effects Fender interaction Modelling of the towing line
  8. 8. Rotor tug characteristics The Rotor tug concept was developed by the Dutch company Kooren in the late 1990’s and first used to handle large-windage-area car carriers in the Bremerhaven locks. Rotor tug characteristics: • Compared to a conventional ASD tug the Rotor tug does not have a skeg and has two Azimuth thrusters fore and a third Azimuth thruster aft.
  9. 9. Rotor tug characteristics This configuration of propulsion and steering units gives the high-powered Rotor tug extreme manoeuvrability and the ability to work efficiently in narrow spaces. Modelling of the tug for use in our simulators has been a big challenge for our naval architects.
  10. 10. High-end simulators required FORCE Technology has developed a wide range of ship simulators. • • • At our simulator centre in Copenhagen we operate nine ship simulators We perform simulations involving up to 5 coupled simulators, assisted vessel manned by Pilot/Captain and 4 tugs manned by tug masters New simulator centre in Singapore
  11. 11. Case conclusions FORCE Technology performs about 30 port studies per year, 5 of those involves rotor tugs. Through performing a number of studies we have concluded the following for rotor tugs: • • • • versatile and safe in terms of assisting when doing speed Great for indirect towing Reduction in the total amount of tugs Can apply almost full bollard pull when alongside assisted vessel