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Session 32 Olle Rutgersson

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  • 1. Chalmers University of Technology Multidisciplinary research – a necessity in the development of future class rules Professor Olle Rutgersson and Associate Professor Jonas Ringsberg Department of Shipping and Marine Technology Chalmers University of TechnologyDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 1
  • 2. Chalmers University of Technology Outline • Introduction • The Safecoll project – innovative design • The Hasard project – a holistic model for damage stability assessment • Concluding remarksDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 2
  • 3. Chalmers University of Technology Research and education Competence areas Maritime law Environment Economics Operation & safety Logistics & cargo Human factors Structural Systems Hydromechanics engineering engineering Education programsDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 3
  • 4. Chalmers University of Technology Organisation and personnel Head of Department Olle Rutgersson Vice Head of Department Administration Maritime Waypoint Lars Larsson Birgitta Oscár Lars-Eric Carlsson Deputy Head of Department Eva Jacobsson • Market of Shipping Research Coordinator • External Courses Björn Södahl • Full-mission Bridge Simulator Division of Ship Design Division of Ship Work Division of Shipping Division of Sustainable Head of division: Environment and Safety Logistics and Chartering Ship Propulsion Jonas Ringsberg Head of division: Head of division: Head of division: Margareta Lützhöft Anneli Rask Lars Larsson • Marine Structures • Marine Transport Systems • Human Factors • Hydromechanics • Seakeeping • Maritime Safety • Marine Environmental • Navigation and Communication Technology • Marine Machinery SystemsDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 4
  • 5. Chalmers University of Technology Introduction • The Safecoll project – An investigation of maritime safety when collision between two ships occurs. – Development of a new “innovative” side-shell structure which allows for large intrusion depth before leakage occurs. • The Hasard project – Development of tools and models using a holistic approach. – A joint project between the disciplines of marine structures and seakeeping.Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 5
  • 6. Chalmers University of Technology The Safecoll project • Safecoll: – Safety against collisions by means of innovative side shell designs. – Project leader: Professor Anders Ulfvarson. • Project aims: – To achieve improved collision safety for collisions that take place in the side of the struck ship (focus on RoPax ships). – The mass of the new (proposed) structural design should be maintained or reduced in comparison with existing conventional structural designs. • The Safecoll project was funded by: – VINNOVA, – The Swedish Mercantile Marine Foundation and – The Swedish Maritime Administration.Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 6
  • 7. Chalmers University of Technology Requirements on the new side-shell design • Stakeholders’ interests must be fulfilled (the shipowners, the classification societies and maritime authorities, the shipyards, insurance companies and the cargo owners) • A 100% increase of the energy absorption capability of the side- shell structure. • A cost increase of a maximum of 1.5% of the ship’s total cost. • A weight increase of a maximum of 1.5% of the ship’s total lightweight. • An unchanged cargo and ballast volume. • Normal structural strength according to the rules. • Access for inspection and maintenance. • Not a “too complicated” design to construct.Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 7
  • 8. Chalmers University of Technology Deformable inner side-shell against collision damage Ship-to-ship collision Collision damage caused by a bulbous bow colliding into the side of a shipDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 8
  • 9. Chalmers University of Technology The reference vessel “Intermodeship” and the midship section used in the FE-simulations Length overall: 88 m Waterline Bredth molded: 13.3 m Design draught: 4 m 10.75 m Deformable inner side-shell 16.80 m Schematic illustration of the The reference vessel “Intermodeship” and the deformable inner side-shell midship section used in the FE-simulationsDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 9
  • 10. Chalmers University of Technology The “steel sheet test” Nonlinear explicit FEA of the test 1,6 Test 240_1 Test 240_2 1,4 Test 355_1 Test 355_2 Test 700 1,2 Mtrl 240, Shear failure 45% Mtrl 355, Shear failure 45% 1 Mtrl 700, Shear failure 39% Force [MN] 0,8 0,6 0,4 0,2 0 0 0,05 0,1 0,15 0,2 0,25 0,3 Indenter displacement [m]Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 10
  • 11. Chalmers University of Technology Experiments and nonlinear explicit FEA of a scaled ship structure Penetration of the Penetration of the upper plate. lower plate. Test FEM Test FEM 1 Test structure 1 0,9 Test structure 2 0,8 Mesh 15mm, failure strain 39% 0,7 Force [MN] 0,6 0,5 0,4 0,3 0,2 0,1 0 0 0,1 0,2 0,3 0,4 0,5 Indenter displacement [m] Test FEM T-beam off.Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 11
  • 12. Chalmers University of Technology Comparison of nonlinear explicit FEA between afull-scale (conventional) ship structure and a new design Main deck 5 4 3 4800 mm Tanktop 2 1 A B B/5 Waterline Waterline at design at design draught draught Reference Conceptual design design 6675 mm 6675 mm CL CL 6675 mm CL Reference design Conceptual designDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 12
  • 13. Chalmers University of Technology The Hasard project • Hasard: – Holistic assessment of ship survivability and risk after damage. – Project leader: Associate Professor Jonas Ringsberg. • Project aims: – To outline a comprehensive calculation procedure which quantitatively can be used for study of ship’s survivability caused by collision damage, incorporating: • structural collision resistance, • structural stability and collapse, and • ship flooding and stability in waves. • The Hasard project is funded by: – VINNOVA and – Lighthouse.Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 13
  • 14. Chalmers University of Technology HASARD/ HASARD/ Damage patterns on HASARD/ HASARD/ the hull for various MARINE STRUCTURES MARINE STRUCTURES collision scenarios SEAKEEPING SEAKEEPING Global loads FEA SIMCAP Updated ship stability Local loads conditions and loads acting on the structure Risk analysisDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 14
  • 15. Chalmers University of Technology MARINE STRUCTURES: Methodology for the development and validation of numerical models Uniaxial tensile test (FEA and experiments) FLD + biaxial tests (FEA and experiments) Ship structure in small scale (FEA och experiments) Large (global) ship structures (Prediction/study by FEA, study of known accidents)Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 15
  • 16. Chalmers University of Technology Example of a damage pattern used as input to the SIMCAP codeDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 16
  • 17. Chalmers University of Technology SEAKEEPING: Damage stability calculations using the SIMCAP computation code MV Estonia Water on deck! DESSODepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 17
  • 18. Chalmers University of Technology Holistic approach – marine structures and seakeeping • A procedure has been developed to transfer the geometry of arbitrary side-shell damage from a finite element analysis to the SIMCAP code. • SIMCAP can be used for the analysis of arbitrary wave directions. – Progressive flooding is under implementation. • The approach has to some extent been validated against available experimental model tests (Estonia research project). • A number of serious collision scenarios for different ships in calm sea and harsh weather with waves and wind effects is studied. – Study sensitivity for structural design modifications. • Risk analysis: – Work has started and will be completed during 2009.Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 18
  • 19. Chalmers University of Technology Influence from location and size of damage L (1:1) 39.25 m2 Size of damage: M (1:2) 9.81 m2 S (1:4) 2.45 m2 Resolution of MD 157 pts damage in the HD 571 pts model: LD 1 pts Sub KL+3 m Location of damage: WL KL+5 m Above KL+6 mDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 19
  • 20. Chalmers University of Technology Simulation of flooding (the Estonia research project) Flooding through a rectangular hole (bow ramp opening) with different headings and speeds (example study)Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 20
  • 21. Chalmers University of Technology 15knot head seas 90 80 70 response [m],[degrees],[m3/100] 60 Speed 50 15 knots 40 30 variation 20 10 0 -10 0 100 200 10 knot 300 seas 400 head 500 600 90 time [s] 80 70 response [m],[degrees],[m3/100] 60 50 10 knots 40 30 20 10 0 5 knot head seas -10 90 0 100 200 300 400 500 600 time [s] 80 70 response [m],[degrees],[m3/100] 60 50 5 knots 40 30 20 10 0 -10 0 100 200 300 400 500 600 time [s]Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 21
  • 22. Chalmers University of Technology 15knot head seas 15 knot 15 deg SB seas 90 90 80 80 70 70 response [m],[degrees],[m3/100] response [m],[degrees],[m3/100] 60 60 Heading 50 40 50 40 30 30 variation 20 10 20 10 0 0 -10 -10 0 100 200 300 400 500 600 0 100 200 300 400 500 600 time [s] time [s] 15 knot 30 deg SB seas 15 knot 45 deg SB seas 90 90 80 80 70 70 response [m],[degrees],[m3/100] response [m],[degrees],[m3/100] 60 60 50 50 40 40 30 30 20 20 10 10 0 0 -10 -10 0 100 200 300 400 500 600 0 100 200 300 400 500 600 time [s] time [s]Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 22
  • 23. Chalmers University of Technology Example of presentation of results Time to flood 5000 tonnes on car deck 450 400 350 300 head seas time [s] 250 15 deg SB seas 200 30 deg SB seas 150 45 deg SB seas 100 50 0 0 5 10 15 20 vessel speed [knots]Department of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 23
  • 24. Chalmers University of Technology Concluding remarks … • Development of future class rules requires multidisciplinary research activities between – academia and industry, and – different research groups and universities. • Holistic models may serve as virtual tools/laboratories which can assist in rule making by empirical analysis and probability-based design. • More information about the Hasard and Safecoll projects: http://www.chalmers.se/smt/EN/researchDepartment of Shipping and Marine Technology JW Ringsberg and O RutgerssonTransportforum in Linköping, January 8-9, 2009 Page 24
  • 25. Founder LIGHTHOUSE MARITIME COMPETENCE CENTRE Thank you!