Ship motion in waves   prediction of dynamic stability

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TUMST. Ship Manoeuvrability - Theory and Assessment-. 2. . IMO (International Maritime Organization). IS Code (Code on Intact Stability for All Types of Ships Covered by IMO Instruments) 3.1 General intact stability criteria for all ships3.2 Severe wind and

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Ship motion in waves prediction of dynamic stability

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1. TUMST Ship Manoeuvrability - Theory and Assessment- 1 Ship motion in waves ? prediction of dynamic stability ? Toshio Iseki Tokyo University of Marine Science and Technology

2. TUMST Ship Manoeuvrability - Theory and Assessment- 2 IMO (International Maritime Organization) IS Code (Code on Intact Stability for All Types of Ships Covered by IMO Instruments) 3.1 General intact stability criteria for all ships 3.2 Severe wind and rolling criterion (weather criterion) To be revised in 2007 Weather criterion (SLF 47) Guidance to the Master for Avoiding Dangerous Situations in Following and Quartering Seas (MSC Circ.707) Dynamic phenomena in seaways Restoring arm variation problems Dead ship condition (beam sea resonance) Manoeuvring related problems (broaching-to) As you well know, all ships require to be controllable in direction in the horizontal plane in order to prevent marine casualties happening. In 1993, the Maritime safety committee established the interim standards for ship manoeuvrability and, in 2002, the MSC adopted resolution MSC.137 on Standards for ship manoeuvrability. The main aim of the resolution is to exclude the ships that were built with very poor manoeuvring qualities. Therefore, understanding the theory and assessment of ship manoeuvring performance is still very important.As you well know, all ships require to be controllable in direction in the horizontal plane in order to prevent marine casualties happening. In 1993, the Maritime safety committee established the interim standards for ship manoeuvrability and, in 2002, the MSC adopted resolution MSC.137 on Standards for ship manoeuvrability. The main aim of the resolution is to exclude the ships that were built with very poor manoeuvring qualities. Therefore, understanding the theory and assessment of ship manoeuvring performance is still very important.

3. TUMST Ship Manoeuvrability - Theory and Assessment- 3 IMO (International Maritime Organization) Restoring arm variation problems Parametric oscillation Pure loss of stability Stability problems occurring for any ship having large righting arm variations between trough and crest condition. As you well know, all ships require to be controllable in direction in the horizontal plane in order to prevent marine casualties happening. In 1993, the Maritime safety committee established the interim standards for ship manoeuvrability and, in 2002, the MSC adopted resolution MSC.137 on Standards for ship manoeuvrability. The main aim of the resolution is to exclude the ships that were built with very poor manoeuvring qualities. Therefore, understanding the theory and assessment of ship manoeuvring performance is still very important.As you well know, all ships require to be controllable in direction in the horizontal plane in order to prevent marine casualties happening. In 1993, the Maritime safety committee established the interim standards for ship manoeuvrability and, in 2002, the MSC adopted resolution MSC.137 on Standards for ship manoeuvrability. The main aim of the resolution is to exclude the ships that were built with very poor manoeuvring qualities. Therefore, understanding the theory and assessment of ship manoeuvring performance is still very important.

4. TUMST Ship Manoeuvrability - Theory and Assessment- 4 Contents Basic theory of ship stability Meta-centric height Stability curve Dynamic stability in waves Wetted surface & dynamic pressure Instability of rolling motion in waves Simple simulation program Short presentation This lecture is devoted mainly to the conventional rudder steered ship.This lecture is devoted mainly to the conventional rudder steered ship.

5. TUMST Ship Manoeuvrability - Theory and Assessment- 5 Meta-centric height “GM”

6. TUMST Ship Manoeuvrability - Theory and Assessment- 6 Meta-centric height “GM”

7. TUMST Ship Manoeuvrability - Theory and Assessment- 7 Evaluation of GM

8. TUMST Ship Manoeuvrability - Theory and Assessment- 8 Actual ship configuration

9. TUMST Ship Manoeuvrability - Theory and Assessment- 9 Righting lever GZ (Restoring arm)

10. TUMST Ship Manoeuvrability - Theory and Assessment- 10 GZ Curve

11. TUMST Ship Manoeuvrability - Theory and Assessment- 11 Dynamic stability

12. TUMST Ship Manoeuvrability - Theory and Assessment- 12 Underwater configuration in waves

13. TUMST Ship Manoeuvrability - Theory and Assessment- 13 Underwater configuration in waves

14. TUMST Ship Manoeuvrability - Theory and Assessment- 14 GZ curves in waves

15. TUMST Ship Manoeuvrability - Theory and Assessment- 15 Displacement of the center of buoyancy

16. TUMST Ship Manoeuvrability - Theory and Assessment- 16 Displacement of the center of buoyancy

17. TUMST Ship Manoeuvrability - Theory and Assessment- 17 Dangerous condition Deep water

18. TUMST Ship Manoeuvrability - Theory and Assessment- 18 Container ship (Lpp=300m)

19. TUMST Ship Manoeuvrability - Theory and Assessment- 19 Estimation of ship stability in waves

20. TUMST Ship Manoeuvrability - Theory and Assessment- 20 Co-ordinate systems First of all, we have to define the co-ordinate systems to make up the equations of motion. Let’s consider a ship with constant speed vector U.First of all, we have to define the co-ordinate systems to make up the equations of motion. Let’s consider a ship with constant speed vector U.

21. TUMST Ship Manoeuvrability - Theory and Assessment- 21 Co-ordinate system

22. TUMST Ship Manoeuvrability - Theory and Assessment- 22 Equations of waves In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.

23. TUMST Ship Manoeuvrability - Theory and Assessment- 23 Equations of waves In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.

24. TUMST Ship Manoeuvrability - Theory and Assessment- 24 Equations of waves In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.

25. TUMST Ship Manoeuvrability - Theory and Assessment- 25 Equations of pressure In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.In general case, we need only consider equations of motion along the x and y axes and angular motion about the z axis for a surface ship. It should be noted that the equations are based on the body axes not on the space axes.

26. TUMST Ship Manoeuvrability - Theory and Assessment- 26 Simple Simulation of rolling motion in waves

27. TUMST Ship Manoeuvrability - Theory and Assessment- 27 Simulation of rolling motion in waves

28. TUMST Ship Manoeuvrability - Theory and Assessment- 28 GZ curves of the ship

29. TUMST Ship Manoeuvrability - Theory and Assessment- 29 Summary Basic theory of ship stability Dynamic phenomena in seaways Restoring arm variation problems Simple simulation of roll in waves

30. TUMST Ship Manoeuvrability - Theory and Assessment- 30 Ship motion in waves ? prediction of dynamic stability ? The end

31. TUMST Ship Manoeuvrability - Theory and Assessment- 31 Assignment Suppose that a ship is traveling at the speed of 20 knots in following seas and the ship’s length is 200 (m). From the viewpoint of the restoring arm variation problem, Estimate the speed of the most dangerous wave. Calculate the encounter period.

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