5003 Lectures - Faculty of Engineering and Applied Science

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E5003 - Ship Structures I 34 © C.G. Daley Bonjean Curves – Calculating the Buoyancy Distribution Bonjean curves show the relationship between local draft and submerged crosssectional area. There is one bonjean curve for each station. There are typically 21 stations from the FP to the AP, with 0 being the FP. This divides the Lbp into 20 segments. At each station we can draw a bonjean curve of the x-section area; Bonjeans are drawn on the profile of the vessel. With these curves, we can find the distribution of buoyancy for any waterline (any draft, any trim). For hydrostatic calculations we need to know the distribution of buoyancy along the ship. We need to be able to find this for every possible draft/trim. If we had a wall
E5003 - Ship Structures I 35 © C.G. Daley sided vessel, it would be relatively easy to solve for the draft/trim (as in Assignment #1). With shaped hulls, there is a non-linear relationship between buoyancy and position. We use bonjean curves to find the buoyancies as follows. For the typical 21 station ship, we divide the ship into 21 slices, each extending fore and aft of its station. Using the bonjean curve for each station we calculate the total displacement at our draft/trim; 20 ∇=
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5003 Lectures - Faculty of Engineering and Applied Science

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