Curved Stiffeners

The object of the curved stiffener is read from SB_OGDB. The mould line is shortened at its terminal points, according to the variables ss, se defined in the attribute 101 (DIC) of a curved stiffener.

The cross-section figure of the profile is generated and turned to angle (ts + te)/2 measured from the moulded plane of the stiffener, where ts and te are the angles at the terminal points of the profile.

The mass center of the cross-section figure, (au1, av1) is calculated in its own plane coordinate system.

The moulded contour of the stiffener is moved in the moulded plane, resulting in the neutral axis of the profile. The length of the neutral axis is changed at the terminal points so that the end cuts can be considered as perpendicular without errors in volume or weight. The w-coordinate of the mass center is av1 (of the cross-section figure). The mass center is now transformed into the ship coordinate system.

The weight is now equal to the length multiplied by the cross-section area and density.

Figure 1:2. Mass center of cross-section.