Longitudinal strength

Overall bending of the ship hull as a girder is addressed through the LS module in GHS. It integrates the differences between buoyancy and weight along the length of the hull, thereby deriving shear, bending moment and deflection.

If you dislike the drudgery of assembling a weight curve for longitudinal bending, you will appreciate LS. It does the assembling for you. Give it weight density information in pieces and it produces the composite weight curve automatically. The pieces you give it need not be constant, they can vary as a function of length; or they can be concentrated at a point. Even more helpful, LS automatically adds in the weight density curves for tank loads.

If stress and/or deflection are required, section modulus and/or moment of inertia data can be specified for various locations along the length of the hull.

Of course, LS works with waves, damage and with grounding. It is not restricted to upright conditions - for those situations where bending in other directions is important.

Where deflection is important, LS can be used, with suitable calibration, to predict deflection so that the resulting drafts and hydrostatic properties can be examined with the hog or sag.

LS also computes and displays twisting torque due to weight and buoyancy for the current condition using the existing weight density curve..

LS produces and presents the detailed strength curves along with a summary showing maximum values and locations. You also get fine-looking and serviceable plots of the curves.

In spite of all its rigor, LS usually takes just a split second to produce an answer. And being tightly integrated with GHS, it is quite easy to use.

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Creative Systems, Inc.
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