Design of a Quadramaran Vessel

A new innovation in the world of multi-hull vessels has been proposed, by arranging the four spindle submarine type of hulls (A QUADRAMARAN) for higher stabilization and introducing new structural synthesis phenomenon which is a complete deviation from existing classification society approaches on structural design. A structural synthesis approach/method routinely used to design & build internally pressurized filamentary vessels is modified for application onto a radically different design of externally pressurized steel hulls. In the design process beginning with shell equilibrium, choosing geodesics as reinforcement directions, using Netting theory and integrating resulting ODEs, we arrive at a solution as demanded optimum shape rather than analyzing pre-determined shapes of hull body plan. That a zero hoop stress case of doubly curved rotationally symmetric pressure shells is same in composite and metallic design, this approach is adopted for steel. This consideration has lead to a corrugated/bellow/unduloid shape, more pointed on the outside than the inside. Very rigid structure resulted as expected through the composite route. FE analysis proves strength and stability of the resulting form.