Structural Design And Analysis Of Non-steel Planing Hull

Glass fiber reinforced plastics (G.R.P) has been widely used in the construction of small and medium-sized ship, which has typical characteristics of light weight, anti-corrosion, insulation, non-magnetism, high-strength, and easy maintenance. It has already held a dominant position, especially in the construction of planing hull. Being constituted by resin body and glass fiber and as a kind of compound material, G.R.P has the physical property of aeolotropies.Firstly, the performances of resin body and glass fiber are researched. Then, proper raw materials are selected and G.R.P materials are designed according to the G.R.P hull design requirements. And the assessment calculations of their mechanical properties are carried out.The goal of ship optimization design is to obtain the lightest hull weight and the largest cabin capacity, while on the condition that satisfies the requests of strength and general arrangement. Based on this principle, an objective function for the planing hull is established and several constraint conditions are extracted. Then, constraint conditions are made to be unconstrained by penalty function method. Finally, a mathematical model is established based on genetic algorithm (G.A). And genetic algorithm program is written to optimize the structure of planing hull engine-room.Compared with the steel hull, besides the differences of raw materials, the component connection methods are also very different. The connection method for steel ship generally is welding, while there are various methods for G.R.P. To guarantee the strength of the hull, the proper connection methods of each component are determined after the analysis of several connection methods.Finally, the structure strength of engine-room is checked under two different load cases by use of finite element software MSC Patran/Nastran.