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With the growing demand of offshore oil and gas resources, oil drilling platform will be developed furthermore, platform supply vessel which is served for oil drilling platform will has great development space. As the core of a ship, propulsion system is very important. It is the highlight to design an economic, reliable, practical propulsion system for platform supply vessel.At present, diesel-propeller power plant is applied to most platform supply vessel in China , foreign countries have widely used electric propulsion in this kind vessel. Based on development trends at home and abroad, searches and reads a great of articles and papers, this paper sums up the design feature of platform supply vessel, gives some typical main propulsion plant methods, provides a reference for select of main propulsion plant.In this paper, the main propulsion system of 71m platform supply vessel is considered as the object, at the basis of information, this paper brings forward five kinds of main propulsion designs(four main engine-double propeller, double main engine-double propeller, electric propulsion with contra-rotating z-drive propeller, electric propulsion with podded propulsor, waterjet propulsion), uses the fuzzy comprehensive evaluation and builds the fuzzy comprehensive evaluation model of the five propulsion system. Evaluate them from technology, economic, performance and implement difficult. Finally, the result is got and the best design is determined by using this method. According to the result, analyze the strengths and weaknesses of the programs. Supply some reference for selection analysis of platform supply vessel.After determined the propulsion system of this vessel, this paper do the design further more in order to get some important parameters(main engine power, propeller efficiency-open water, propeller diameter and so on). Do the preliminary match design by B4-55 diagram and get the result which is used as reference. In the end match design, apply optimization design, determine the objective function (the highest efficiency) and the constraints, build optimization model satisfied the vacuole proof. This optimization model is very complicated and it has many data, so SQP(Sequential Quadratic Programming)is used to solve this problem and apply MATLAB software Optimization Toolbox (fmincon function) for handling the optimization model. Finally, result is obtained, provide reference for further design.This thesis does another research on the application of fuzzy comprehensive evaluation on main propulsion selection, at the same time, optimization design is applied in main propulsion match design. These are in order to build a best main propulsion system.
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