Study On Structural Lightweight Design Of Large Passenger Ship

Nowadays,with the development of economic globalization,the international trade is becoming more frequent.As the main transportation in the international business,the ship has drawn a great attention,as well as its energy resource consumption and shipping costs.Therefore,the concept of energy saving,emission reduction and green design have been increasingly concerned by the industry.In this work,a large passenger ship is used as the target for optimization of ship hull design and aluminum alloy material consumption,so as to achieve the goal of weight control.This research includes the following contents:(1)Based on the rule calculation method,the longitudinal members of the midship section of large passenger ships are optimized to reduce the midship section area.The dimension of plate and longitudinal structural member in midship section is set as design variables,the dimension,section modulus and hull girder strength of each member in CCS cruise ship code are set as constraint conditions,and the minimum midship section area is set as objective function to establish mathematical model.The multi-Island genetic algorithm is selected to optimize the longitudinal members of the midship section of large passenger ships,and the overall structural optimization design of the cabin structure of large passenger ships is carried out based on the direct calculation method.Taking the lightest cabin weight as the objective function,the components which have great influence on the cabin weight are set as the design variables,and the yielding and buckling strength requirements of the example ship in the direct calculation are taken as the constraint conditions,the multi-Island genetic algorithm is selected to optimize the cabin structure of large passenger ship.(2)The application of aluminum alloy material to superstructure and balcony structure of large passenger ship is studied.Based on the principle of equivalent substitution,the aluminum alloy material replacement design is carried out for the structural plate and stiffener of the cabin structure,and the plate thickness after the replacement of each component is determined,and the strength check and vibration analysis are carried out.The weight difference and mechanical properties before and after replacement are compared and analyzed,and the design scheme of superstructure is given;then the design scheme of balcony structure is given according to the dimension requirements of cruise ship rule.After the design scheme is determined,the design scheme of balcony structure and cabin structure are evaluated,including yielding strength evaluation,displacement analysis and vibration analysis.This part is mainly through the application of lightweight aluminum alloy materials to achieve the lightweight effect.The composite material is applied to the superstructure deck-house of a passenger ship.By studying the provisions of CCS "rule for the construction of fiber reinforced plastic ships" on composite structure design,the composite laminate size of ship superstructure deck-house are determined,and then the mechanical properties of composite superstructure are evaluated,including Strength check and vibration analysis.Finally,the thickness of each component meeting the strength requirements is given,and the superstructure design scheme using the materials meeting the requirements is determined.