Research On Lightweight Design Method Of Cruise Ship

The cruise ship lightweight design can effectively reduce the use of building materials and construction costs,reduce fuel consumption,and can improve cruise navigation performance,reduce cruise operating costs,and help improve the stability of handling.Considering that cruise ships have huge superstructures and higher requirements for vibration,superstructures are the focus of research.The collaborative design of vibration and lightweight is the key to cruise ship lightweight design.Therefore,based on the analysis of the strength and vibration characteristics of the ship,this paper conducts research on the lightweight design method of the ship’s local stiffeners and the ship as a whole.Finally,based on the research results,a comprehensive ship lightweight design scheme is proposed to form an effective and feasible cruise ship lightweight design method.Research work mainly includes:(1)Carry out structural analysis and research on the whole ship.Firstly,a finite element model of the whole ship structure was established,and the strength analysis of the ship structure was carried out.The calculation showed that the ship had a certain lightweight space within the allowable stress specified in the construction code.After supplementing the finite element model of the fluid domain,a fluid-structure interaction model of the ship was established,and a harmonious response analysis of wet modal calculation was carried out.The error between the simulation result and the measured value of the harmonic response analysis does not exceed 3.5%,which indicates that the finite element model and calculation method are correct and can be used for subsequent research.(2)Taking the ship’s upper stiffened plate structure as the research object,this paper explores the lightweight method of ship local structure.Based on the establishment of the finite element model,combined with topology optimization and size optimization to carry out lightweight structural optimization research,a new trapezoidal stiffened plate structure was designed,and a single plate weight reduction of 19.2% was achieved.The new trapezoidal stiffener was further explored.The law of the influence of different size parameters on the structural characteristics of the plate,and applied to the structure of the section to achieve a 13.5% weight reduction of the section.(3)Carry out research on lightweight design methods for the whole ship.The sensitivity analysis was used to screen out a small number of important design variables,and a response surface function proxy model was constructed to solve the problem that the ship’s vibration response and strength cannot be analyzed at the same time by finite element analysis.The size optimization method was adopted to realize the collaborative design of the whole ship’s vibration and light weight,and the verification and comparative analysis were carried out,and the final weight loss was5.67%.Research shows that the combined design of proxy model and finite element analysis can realize the collaborative design of lightweight and vibration control,and provide a reference for the overall lightweight design of cruise ships.(4)Combined with the optimized design of the superstructure stiffened slabs and the coordinated design of the whole ship’s size and vibration,the overall ship’s comprehensive light-weighting solution can meet the ship’s strength requirements while reducing the weight by 6.67%.