| In recent years,China's social economy develops rapidly and people's living standard has been greatly improved.People's needs have shifted from basic material to higher level spiritual enjoyment,and recreational fishery came into being.Leisure fishing boat is an important tool for the development of recreational fishery,and because the catamaran has many advantages such as good stability,comfortable and so on,it is the ideal ship type for marine sightseeing and offshore angling.In this paper,a 34.7 metre catamaran fishing boat is taken as the main study object.According to Requirements of China Classification Society(CCS)'s rules,a method is presented to calculate wave loads and analyse structural strength of the catamaran fishing boat.This provides a reference for the design and construction of other catamaran and technical support for the promotion and development of leisure fishing catamaran.It has a certain practical significance for promoting the development of leisure fishery in Zhoushan.This paper firstly analyzes the wave loads of catamaran fishing boats,presents the principle and the method of directly calculating wave loads,and the directly calculated value and the standard calculated value of wave loads are compared and analyzed to determine the input loads of the structural total strength analysis of the catamaran fishing boat;Secondly,the finite element model of the whole catamaran fishing boats' structures is set up,and the total strength(including longitudinal strength,transverse strength and torsional strength)is analyzed after exerting boundary constraints and loads to study the stress distribution of various parts of the hull,the cross-structure in particular;Then joints of connection bridge and two demihulls are analyzed by using refinement grid model to express stress distribution in detail;Lastly the cross structure's buckling strength is assessed to analyse buckling strength characteristics of each member. |
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