Calculation And Study On Structure Strength Of Twin Hull Sand Dredge

The advantages of engineering ship using the twin hull form are obvious, such as: broad deck, good stability and anti-drift performance, facilitate arrangements for persons and operating machinery. The broad deck provides enough space for lifting equipment, positioning equipment and a variety of construction materials, so an increasing number of water works to start using the twin hull ship as a working platform. Therefore, the nonpropelled twin hull engineering ship has good application prospects.In this thesis, the sand dredge used twin hull structure. Because of the requirements of suction equipment and working condition, the structural design of twin hull sand dredge is special, the cross-structure can't meet the specification requirements, which need to be calculated directly.In this thesis, made use of software ANSYS to calculate the strength of a 45-meter twin hull sand dredge structure. In transverse bend and reverse conditions, the thesis selected reasonable load and constraint and analysed the whole twin hull sand dredge through Finite element calculation. According to the results of the calculation, the thesis provided a reference for the structural design of these catamarans which have a special structure. This thesis analyzed the stress distribution in the cross-structure and discussed the regularities of the stress distribution. According to the stress distribution in cross-structure and portal framed structure, the thesis presented the remodified programs about the cross-structure and portal framed structure of the twin hull sand dredge. Then the thesis calculated the remodified structure through Finite element analysis, and provided a remedial program which may reference for the existing twin hull sand dredge. Finally this thesis, based on the ANSYS, made the optimization design to the portal framed structure of a twin hull sand dredge. By optimizing the cross-section sizes of the portal framed structure component, the weight of the portal framed structure had been decreased when it met the requirement of stress. According to the results of optimization, the thesis selected the standard steel for the portal framed structure, and then proved the optimization results by finite element calculation. The optimization design decreased the weight of the portal framed structure and reduced the cost of shipbuilding when it met the requirement of stress, and provided a reference for the same type twin hull engineering ship.