Research On Structural Design And Optimization Of Floating Crane

With the development of border trade and the growth of regional economic,the inland waterway transportation of Heilongjiang river system has been received far more attention.So it is more and more important to ensure the channel unobstructed and safe.The implementation of the Sino-Russian border river waterway emergency floating crane and it's subsidiary projects can enhance the emergency obstacle clearance ability of boundary river,change the backward way of clearance,improve the level of obstacle clearance technology,to improve the performance of the channel maintenance ship in border waterway.This paper aims at a 200 tonnage emergency floating crane.It must use the Direct Calculation of Method by finite element modeling to check and analysis,and can not only carry on the standard calculation,in terms of strength,because of it scale than the specification requirements.In the premise of working conditions and operation of the emergency floating crane,the main parameters and structure of the floating crane will be determined according to the specification,and calculate the longitudinal strength specification,after that,the basic construction plan and the typical transverse cross-section plan are drawn,and the calculation of the longitudinal strength specification is carried out.The finite element software MSC.Patran is used to model the lifting equipment above the deck and the hull,the load and the boundary conditions are applied,calculating the deformation and total longitudinal strength of the floating crane in different working conditions to ensure that the floating crane has enough strength.Comparing the result with the displacement requirement and the allowable stress value in the specification,it is found that the structural rigidity and strength of the whole ship meet the requirements of specification and have great strength surplus.On the basis of the longitudinal strength analysis,the buckling strength of main longitudinal members in dangerous area are analyzed by finite element method and Matlab programming.The buckling strength calculation results meet the specification,and the difference of buckling factor calculated by the two methods is compared.Although the whole ship structure meet the strength and structural stability of the specification requirements,but there are non-economic and irrationality in the structure of the ship,steel materials,etc.Due to the complex structure,a lot of empirical formula can not be used.Writing command with the optimized parameters and using the MSC.Nastran optimization module to optimize the main hull scantlings structural in different conditions.On the basis of size optimization,the forms of structures of dangerous areas are modified,comparing of different forms in strength improving performance,then determine the optimal structure form.Through a series of comparative analysis,a practical emergency floating crane structure form will be confirmed.This form will guide the following construction of the floating crane,it also can be a technical reference for future emergency floating crane design and development.The results can be used as a reference for the construction of the relevant specifications of the ship,expand and improve the requirements of the ultra-scale ship in the specifications.