Simulation Research On Hull Lifting Process Based On Multi-body Dynamics

The traditional hull segment lifting scheme is designed according to the experience,and then the standard cable tension is selected to check the strength of the lifting point.The traditional method can not find the interference in the lifting process,and can not obtain accurate rope tension,but only use the larger safety factor to ensure the safety of the lifting process.To solve these problems,we study and develop effective solutions with simulation tools.The hull segment lifting is a dynamic process,and the dynamic software can be used to predict.However,there is no dynamic simulation software for the subsection lifting of the hull.In the study,the open source dynamic library ODE is used to develop the simulation software for segmented lifting.At the same time,the 3D modeling function is realized with the graphics library of the OpenGL.In the study,the model data of the Tribon is used to establish the external database of the hull section,which provides the data interface for the transformation of the hull section model in different development environment.At the same time,in order to improve the reliability of the simulation,the simulation inertial matrix algorithm,collision detection technology,and the dynamic load of the rope are deeply studied,and the method of discrete calculation,collision detection and static equilibrium analysis is put forward.Finally,the function of each simulation module is integrated,and the dynamic simulation system used in hull subsection lifting is developed.The system emulate the lifting process of the hull section,detect whether the interference phenomenon occurs during the operation of the lifting system,monitor the tension of the wire rope,obtain the maximum dynamic load,and provide the accuracy for the strength checking External force.