Design And Optimization Of X-cantilever For Jack-up Drilling Platform

Cantilever beam is the key equipment of jack-up drilling rig.The performance of cantilever beam directly affects the drilling ability of the platform.Therefore,it is of great significance to carry out the structural design and optimization of the cantilever beam.In this paper,a cantilever beam structure is designed for a 400 ft self-elevating drilling rig.Firstly,based on the basic design parameters of the cantilever beam,the loads on the various parts of the cantilever beam structure are analyzed to determine the length and width of the cantilever beam.And height,laying the foundation for the cantilever structure design of jackup drilling platform.Secondly,the finite element model of the cantilever beam system was established by ANSYS software.The grids were divided and the nodes were connected.According to the working condition of the cantilever beam of the jacking platform,the finite element model of the cantilever beam was restrained and loaded.Metamodel static analysis,a total of five conditions were selected to check the strength of the cantilever structure.After that,the cantilever test model was established based on the scale scale theory.The test bench was set up to test the five conditions of the finite element simulation.The simulation data and the test data of the cantilever were compared to verify the rationality of the cantilever structure design.Afterwards,the dynamic analysis of the cantilever beam structure is carried out.Under the condition of the maximum extension of the cantilever beam,the first 8 natural frequencies and modes of the cantilever beam structure are determined by modal analysis.Then on the basis of modal analysis,the transient dynamic analysis of the cantilever structure was carried out,and the dynamic response of the cantilever structure under the transient load was obtained.The results show that the influence of dynamic load on the cantilever structure is obvious.Finally,based on the maximum normal stress on the structure of the cantilever beam structure optimization design,comparison and analysis results before and after optimization,the optimization scheme for evaluation.