Dynamic Simulation And Intensity Analysis Of Offshore Gangway Structure Based On The Stewart Stabilized Platform

In recent years,in order to respond positively to the strategic goal of building a country network strong in maritime capacity and the transportation,the development of marine resources and the process of research on offshore equipment are gradually accelerating.Therefore,the importance of the offshore gangway as an important maritime transfer tool is also increasing.increase.In the actual working environment,under the interference of external factors such as wind,current and waves,the offshore platform and the ship will be shaken,which will greatly interfere with the normal work of the platform equipment,and at the same time bring certain hidden dangers to the safety of workers who use the gangway.The offshore gangway system based on the Stewart stabilized platform studied in this project is a new type of parallel structure.The system has six degrees of freedom motion compensation function,which has the advantages of strong rigidity,the ability to carry large loads,and high precision.The device can still carry normal loads under the influence of the wind,waves and currents at sea movement requirements.Firstly,according to the wave motion,the characteristics of the parallel mechanism and the working conditions,the overall frame and structural dimensions of the offshore gangway system based on the Stewart stabilized platform are designed at the initial stage.The existing sea transfer gangway is analyzed comprehensively,and the telescopic gangway of the sea bridge is proposed.Design requirements and on overall solution are proposed,and SolidWorks software is used to complete the modeling.Secondly,based on the overall frame and structural dimensions of the design,the kinematics analysis of the drive rods and the telescopic gangway of the Stewart stabilized platform on the sea bridge is carried out,by using the positional inverse solution and the MATLAB software;the three relations are not equal,and then the structural parameters are further corrected according to the analysis results.,to ensure that the system can perform normal compensation movement under the action of wave motions,and finally lay the foundation for the next dynamic simulation analysis,and provide the basis for the motion control of each drive rod of the offshore gangway system.Then according to the results of kinematics analysis,the ADAMS software is used to analyze the dynamics of the offshore gangway with the telescopic gangway and the Stewart stabilized platform.Firstly,the constructed 3D model is imported into the ADAMS to generate the corresponding virtual prototype to implement the dynamic simulation analysis,the results of the analysis are then used to verify the motion compensation status of each structure of the platform,so as to obtain the relationship curve of the universal joint and the driving rod under the driving force with time,and obtain the system load data for subsequent research.Finally,based on ABAQUS and ANSYS softwares,the finite element analysis of the universal joint and the telescopic ramp ladder of the Stewart stabilized platform on the offshore gangway is carried out,and the analysis results are compared with the corresponding material properties to confirm that the offshore gangway system meets the design requirements and provides a basis for future industrial product development.