Study On Rigid-flexible Coupling Dynamic Characteristics Of Integrated Disassembly System For Offshore Platform

With the development of offshore oil and gas,many oil and gas fields gradually cannot meet the production capacity requirements,so the dismantling work is imminent.The project team plans to develop a set of integrated disassembly equipment,but due to the complexity of the marine environment,the disassembly system will inevitably bear the combined action of static load and various dynamic loads,and the strength and stability of the connection structure between the components will be greatly challenged.Through the research on the dynamic characteristics of the integrated disassembly system,this paper provides the basic support for the structural design and optimization of the key connection parts,so as to ensure the reliable operation of the integrated disassembly equipment of the super large offshore oilfield facilities.Firstly,the whole disassembly scheme of the integrated disassembly system is introduced,and then the calculation condition of the key component flexible lifting arm is analyzed and determined.Then,according to the characteristics of the research object,the mathematical model of the working condition of the lifting arm is established,and the finite element is used to discretize it,and the floating frame method is used to describe the deformation and movement of the lifting arm,Then,the dynamic equations of the unit and system of the flexible lifting arm are established with the help of Lagrange equation.Then,the section shape of the lifting arm is simplified.Finally,the numerical simulation model is built in Simulink to solve the dynamic equations of the flexible lifting arm and make relevant analysis.Secondly,according to the parameters of the physical model of the disassembly system,the finite element model of the lifting arm is established,and the modal analysis is carried out to obtain the natural frequency and vibration mode of the flexible lifting arm,and then the transient analysis of the lifting arm under specific working conditions is done,the dynamic response of the lifting arm is obtained.Finally,the transient analysis results are compared with the calculated values under static load.The 3d model of the disassembly system is built by the modeling software,then the model is introduced into Adams and the multi-Rigid body dynamics simulation analysis is carried out to get the dynamic load produced by the multi-rigid-body motion the rigid lifting arm in Adams is replaced by the flexible lifting arm in ANSYS.On the basis of multi-rigid-body analysis,the kinematics and dynamics simulation of rigid-flexible coupling system is carried out,the dynamic response of the lifting arm and the dynamic load produced by the flexible body motion are obtained and compared with the dynamic load produced by the rigid body motion.Finally,according to the similarity relation,the model of disassembly system is established,the experimental platform is set up and the dynamic response experiment is carried out.