Impact Dynamic Response Analysis Of Spar Platform Based On Anti Collision Device

The offshore SPAR platform has unique advantages over other offshore platforms.It is of great significance for mankind to exploit oil and gas deep in the ocean to ease the tension of resources on land.In addition.Along with the National Fourteenth Five-Year Plan in the field of deep sea exploration and development.Promoting the building of a maritime community with a shared future.The number of major collisions between offshore facilities and shipping vessels is increasing.And once these maritime accidents occur.It is highly likely to cause property loss,structural damage to equipment and even casualties.So.In the platform design and its operation by considering the addition of relevant anti-collision devices.It is necessary to mitigate the damage at the contact point of the collision between the ship and the offshore platform in the future.This paper is based on this starting point.A floating aluminum honeycomb foam shock mitigation and energy dissipation anti-collision device is proposed.The dynamic response of the collision model of platform-anti-collision system-ship was simulated and analyzed.Verify the energy dissipation property of anti-collision device.Then the impact of collision parameters on the motion response of the whole platform structure during the collision process is discussed and the energy dissipation law and damage mechanism of each part of the anti-collision system are obtained.The specific work of this thesis is as follows:(1)This thesis first summarizes the development history of the current SPAR platform.The research status of collision between offshore platforms and vessels at home and abroad is reviewed.The development of anti-collision devices at present and the possibility of composite materials used in anti-collision devices and offshore engineering are summarized.(2)According to the constitutive model and failure criterion of composite material and aluminum foam in the finite element software ANSYS.A floating aluminum honeycomb foam shock absorber and energy dissipation anti-collision device is proposed.The overall collision model of ship-anti-collision device-platform is preliminarily established.(3)The 3D model of the whole platform structure is constructed and the grid is divided.On that basis.Simulation of a 5000 T class supply ship(OSV)with a fixed collision speed of2m/s under uncontrolled condition.The whole collision process of floating body complement near the surface of Truss Spar platform.The motion responses of collision simulation under two working conditions were analyzed with or without anti-collision device.The analysis results show that: under the premise of setting anti-collision device.The maximum impact force was reduced by 82.1 percent.The collision time was extended by 2.57 s.2.16 times as much as that in the case of no lamination.The maximum equivalent stress of the platform structure in collision is reduced by 95%.The collision energy in the whole process is absorbed mainly by the anti-collision device.It can absorb 69.6% of the impact energy.The structural impact damage of the platform is greatly reduced.The anti-collision device has good energy dissipation property.(4)Based on previous verification of the anti-collision device.By taking into account the uncertainties in the process of ship collision.The changes of key collision parameters of ships are discussed.The collision velocity and tonnage quality of the collision ship are analyzed respectively.The influences of these collision parameters on the energy conversion,impact force variation and equivalent stress response of the platform structure and anti-collision system are studied.The damage mechanism of each part of the anti-collision device under different working conditions is obtained.