The Damage Characteristics Of Gravity Platform Under Ship Collision Impact And Optimization

Since the industrial revolution, the global economic development has a rapidly growing demand for oil and gas and land resources have been a large number of mining, therefore, many advanced countries in the world have focus on the ocean. Most of the oil fields discovered in the neritic zone of the Chinese Bohai Sea are marginal oil fields and the development of special oil and gas fields should use the appropriate type of offshore platforms. The selected research object of this article is the shallow sea gravity platform, which is specifically applicable to the marginal oilfield, and this paper will analyze the platform from the aspect of the ability to resist the impact of the ship collision.Collision between ship and offshore structure is a non-linear dynamic response subject to a large impact effect within a very short period of time and the process is very complex and can be divided into geometric nonlinear, material nonlinear and contact nonlinear, etc. This paper firstly introduces and summarizes the present research situation and the mechanical mechanism of dynamic collision. Then the explicit finite element numerical simulation method is introduced in to simulate the collision process between designed platform and ship in different working conditions, from which the results can be got to analyze and compare. Finally, based on so much data, this paper tries to give the appropriate advice to improve the anti-impact property of the platform. The main content of this paper includes:1.This paper summarizes the present research situation and main calculation methods of the ship-platform collision problem. The advantages and disadvantages of different methods are introduced respectively. Then the finite element method is selected as the main research method of this article.2.The finite element method involved in the development process and applications of collision field is introduced in detail. The key technologies and means, including the contact problem with friction, material failure criterion, etc, are also mentioned in this paper. Then this paper simply introduces the explicit finite element software DYNA and some functional software units.3. This paper uses DYNA software to establish a model for the designed original platform and simulates the collision process between platform and ship with different quality and different speed. Then this paper tries to explain some phenomenas appeared in the process of collision and compare the response data under different working conditions.4. According to the collision analysis results of the original model, this paper gives some modified advices to reinforce the anti-collision ability, including the improvement in structure types and the change in sizes of local components. Then this paper stimulates the collision of the new models and the corresponding results can be got and compared. Then the reasonable and effective recommendations are put forward for the practical engineering.