| With the development of offshore oil industry,various types of offshore platform is developing toward large-scale,integrated,platform structure weight also increased,so that the difficulty of platform installation increase in our country,offshore oil resources volume accounted for 23% of the total petroleum resources,therefore in China’s offshore oil industry is particularly important.With the development of offshore oil industry,various types of offshore platforms are developing towards large-scale and integrated development,and the quality of platform structures is also increasing,which makes platform installation more difficult.Nowadays,the installation of the platform structure has become a hot spot in the research of marine engineering.Because of the superiority of floatover method to install the platform,make it become widely used in installation and installation method of platform structure,now the preferred method of large platform structure installation has become.In the process of float over platform installation,because the LMU device plays a very important role,so the optimization design on the LMU device are an important part of the float over installation platform.This paper focuses on an important device in the float over installation leg coupled device(LMU)have been analyzed in detail,and the optimization design.The future development of offshore oil exploitation to float over the deep sea area,will also become the installation method for large ocean deep sea platform.Based on the method of float over installation of offshore platform and familiar with LMU structure,using ANSYS finite element analysis software to establish leg coupled device(LMU)finite element model of the structure,size of the force calculation of the structure in the uplift in the installation process,and analysis of different rubber layers and the thickness of the steel plate on the leg force coupling device the performance impact,make the optimization results more close to reality,has more practical value.These advanced technology for large-scale offshore oil exploitation and resource exploration and development has great significance,it is also the direction of the float over installation.Due to the advantages of the float-over installation process,the float-over installation becomes a large platform installation first.LMU is a key device to the float-over installation process.In order to optimize the elastic core of LMU,first of all,using ANSYS for the establishment of the model;then,under given conditions,using the stress analysis of ANSYS to found that the displacement was 85.769 mm at the time of the vertical load 2000 t and the horizontal load 500 t,maximum stress is 1220Mpa;finally,for the two optimization,the first is to optimize the rubber ring,found that the thickness of the rubber ring,the optimal size of 130 mm,the second is to optimize a steel ring layer,It is found that the cushioning of the elastic core is improved when the steel ring layer is 12.Ultimately determines the optimum elasticity of elastic core model is: the thickness of the rubber ring is 130 mm,rims layer number 12. |
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