| Jacket platform is a major structure form of offshore platform which our country develop oil and gas resources of offshore. In these years, its design, construction, installation technology has been gradually strong. It widely used in offshore and shallow cover area, make an indelible contribution on China's oil and gas reserves. In the process of design of the jacket platform, the structure dynamic analysis is very important. It is very important about the safety of the platform on the sea. Model experiment can avoid numerical simulation in the process of calculation error, allowing researchers grasp the dynamic characteristics of structure more accurately. There are many researchers carry out relevant research for model experiment now.This paper does a model experiment for a jacket platform.The major aspects of the research are shown as follows.Firstly, this paper use elastic similarity law, design and build a similar experiment model based on a jacket platform, make dynamic experiment study,and do the finite element modal calculation for the prototype and the model,prove the dynamic similarity relationship between model and prototype, in order to do the experimental study on the dynamic model.Secondly, using the hammer, vibration sensor, data acquisition equipment to make up a testing system.Doing the modal frequency detection, to get the measured modal frequency of the structure.Thirdly, using modal vibration exciter, vibration sensor, data acquisition equipment to make up a testing system. Doing the random response curve detection.Fourthly, comparing the experimental results with the results of numerical simulation.The result is match the results of numerical simulation. It can prove the modal frequency and dynamic response of the structure is relatively accurate.The model experiment laid the foundation of the future experiments which is about the damage detection or response of the wave,it has a significant meaning on the security service of the platform. |
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