深水海洋钻井平台振动特性研究

Research on the Vibration Characteristics of Deep Water Drilling Platform

海洋油气勘探力度的加大使钻井平台的使用量增加,结构的振动行为对平台的使用与维护都具有重要影响。通过建立海洋平台的悬臂梁模型,对结构进行质量、刚度和阻尼等效,分析了结构的单自由度自由振动响应和承受简谐外激载荷时的受迫振动响应。通过对振动响应幅值求极值,得到对应与阻尼比相关的频率比,此时系统出现共振现象。对于小阻尼比系统,当外激频率接近固有频率时易出现共振现象。

With the development of exploration in offshore oil and gas, the number of drilling platform increased, and the vi-bration characteristics of structure plays an important role in using and maintaining the platforms. Based on a cantilever beammodel with equivalent mass, stiffness and damping, free vibration in a one degree of freedom and forced vibration of the oceanplatform were studied. By solving the extreme value of the response, frequency ratio that relevant to the damping ratio was ob-tained; and in this case, resonance occurred. Thus to the small damping ratio system, resonance easily occurred when exter-nal frequency was close to the natural frequency of the system.