海洋钻井平台齿轮齿条升降装置的动态响应分析

Analysis of the Dynamic Response of Rack-and-gear Lifting Device for Offshore Drilling Platform

自升式海洋钻井平台齿轮齿条升降装置的动力学特性对平台结构安全性能有极其重要的影响。在动力学分析的基础上,建立了多对齿轮齿条啮合下的升降装置动力学模型,研究了齿轮时变啮合刚度对系统动态响应的影响规律,同时利用Solid Works与ADAMS软件联合建模,进一步分析了升降装置最大负载工况下齿轮齿条之间的接触力及齿轮转速随时间的变化规律。研究结果表明:齿轮齿条升降装置齿轮的输出转速受内部激励的影响随时间发生变化,且与啮合力之间存在冲击峰值的同步性;在同一工况条件下,相对于齿条对称分布的两个齿轮,同一时间所受到的径向力大小相等、方向相反,且切线方向的接触力大小之和与负载基本相等。研究结果可为自升式海洋钻井平台齿轮齿条升降装置的优化设计提供参考。

The dynamic characteristics of rack-and-gear lifting device of jack-up offshore drilling platform have a great impact on the safety performance of platform structures. On the basis of kinetic analysis, the kinetic model of the lifting device under the meshing of multiple pairs of racks and racks was established. The influence pattern of the time-varying meshing stiffness of the gear on the dynamic response of the system was studied. At the same time, the model built by SolidWorks and ADAMS software would help for further analyses of the contact force between the gear ＆ rack and the change of the gear speed with time under the maximum load condition of the lifting device. The results show that the output of the gear rotation speed of rack-and-gear lifting device varies with time due to the internal excitation and there is synchronism of the peak value within the meshing force. Under the same working condition, the radial forces of the two gears which are symmetrically distributed with the rack are equal at the same time, but opposite in direction and the sum of the contact forces in the tangential direction is almost equal to the load. The findings can provide reference for optimal design of rack-and-gear lifting device of jack-up offshore drilling platform.