中文摘要：

以某超大型导管架为例,利用惯性元件/GPS组合系统分别对导管架和驳船在下水过程中的运动轨迹进行测量。当导管架处于水面上时,利用精度较高的GPS测量其运动速度；当导管架入水后,GPS失效,利用惯性元件测量导管架加速度；结合姿态矩阵解算导管架和驳船在下水过程中的运动时历；对比导管架运动的实测和数值计算的结果,验证数值计算的准确性。结果显示,采用惯性元件/GPS组合系统可以准确测量出导管架在下水过程中的运动轨迹；数值计算得出的运动幅值略大,原因可能是计算中的阻尼估计不足。

英文摘要：

With the development of offshore oil and gas in our country, the jacket platform becomes more and more popular and its dimension increases. Therefore, jacket launch has become the most wildly used way for jacket installation. This paper presents the field measurement of a mega jacket launch. This measurement is designed to record the trajectory of both the jacket and the launch barge. Both Inertial Navigation System （ INS） and Global Positioning System （ GPS） are used to ensure the accuracy of the field measurement. The GPS is used to measure the velocities of the jacket above water. When the jacket completely goes into water, the INS is used to measure the accelerations of the jacket because the GPS can’ t work under water. The motion time series of both the jacket and the barge are calculated. The results of field measurement are compared with those got from numerical simulation.