海洋可控源电磁拖曳系统运动仿真模拟研究

Dynamic Simulation of the Towed Marine Controlled-Source Electromagnetic System

海洋可控源电磁拖曳系统是海洋可控源电磁勘探系统的重要组成部分,对光电复合缆和绞车的强度有着较高的要求。为了保障作业安全,避免拖缆崩断、绞车损坏等事故的发生,需要对拖曳系统所受的张力进行评估,为实际作业提供参考。本文采用拖曳系统稳态运动求解方法,模拟拖体在海水中的位置,以及放缆时绞车所受的牵引张力,模拟结果与海试实测数据能够较好地吻合。在拖缆长度一定的情况下,随着拖曳速度的增大,绞车牵引张力先减小再增大,光电复合缆长度越长这种现象越明显。

The marine controlled-source electromagnetic method(MCSEM)is a new marine geophysical exploration technology,which has been applied to offshore hydrocarbon explorations.It′s imperative to simulate the tension of the tow cable to guarantee the safety and provide reference for the practical operation.This paper uses the steady state solution method to simulate the trajectory of the towed underwater body and the winch’s tension.The results are in good accordance with the measured data during the sea trial.For a fixed length of the towed cable,the winch’s tension decreases first and then increases with the increase of the towing speed.The longer the length of the cable is,the more obvious this phenomenon becomes.