下放式海洋观测中同轴铠装缆自缠绕/打结原因浅析及解决方案

Primary Analysis and Solution of the Reason for Self-Winding/Knotting of Coaxial Armored Cable in the Downward Marine Observations

结合CTD/LADCP(Conductivity-Temperature-Depth/Lowed Acoustic Doppler Current Profiler)观测实例,从作业海况、水下单元架构、水下姿态三方面分析研究下放式海洋观测中同轴铠装缆自缠绕/打结状况发现,仪器观测架在布放过程中存在旋转现象,旋转产生的扭力作用于同轴铠装缆;扭力得不到释放,在海况较差的情况下极易造成同轴铠装缆的自缠绕/打结。为解决这些问题,本文进一步提出了一套实用的改进方案,在既保证能够在较差海况下作业、又不减少观测仪器的前提下,改进仪器观测架和同轴铠装缆的连接结构,同时增加机械转环及附属结构。观测实践证明,该方案可以有效避免与CTD/LADCP观测类似的下放式观测中同轴铠装缆因自缠绕造成的“打结”现象的出现,大大提高了现场观测效率,保证了仪器安全和数据顺利传输。该技术源自基本海洋观测实践,可为广大海洋调查工作者提供有益的借鉴。

By taking CTD and LADCP observations as the examples,the status of self-winding/knotting of coaxial armored cable in the downward marine observations is analyzed and studied from the aspects of sea conditions during work,underwater unit structures and their underwater attitudes.It can be found that the frame of the observation instrument can rotate during its downward release and the torsion generated by the rotation can act on the coaxial armored cable.If the torsion cannot be released,the coaxial armored cable will easily be lead to self-winding/knotting in poor sea conditions.For solving this problem,a set of practical improvement solutions is put forward,that is,under the premise of working both in poor sea conditions and without reducing the observation instruments the connection structure between the frame of observation instrument and the coaxial armored cable should be improved and the mechanical swivel ring and auxiliary structures should be added.It has been proved that this set of solutions can effectively avoid the"knotting"phenomenon caused by self-winding of coaxial armored cable in ocean observations similar to the CTD/LADCP.This solution can not only improve greatly the efficiency of field observations,but also ensure the safety of the instrument and the transmission of data.This technology is derived from basic ocean observation practices and can provide a useful reference for the vast majority of ocean investigators.