Receiving And Releasing The Rope Process Of The Full Ocean Depth Winch System Of The Research Vessel And Dynamic Behavior Research

Marine resources are rich,and scientific research ships must be used to reasonably explore and utilize Marine resources.However,the variable sea conditions,especially the full ocean depth conditions,have a great impact on the sampling operation of scientific research ships,and many complex and changeable factors are easy to lead to the failure of the sampling operation.Therefore,it is very important to accurately predict the motion track and force state of the sampler,and to explore the variation law of the dynamic characteristics of the sampler in the full ocean depth condition.In this paper,the dynamic behavior of the rope is studied in the process of retracting and releasing the rope system of the full ocean depth winch for the whole oceanographic exploration.The analysis software Orcaflex is used to conduct the time-domain analysis under irregular waves.For different actual sea conditions,the tension of the rope and the offset of the sampler are selected as the analysis parameters to conduct the time-domain response analysis.The variation rule of rope tension and sampler offset under the condition of full ocean depth was investigated.This paper mainly carries out the following aspects:(1)Based on the full ocean depth winch rope system,the feasibility of the rope retracting and releasing process of the full ocean depth winch rope system for the marine exploration is explored.Combined with the different working conditions of the full ocean depth,the mechanics and mathematical models of the rope and the hull are established,and the movement behavior of the system is obtained,which provides theoretical support for the hydrodynamic analysis of the hull.(2)Based on the existing hull parameters,a three-dimensional hydrodynamic numerical model of hull motion is constructed.Combined with the AQWA module in the large commercial software ANSYS,the hydrodynamic analysis of the hull is carried out,and the relevant hydrodynamic parameters of the full ocean depth research ship are obtained.According to the simulation results,the amplitude and variation trend of the hull’s additional mass and radiation damping curves meet the requirements of the industry,which proves the reliability of the simulation analysis based on the hull model.(3)The analysis software Orcaflex is used to build a numerical simulation model of the hull-rope-sampler coupling system,and explore the process of receiving and releasing ropes at the maximum sea depth of 11000 m.The morphological parameters of the rope and sampler under different wave angle,different rope material,different rope lowering speed,different sea depth and different sea state grade are analyzed.It provides some reference value for deep sea sampling research.(4)By using the existing ocean test data and comparing with the above simulation analysis data,the receiving and releasing process of the marine winch rope system for the whole ocean depth scientific survey is verified,and the feasibility of the receiving and releasing process of the Marine winch rope system for the whole ocean depth scientific survey and the correctness of the hull-rope-sampler coupling dynamic behavior parameters are verified.