Analysis Of Processing Mechanical Behavior For Tensile Armoured Layer Of Submarine Cable And Design Of Tension Control System For Armored Machine

Submarine cables such as steel tube umbilical,dynamic submarine cable and heavy towing cable are important equipment for the development of marine resource and they are widely used in the fields of underwater resource exploitation,robot operation,ocean exploration,etc.As exploitation offshore oil-gas develop gradually to the deep sea,there are higher requirements on the performance of the submarine cables,in which the spiral wound tensile steel wire plays the role of resisting the axial tensile load.At present,we are mainly faced with three problems: design of tensile force is too simple,lack of theoretical guidance in armor layer processing technology,and poor accuracy of tension control for armor machine,which result in low tensile performance of the submarine cables.Therefore,this paper studies these three aspects to provide reference for the localization of high tensile submarine cable.Firstly,in the terms of the design breaking force design for of submarine cable,because the material nonlinearity and geometrical nonlinearity that caused by the radial shrinkage of the core will greatly affect the theoretical prediction of the ultimate pulling force for the submarine cable,the paper firstly establishes the elastic-plastic numerical model of the submarine cable based on ABAQUS software,meanwhile considering the radial shrinkage of the core and the contact between layers,obtains the ultimate pulling force force of the submarine cable.At the same time,the relevant breaking force test is designed,and the comparative study shows that the error is within 10%,which verifies the correctness of the numerical model.Secondly,in the aspect of winding forming for tensile armor layer of submarine cable,based on the elastic hypothesis and neglecting the friction between equipment and armor wires,this paper establishes a mechanical model of the tensile armor wire to quantify the relationship between the winding tension,angle,radius and the internal force of armor wire cross section during winding forming process.Then based on this model,a method for predicting residual stress of armor wire cross section is presented.At the same time,the process of wire winding is simulated by ABAQUS software and the results show that the error between theoretical prediction and numerical simulation is less 7%,which verify the correctness of the theoretical model.According to this standard,the optimal winding tension is obtained under different cable sizes,which makes the steel wire winding tight and the residual stress minimum.Finally,due to the strong coupling and many interferences of the mechanical model for armored machine tension control system,Hooke's law and moment balance equation are usedto model the tension control system for cabling machine in detail,and The model is a second-order time-delay system which provide reference for the design of tension control system of armored machine.