Analysis Of Dynamic Response Characteristics Of Moored Objects On Marine Floating Platform And Research On Mooring Layout Optimization

Under severe marine environmental conditions,due to the violent shaking motion of the marine floating platform,the mooring device used to fasten non-fixed equipment,vehicles and other moored objects on the platform will bear a huge load.If the mooring load is unevenly distributed,The mooring structure on one side will be overloaded,and there is a risk of damage and failure.In order to solve the problem of the safe parking of the moored objects on the marine floating platform,it is necessary to build a true and reliable mooring model to calculate the mooring load,and to achieve a reasonable layout of the mooring distribution through optimization methods.Consequently,the research on the above research goals is carried out in this article.Firstly,based on the hydrodynamic software AQWA,a ship-type platform is used as the research object,and the hydrodynamic performance of the ship-type platform is analyzed by calculating the amplitude response operator and hydrodynamic parameters under different wave directions and different wave frequencies.The wave direction and wave frequency corresponding to the maximum motion response of the ship-shaped platform are determined.On the basis of the above calculations,in order to simulate the motion of the hull under actual sea conditions,by introducing the JONS WAP wave spectrum,the frequency domain and time domain motion responses of the ship platform under irregular waves are obtained.Secondly,in order to solve the mooring response,a mechanical model of mooring with six mooring riggings is constructed,and the spatial force equation is established according to the D’ Alembert principle,and calculation method of the inertial force and gravity of the moored body after the coordinate system transformation are given.At the same time,a parametric mooring model is established based on the multi-body kinematics software ADAMS.Driven by the time-domain stochastic motion curve of the hull platform,the mooring response under the action of irregular waves is calculated,and the influence of the spatial distribution of the mooring bases,preload and external load on the mooring response is analyzed.From the result,it can be seen that the angle of the mooring cable and the direction of the wind have a greater influence on the distribution of the mooring response.Then,using the method of finite element analysis,the structural strength of the mooring device is checked.In addition,in order to find the optimal solution of the mooring seats layout,a discrete variable genetic algorithm in the form of integer coding is written,and the optimization process is realized by writing it into a modeling simulation script written by a macro command.The calculation examples show that the maximum mooring load is greatly reduced after optimization.Finally,the mooring load calculation software platform is developed based on the C#.net platform,which can realize the functions of rapid modeling,simulation and optimization of the mooring model.