Hydrodynamic Dynamic Response Of Aquare Barge Based On Protrction Of Floating Energy Dissipation And Anti-virbation Device

In offshore construction,large square construction barge is very important for lifting and sinking operation ships,such as large offshore wind farms and subsea submerged tube tunnels and other ocean engineering projects.Offshore construction will inevitably face complex and unstable marine wave-current environment,and excessive hull shaking will affect the accuracy and safety of construction.The frequency of disasters and damage caused by excessive wave-current loads are at the front of all kinds of marine disasters and accidents.How to ensure the stability of barge in construction operation stage?It is one of the keys to ensure the smooth progress of offshore construction.In this paper,a new protection method of setting floating energy dissipation and anti-vibration device to protect square barge is proposed,and the expected wave attenuation and current reduction mechanism of the protection device is expounded.The wave attenuation and current reduction capability of the device is explored through physical model test.Then the hydrodynamic response of a square barge protected by a floating energy dissipation and antivibration device under the action of wave and current is studied and the influence of wave and current sensitivity on the hydrodynamic response of the square barge is analyzed.Finally,the protection effect of floating energy dissipation and vibration suppression device on square barge is studied by finite element numerical simulation.The conclusions are as follows:(1)In this study,a method of using floating energy dissipation and vibration suppression device to protect square barge is proposed.In order to analyze the performance of wave dissipation and current reduction of the protection device,four comparison models are designed and the flume model tests are carried out.The test results show that the proposed protection device structure type D has the strongest wave-current capacity reduction performance,which can reduce the regular wave height by 80% and the uniform current velocity by 89%.(2)An experimental study on hydrodynamic response of a square barge protected by a floating energy dissipation and vibration suppression device was carried out to study the effects of different wave and current parameters on hydrodynamic response of the square barge.The test results show that the dynamic response of the square barge is significantly reduced under the protection of the floating energy dissipation and anti-vibration device,and its roll,heave,roll and relative cable force are reduced nearly 10 times,8 times,12 times and 5 times.(3)The experimental optimization of initial parameters of different square barges with protection methods is carried out,and some engineering suggestions are given: in the actual construction of square barges,the best and economic protection effect of the protection method in this paper can be achieved by increasing the freeboard value of square barges,setting appropriate protection spacing and adjusting appropriate mooring system tension.(4)The dynamic response numerical analysis model of the protection device and the square barge was established by CEL analysis method in the finite element software ABAQUS,and the sensitivity analysis of key wave and current parameters was carried out.Combined with the analysis results of numerical model and physical test,the floating energy dissipation and vibration suppression device can effectively reduce the motion response of the square barge,and the protection method proposed in this paper can ensure the safety and stability of the square barge in practical construction.