Design Of Wave Compensation System For Riprap Ship

Offshore wind farms and deepwater oil and gas development regardless of the development mode,submarine pipelines,umbilical cables,cables and other structures are their important underwater facilities,uneven seabed,unstable geological conditions and other factors will bring safety hazards to underwater facilities,rock throwing operations on underwater structures is one of the effective measures to solve such problems.However,due to the harsh marine environment,the rock throwing vessel and the rock throwing equipment on the ship’s surface will be affected by wind,waves,currents and surges,resulting in movement and position changes such as transverse rocking,longitudinal rocking and vertical swinging,among which the transverse rocking has a particularly obvious impact on the accuracy of the rock throwing funnel tube,and may even affect the safety of the rock throwing vessel and the marine environment,so a wave compensation system is needed to compensate for the waves of the rock throwing equipment.Considering that most domestic rock throwing vessels do not have wave compensation function,it is of great engineering significance to carry out research on wave compensation system for rock throwing equipment.This paper firstly introduces the development process of wave compensation technology and the current status of domestic and foreign research,explores different compensation schemes,analyzes and compares the advantages and disadvantages of different compensation schemes,and proposes a new composite wave compensation system scheme for rock throwing system of rock throwing vessel based on it.This scheme uses a combination of applied active and passive compensation,which combines the advantages of both compensation methods and can meet the ultimate purpose of stabilizing the rock throwing pipe in rock throwing operation.Secondly,according to the wave compensation design scheme,the selection and calculation design of the important hydraulic components inside the wave compensation system are carried out,and the 3D model of the structure of the wave compensation system is established based on the selection results.By analyzing the time domain load of the important hydraulic components in the wave compensation system under different operating modes,and using the finite element analysis method to verify the structural rationality of the important hydraulic components.Combining the maximum stress-strain of the hydraulic components of the cylinder,the response surface method is applied to optimize the dimensions of the hydraulic components.Finally,based on AMESim platform,the hydraulic module,motion module,control module and environment module of the composite wave compensation system are integrated and built,and the wave compensation effect of the composite wave compensation system is simulated and analyzed with the actual engineering parameters,and the compensation effect of the composite wave compensation system is compared under different operating modes,and the influence of the working volume of the accumulator on the energy saving of the system and the influence of the number of hydraulic variable pumps on the compensation effect of the wave compensation system are verified,and the optimal solution of the number of hydraulic variable pumps of the system is determined.