Study On Design And Simulation Analysis Of Hydraulic Heave Compensation Of Ship Crane

The ocean contains rich resources,the process of developing and utilizing marine resources in our country in recent years has been accelerated.The importance of ship crane as an important offshore operation tool is also growing at the same.However,unlike the land-based cranes,the ship cranes will generate heave-motion in the vertical direction under the action of wind,waves and currents,which can not only influence normal lifting operations but also lead to serious safety accidents and the environment pollution.The heave compensation system can compensate for the influence of the ship's heaving motion on the hoist,so that the ship cranes can operate normally under the bad sea condition.However,the heave compensation system specially designed for marine cranes has not appeared in our country.Therefore,it is of great economic and social significance to carry out the research on the heave compensation system specially designed for ship cranes.This paper firstly introduces the development history and research status of heave compensation technology,then classifies the mainstream compensation schemes and compare the advantages and disadvantages of different compensation schemes.A design scheme of a new kind of compound compensation system specifically for ship cranes is proposed on the base of this.The scheme achieves the purpose of compensation by means of compound compensation cylinder and accumulator,take the advantages of both passive compensation and active compensation,which can meet the compensation requirement of 5 tons of lifting weight under the condition of 4-level sea conditions.Then according to the rated conditions,the compound compensation cylinder,accumulator and main pump are calculated and selected.After determining the main structural parameters of the compound compensation cylinder,uses SolidWorks to build its three-dimensional model.Then the finite element analysis of the compound compensation cylinder was carried out by ANSYS.The results show that the cylinder can meet the strength requirements under rated conditions and has great potential for optimization.Therefore,continue to use the ANSYS Response Surface Optimization module to optimize the parameters which can influence the performance of cylinder to determine the final structure parameters of it.Finally,AMESim is used to establish the model of compound heave compensation system.The influence of ship heave motion on the hoist is simulated by the lateral movement of the movable sheave,then the compensation effect of the system is simulated.The results show that the compound heave compensation system designed in this paper can compensate for the heave motion of the ship by 85%,achieved a good compensation effect.