The Simulation Research Of Anti-Sway Structure System Of Straight Arm Crane

China’s marine engineering has become increasingly important with the development of economy and technology.In view of the demand for anti-sway structure of the "Sea Patrol 1640" crane,the pallet-rope type of anti-sway crane is studied in this paper.Preliminary design and geometric modeling based on the size data of the navigation vessel are presented.The virtual prototyping technology is used to simulate the anti-sway system.The swinging motion of the hoisting system is simultaneously affected by the wave motion and the ship movement.It mainly considers the rolling and pitching motions of ships under regular waves,analyzes the action mechanism of ship motions on the hoisting system,and derives the ship’s motion excitation function.In order to meet actual engineering needs,a weighing structure that can dynamically recognize the quality of objects in wave environment is designed based on structural parameter identification.The feasibility of the structure has been verified through calculation examples.In view of the motion characteristics of the lifting swaying system,the Lagrange analysis mechanics is used to deduce the dynamic equation.The mathematical modeling of differential equation for lifting weight movement is completed by using block diagram tool in Simulink.Set different initial angular velocities to simulate different wave conditions.By comparing the range of the motion trajectory of the lifting system between the situations that the ship is equipped with the anti-sway structure and the other is not,the feasibility of anti-sway of the structure is verified by MATLAB.Further study of the anti-sway ability and mechanical behavior of the anti-sway structure for ship cranes in ADAMS software and optimize the structure.Taking into account the different position and posture of the crane jib,through simulation analysis,determine the appropriate size of the boom.Simulate different marine conditions by using different combined excitation functions,and then study the anti-sway ability and mechanical properties of the optimized anti-sway system.The trajectory of lifting weight,the pendulum angle of buoy and the rope tension are investigated as the evaluation index.Design a box structure crane arm in Workbench.The finite element analysis of the hoist arm is carried out by using the dynamic load data of the rope to the hanger.On the premise of satisfying the requirements of strength and stiffness,based on the lightweight design of the boom,the section size of the hoist arm is optimized and the quality of the hoist arm is effectively reduced.