Research On Constraint Load And Response Of Vehicles On Sailing Ship

The great development of the ship transportation industry has led to the continuous development of large-scale and differentiated ships and cargo on decks,and subsequently led to frequent ship overturns due to the problem of securing cargo on decks during ship voyages.,Causing major losses such as damage to the hull structure and the safety of personnel and property.Therefore,carrying out research on the safety of ship deck cargo securing and clarifying the changes in the load of securing ropes with ship movement are of great significance to the development of cargo securing plan design and subsequent optimization,and to ensure the safety of ship transportation.Based on the research background of vehicle securing on ship deck,this thesis uses a combination of theoretical analysis and numerical simulation to study the security of vehicle securing under typical rolling sea conditions during ship navigation,and establishes a fast analytical prediction method for securing rope force.Combining multi-body dynamics numerical simulation analysis technology to verify the similarity of cargo securing models,laying a foundation for subsequent scale model tests,and studying the influence laws of different motion conditions,different securing forms,and different model parameter settings.Provide reference for the design of cargo securing plan for sailing ships.The main research contents of the thesis are as follows:(1)Summarize and sort out the research status and research methods at home and abroad on ship overturning accidents and the stability of ship deck cargo securing,and clarify the research significance and main research content of the thesis.(2)The multi-body dynamics theory and the basic algorithms and theoretical formulas commonly used in ADAMS software are sorted out.Based on the similarity theorem,the dimensional analysis method is used to derive the similarity rate of the overall structure of ship deck cargo securing,which is the design and test of the scale model test.Carry out and provide theoretical basis.(3)Based on the theory of mechanics and kinematics,starting from the simple two-dimensional plane cargo securing form,the theoretical formula for the load-carrying capacity of the cargo securing tie rope is derived,and then extended to the three-dimensional space complex multiple tie rope securing,using The simulation software ADAMS conducts modeling and simulation on the cargo securing model,and compares and analyzes with the theoretical calculation results,which verifies the rationality of the theoretical analysis technology and numerical simulation,and lays the foundation for the subsequent simulation analysis of the vehicle securing model.(4)Carry out research on the securing safety of ship deck vehicles under typical rolling sea conditions.Based on the background of ship deck vehicle securing,and based on numerical simulation modeling technology,the effects of different motion conditions,different securing methods,and different securing parameter settings on the force of securing ropes are simulated and analyzed based on the numerical simulation analysis.As a result,the load-bearing response of the lashing rope under typical motion conditions is analyzed,and the influence of factors such as the pre-tightening force of the lashing rope,stiffness,ship motion cycle,roll angle and other factors on the lashing force is discussed.(5)Carry out scale model test design.Investigate the development of multi-degree-of-freedom swing test rigs at home and abroad and the current situation of securing model test simulation.Based on the derived similarity criterion relationship,the multi-body dynamics analysis software ADAMS is used to input and construct parameters such as dimensions of the full-scale and scaled-scale models.Simulation calculations verified the accuracy of the similar scale and scale relationship,and determined the preliminary test design plan for the three-degree-of-freedom rocking test bench to simulate the ship’s roll,pitch and heave motions,which laid the foundation for the subsequent experiments.