Research And Realization Of Key Technologies Of Hull Block Lifting Process Design System

With the rapid development of the shipbuilding industry,block lifting is faced with more difficulties due to the increasing scale and more complex structure of blocks.Therefore,the scientificity and safety of lifting technology design are particularly important.At present,the lifting technology design cannot be fully automated,which mainly depends on the experience of designers.There are limitations such as heavy workload,low efficiency and low reliability.In order to improve the intelligence of lifting process design,the thesis proposes a research method for the automatic design of large-scale ship blocks complex lifting process.The main research contents are as follows:(1)The research on block division and grouping principles based on the adaptability of block lifting.From the perspective of block lifting technology,the existing block division principles and grouping schemes are supplemented and optimized.Based on the consideration of sectional adaptability,the grouping scheme due to block geometry and weight characteristics is summarized,which lays the foundation for subsequent researches.(2)The process design of the horizontal lifting of the hull block is researched and the corresponding optimization model is established for the lifting-eye layout problem of the block lifting.First,the lifting process of typical hull block is analyzed,and the horizontal lifting process is optimized in combination with the supplemented section division principle,which provides a connection point for the improvement and adjustment of the subsequent plan.Then the main objects such as hull block structure,lifting equipment and lifting eyes are parametrically expressed,and two objective functions of uniformity and dispersion of lifting points are constructed.Based on various conditional constraints of lifting safety,constraints such as geometric constraints,mechanical constraints,process constraints are extracted and summarized,and so forth,a constraint cluster is integrated to establish a multi-objective optimization model of the lifting point arrangement.The particle swarm optimization algorithm has the advantages of fast convergence.The solution analysis is carried out,and the basic principles of the particle swarm algorithm and the solution process are explained.(3)The process design of the complex block lifting schemes,and the interfering detection method of the block turning over plan.A relatively complicated turnover operation is required during the lifting process of the ship section using the side-building method and the counterbuilding method.First,the process characteristics of the hull section turnover are illustrated,and then the process design method of the block turnover scheme is proposed.The interference problem in the turnover process is analyzed with emphasis.The interference problem between the hull parts and the lifting rope is regarded as a collision problem between a rectangular plane and line.In order to solve this,the lifting ropes and components are parameterized to establish an interference judgment model,and the interference dynamic detection method and the lifting rope adjustment plan are proposed.(4)The research on the safety evaluation method of ship lifting technology based on parameterization.In order to increase the efficiency of finite element analysis of the structural strength of the block lifting process,a parametric method is introduced in the establishment of the block lifting finite element model.First,perform Ansys to rapidly model the block model data extracted from the Tribon system,and then express key information,such as lifting-eye structure,lifting points,and working conditions,with parametric so as to accomplish rapid modeling of the block lifting technology.Taking a certain double bottom block as an example,the process of parametric finite element modeling and calculation of structural strength for its horizontal lifting and turnover is proved convenient and efficient.The parameterized method improves the efficiency of block lifting strength calculation.(5)The Research on the development of the visual design software of hull block lifting.Requirement analysis of the intelligent design system for lifting technology is proposed.The software system is required to complete functions such as dynamic simulation of lifting operations,interactive viewing of block lifting schemes,autonomy of lifting software,and rapid transfer of hoisting operations,so as to realize the efficient transfer of information between the designers and construction workers.Then,the visual design of the hull block lifting is proposed.Based on the existing construction mode,the three-dimensional operation guidance process of the block lifting is formed and the information of the block lifting operation is summarized.The reconstruction method of the hull data model is explained,and the technical principles of data extraction and reconstruction of the flat plate and curved plate from the Tribon system are explained respectively.The functional design of the lifting simulation module includes automated modeling,dynamic simulation,interference detection,and force analysis.It can highly simulate the lifting process and perform real-time interference detection and force analysis.Finally,the overall technical scheme for software function integration is introduced,including four aspects: main object modeling and model import,process scheme design,lifting process simulation,and safety assessment.