Research On The Information Technology Of Marine Diesel Engine Assembly Based On Virtual Assembly

The assembly of diesel engine is the last stage in the manufacturing process of diesel engine.The working performance,economy and reliability of diesel engine are affected by assembly quality.In other words,the assembly process has a decisive impact on the product quality.With the progress of industrial information technology,it has become an inevitable trend to apply information technology to the whole assembly process,which includes assembly process information management,assembly process planning and assembly process guidance.The content of assembly process information management of low-speed marine diesel engine is analyzed in this paper.The assembly process information management mode based on virtual assembly is proposed in this paper.The mode applies virtual assembly,web,database and other technologies to the assembly process management of low-speed diesel engine,and it make the whole process from two-dimensional to three-dimensional transformation.In the process information management stage,the assembly process information is analyzed and the assembly process information database is designed.The characteristics of lowspeed diesel engine assembly technology are studied,and the data model and process dictionary of process and data model of process description unit are established.Based on the reusability of assembly process information,a process information editing method based on virtual assembly is proposed to realize the modularization and visualization of process editing.In the process planning stage,the assembly characteristics of the low-speed diesel engine are analyzed,and the automatic assembly sequence planning algorithm based on the improved genetic algorithm and the path planning method based on the path planning principle of hoisting parts are designed.These two methods can generate more reasonable assembly sequence and assembly path automatically according to the information of the three-dimensional model of the diesel engine.Main contents of virtual assembly process consisted of the construction of virtual assembly environment,the simulation of assembly sequence and path,and the analysis of ergonomics are studied.In the stage of assembly process guidance,by using virtual assembly and Internet technology,an interactive electronic process card is designed.The interactive electronic process card can display process information including text description,process drawings,threedimensional models of parts,virtual assembly documents,etc.Workers can get more intuitive assembly guidance through the interactive electronic process card,and they can reflect the situation to the process department as well.According to the requirement analysis of assembly process information management mode based on virtual assembly,The marine diesel engine assembly process information management platform based on B/S is designed,and it developed by using mysql,Apache,PHP,JavaScript,etc.The network operation mode of marine diesel engine assembly process information management platform is established.The interactive interface of assembly process information management module,sequence and path planning module,process information editing module,interactive electronic process card module and assembly process monitoring module is designed.