| For large-scale equipment such as satellite load subsystems,the assembly process planning is extremely complicated,and it is also full of difficulties and challenges.Operational norms and efficiency in a complex assembly environment largely determine the final quality,cycle and cost.With the emergence of virtual reality technology,various problems faced have been effectively solved.In the course of the research,this thesis focuses on the basic technology and design method of the virtual assembly process according to various problems faced during the production of satellite assembly,and conducts in-depth discussion and research on this.This thesis mainly introduces the basic characteristics and contents of traditional assembly process design,analyzes various problems arising from the design of satellite load sub-system assembly process design,and clarifies the future research direction.Based on this,the corresponding workflow and architecture are proposed.From the functional level,the system can be divided into the following parts,including physical model collection,virtual assembly sequence planning,process information generation and demonstration.In the virtual reality environment,the research focuses on 3D model conversion technology.Based on the analysis of related information and requirements,based on the hierarchical constraint structure,a corresponding virtual assembly model is proposed,and the product information is divided into product layers,component layers,part layers,feature layers,geometric surface layers,and patch layers to express.And the constraint relationship between the elements of each layer is established to realize the data conversion from the 3D model to the virtual reality environment.The assembly sequence planning in virtual reality environment is studied.In the course of the research,this thesis uses a combination of intelligent assembly sequence reasoning and interactive assembly planning evaluation.The basic concept of the priority constraint table was expounded,and the priority constraint relationship of the assembly was fully expressed.Based on the initial optimization of the assembly sequence as a guide,in the virtual reality environment,interactive assembly planning,evaluation and simulation operations are realized.With the help of human knowledge and work experience,we are committed to generating new priority constraints and evaluation criteria.Optimal assembly sequence.The process information generated in the process of virtual assembly is organized and expressed effectively,and the process directory tree of the product is obtained.WebGL technology is used to browse and demonstrate assembly information. |
