Research On Virtual Assembly Scene Process Of Aircrafts And Its Key Technologies

Because the design and manufacturing technology of domestic aviation,especially aircraft assembly technology is relatively backward, based on virtualassembly technology、computer-aided process Planning at home and abroad, aroundthe aircraft virtual assembly scene process, the paper researches and implements thevisualization virtual assembly scene process design based on three-dimensionalCAD——virtual assembly scene process system of aircrafts, and its keytechnologies are studied. Its main contents are:(1) Data model of virtual assembly scene process of aircrafts is studied, the PPRdata model based on hierarchy is proposed, the time scene model is defined.According to analyzing data receiving feature of assembly scene process of aircrafts,receiving the data quickly, efficiently and accurately is achieved. Comparativelyanalyzing the deficiencies of traditional two-dimensional AO (Assembly Outline)three-dimensional AO is developed, and its method is given.(2) Researching on the neutral information model creation techniques of XML,the virtual assembly process information model of aircrafts is created, and accordingto its feature, aircraft assembly scene process information model integration platformis proposed and developed. By means of the platform, the information exchangebetween its subsystems or with other systems is effectively realized.(3) With regard to the control requirements of assembly scene process ofaircrafts, taken human-computer interaction of three-dimensional mouse as anexample, human-computer interaction based on Virtools is realized; taken imagingwith stereoscopic glasses as the case, the virtual scene stereoscopic display isrealized. Learning from NC Code, this paper designs and implements a kind ofvirtual descriptive language—V Code and its corresponding function. By means of VCode, it is very easy to set up virtual scenes and assembly structure, to editequipment simulation motion program, flexible to control the simulation process, and effective to enhance the structural simulation program and to improve theefficiency of the implementation process.(4) Using XML, the structure of the assembly scene process files based onMBD (Model Based Definition) is constructed. According to virtual assembly scenedata conversion problems at present between CAD system and integrated virtualassembly environment, information extraction&model conversion method is putforward. The lightweight technology of assembly scene is studied. By converting the3D CATIA model files into3D XML files, the assembly scene is lightweighted. Bydoing this, the simulation data is very small, and the simulation has goodperformance in rich scene. It can be embedded in process file and uploaded to thePDM (Product Data Management) system for remote view and production guidance.(5) The target of virtual assembly scene process system of aircrafts is defined,the system software and hardware solutions is put forward, the overall systemprogram based on C/S (Client/Server) infrastructure is constructed, and functionconstruction and architecture design of the system is proposed.(6) By means of DELMIA, WEB development platform based on the HTMLscripting language and XML language development system to develop system, weachieved the virtual assembly scene process system of aircrafts, which can beintegrated with PDM system successfully. At last, an example of assembly on thecomponent of rear beam of horizontal stabilizer of aircrafts of Shanghai AircraftCorporation is given, and the result is proved to be effective.