Research on module fixture assembly database in VR

Virtual reality technology provides an effective method to assembly module fixture.Because of universal and nor-mative characteristic of module fixture,marked method can be the base of precise position and assembly relation.As the ge-ometry assembly relation base of the fixture module in VR,mark is built on the function surface,and oriented the fixture based on the mark.The system manages the database as three layers:part,subassembly and instance,and the restriction rela-tion is built on the base of mark.Using the mark,design efficiency is improved and design knowledge and experience can be saved and reused.A example is used in virtual assembly sysyem.