Abstract: In order to solve the problem of complex operation in 3D virtual maintenance training, a
general data format of disassembly and assembly relation was proposed, and the data processing
method was realized, which could be used to customize training application for various equipments
easily. A simple and efficient disassembly operation method was presented, which has automatic shaft
alignment constraint, and a 2D screen space dragger was designed and realized based on that. A 3D
virtual maintenance training simulation system was developed, and the virtual scene was rendered and
managed through OpenSceneGraph (OSG) engine, which architecture and scene organization were
analyzed. The disassembly operation record and report output were realized. The application results
show that this system has good performance on real-time and 3D display effect.

Key words: virtual maintenance training, 3D visual simulation, disassembly and assembly relation;
shaft alignment constraint