Serial plates are not reasonable in material saving and stress dispersion. To design orthopedic plates quickly and conveniently, a method to optimize plates through editing semantic parameters based on average bone model was proposed. Firstly, for reasonable distribution of serial plates in number and size, an average bone model with weights was created from the exiting bones. Secondly, a common orthopedic plate with semantic parameters was constructed based on average bone model and it could be conveniently modified and optimized. Finally, the thickness of the plate was optimized through finite element analysis and bisection strategy to meet the stress condition and use the least material. The experimental results show that the volume of the optimized femur clover plate and the Ⅲ type of the plate for distal femur is decreased by 2.7% and 12.2%, and the maximum stress is decreased by 56.9% and 24.4% respectively. Experimental results indicate that the proposed method can save material and disperse the stress of plates to effectively construct and optimize the orthopedic plates.

Concerning the problem of managing components information in the process of three-dimensional presentation of virtual assembly, a design of integrating 3-D visualization and information management technology combined with electric vehicles assembling and disassembling was proposed. Firstly, 3D model and information library were established according to the topology and supporting information of electric vehicles such as material and type. Secondly, a directory tree was created based on the parent-child relationship between the parts and sub-assemblies from information library, and three-dimensional presentation of the sub-assembly was achieved according to the principle that sub-assembly and scene tree have the same structure of "multi-tree", each node of the sub-assembly was animated before disassembly presentation. Finally, pickup interactive query and retrieving location query were achieved by combining the information management and visualization of electric vehicle. The constructed system was verified by century bird electric bicycle models, the integration of 3-D visualization and virtual assembly was realized, which could provide technical support for 3-D presentation and virtual assembly effectively. The experimental results show that the constructed system can effectively integrate the 3-D visualization and information management of components in virtual assembly.