面向数字化技术支援的数字样机逐层轻量化技术

直观的三维模型有助于提高民用飞机远程维修支援的效率和准确度，但由于计算机辅助设计系统产生的模型数据量通常比较巨大，三维数字样机的轻量化成为了很大的挑战.基于对格式转换与模型简化这两种轻量化方法的分析，提出了基于单元数据量的数字样机逐级轻量化的方法，将全机的三维模型进行不同简化程度的轻量化处理，并且提出了基于失真度判据的层级化管理方法，按照模型结构树对简化率高的失真模型与具有细节特征的无损模型进行逐级的加载与使用.实例验证表明所提出的方法有效减小了网络传输的数据量并保留了模型必要的细节特征，使在互联网中快速访问全机三维模型得以实现.

Gradual lightweight method of three dimensional prototypes for digital technical support

Intuitionistic three dimensional (3D) models can improve the efficiency and accuracy of civil airliner's distant maintenance support, but due to the fact that models' data size generated in computer aided design systems is usually quite huge, it is a sever challenge to make a lightweight 3D digital prototype. Based on the analysis of two lightweight ways, i.e., model format transformation and model simplification, a gradual lightweight method for digital prototype based on unit data size was proposed, which progressively simplify the 3D model of a whole plane into many different simplification levels, and a hierarchical management methods based on distortion criterion was proposed, which progressively load and use distortion model with high reduction rate and undamage model with detail characteristics according to model structure tree. An example shows that these methods can effectively reduce data size for network transmission and preserve necessary detail characteristics of the model, so that quick access to 3D model of a whole plane via internet can be realized.