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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.
Intuitive three-dimensional models help to improve the efficiency and accuracy of long-distance maintenance support for civil aircraft, but due to the relatively large amount of model data generated by computer-aided design systems, the lightweight three-dimensional digital prototype has become a big challenge.Based on the analysis of the format Transformation and simplification of the two models of light-weight analysis of the method proposed based on the amount of unit data volume digital light-level method of gradual reduction of the whole three-dimensional model of the machine to simplify the degree of lightweight processing and proposed based on the degree of distortion Criterion hierarchical management method, according to the model tree, the simplified and high-rate distortion model and the detail-less lossless model are loaded and used step by step.The example verification shows that the proposed method effectively reduces the amount of data transmitted by the network And retains the necessary details of the characteristics of the model so that the Internet can quickly access the full three-dimensional model can be achieved.