Authors

Abstract

The problem of long design cycle, low efficiency and poor knowledge reusability still exists in China, in the process of agricultural machinery design. The reuse retrieval method designed for agricultural equipment CAD model is proposed to improve agricultural machinery digital design. Since agricultural machinery CAD model has internal coupling and local similarity attributes resulting in low performance of general retrieval methods, the Monte-Carlo light simulation method is utilized to extract CAD model partial features. Firstly, the light propagation process in different mediums was quantitatively analysed with optical parameters. Then how light propagates in complex agricultural CAD model was simulated according to Monte-Carlo method. After that the CAD model feature could be extracted with partial propagation information for design reuse retrieval. Finally, the proposed reuse retrieval method was evaluated on retrieval precision, recall and E-measure with particular agricultural model dataset. The results showed that the accuracy of proposed method was higher than that of general model retrieval approaches. Sphere constrained space and 10000 photon packets were shown to be the optimal feature extraction parameters for agricultural CAD model. The final design application results indicated that the proposed method could particularly satisfy agricultural CAD rapid design requirement, which is more suitable for offline complex agriculture CAD model retrieval. This paper is expected to provide a fine-grained, intelligent and visual method for agricultural machinery CAD management, promoting automatic and intelligent design of agricultural machinery manufacturing industry.

Abstract in Chinese

针对农业机械设计过程中设计周期长、效率低、可继承性差等问题，提出一种针对农机装备的重用检索方法。农业机械CAD模型的内部耦合性与局部相似性导致通用检索方法不能满足农机模型检索需求，本文使用蒙特卡罗法提取农机CAD模型局部特征以提高农业机械设计重用水平。首先，利用光学特性参数量化分析光传播特性，使用蒙特卡罗法模拟光在农机CAD模型中传播过程，然后对光传播特征信息统计分析，完成农机模型特征提取，最终在农机模型库中使用多种重用检索评价标准检测特征提取效果。结果表明：本文提出的方法在检索精度方面高于通用模型检索方法；对于农机CAD模型，球形约束空间以及10000光子束是最优特征提取参数；该方法能够满足农业机械快速重用设计需求，更适合于离线检索重用。光传播模拟法是一种具有细粒度、智能化和可视化的检索重用新方法，为提高农机制造业的设计自动化和智能化水平增添新动力