| Citation: | QIAO Xiaoli, LI Lin, LIU Gongping, et al. Predicate logic based tooling drawing design of aircraft harness[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(9): 1756-1764. doi: 10.13700/j.bh.1001-5965.2020.0343(in Chinese)
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Aimed at the problems of low efficiency and high error rate of aircraft harness tooling drawing design, the core content and predicate logic of each design phase were studied. The Trunk-Branch Tree (TBT) model, which has the characteristics of undirected graph and multi-way tree, was proposed to replace the traditional undirected acyclic graph modeling method. Based on the simulative wiring statistical results, the Large Volume First (LVF) policy was used to realize the auxiliary decision making of the 1-order trunk. The higher-order trunk reasoning, the basic structure reasoning and the best space reasoning based on predicate logic were used to realize the automatic higher-order trunks' decision making, the automatic harness structure design and the automatic space optimization. The harness intelligent process aided design system was developed and used successfully in 12 actual experiments. The tooling drawings can always be designed automatically in 30 seconds, and total design time is no more than 30 minutes for the super-large design drawings with more than 200 edges, excluding the problems of the incorrect 1-order trunk selection and the incorrect edge length. The experimental results show that the design efficiency and reliability are improved significantly by the proposed method.
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