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Zhou Fang

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Proceedings Article | 27 January 2021 Paper

Disassembly modeling in ship maintenance with consideration of the influence of fasteners

Hua Zhang, Minhao Mu, Zhou Fang, Yue Qiu, Pengxing Yi

Proceedings Volume 11720, 117202P (2021) https://doi.org/10.1117/12.2589423

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Disassembly sequence planning is an important part of maintenance, and disassembly modeling is the premise of sequence planning. Due to a large number of parts and complex structure, it is difficult to model the disassembly process for ship maintenance. In this paper, we proposed a disassembly modeling method with consideration of the relationship between the general parts and fasteners. At first, we analyzed the disassembly rules of fasteners and the constraints of fasteners, determined the hidden priority relation of part, and established the fastener relation table. At the same time, the relation table of fasteners and the interference matrix of parts were synthesized, and the constraint interference matrix considering the influence of fasteners was established. Based on this proposed modeling method, the judgment criterion of part disassembly and the disassembly rule of fasteners were put forward, and the effectiveness and superiority of the method were illustrated with an application case.

Proceedings Article | 27 January 2021 Paper

Improvement of maintenance visibility analysis method based on the cone of human visual field

Mingyu Li, Minhao Mu, Zhou Fang, Chunhua He, Pengxing Yi

Proceedings Volume 11720, 1172029 (2021) https://doi.org/10.1117/12.2589418

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The article presented an improved visibility evaluation model to make up two shortcomings of the visual cone maintenance visibility analysis method based on the real visual field, which could not quantitatively evaluate visibility and visual field occlusion. Firstly, combining sight distance and volume, we determined the position of objects in-plane field of vision. Then the line of sight model from human eyes to each part of the object was established to determine the occlusion of each part of the object. Finally, the evaluation results were quantified. The redevelop of DELMIA software realized the improved maintenance visibility analysis function module. In the maintenance visibility verification of the welding workstation, the improved method can effectively evaluate the visibility and quantify the evaluation results and quantitatively evaluate the occlusion of objects. The improved method greatly improved the comprehensiveness and rationality of visibility analysis in complex equipment maintenance.

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