Research Papers

A Localization Algorithm for Improving Fabrication of Curved Hull Plates in Shipbuilding

[+] Author and Article Information
Jung Seo Park

Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul 151-742, Koreaemot97@snu.ac.kr

Jong Gye Shin

 Research Institute of Marine Systems Engineering, Seoul 151-742, Koreajgshin@snu.ac.kr

Chung Min Hyun

 SAMSUNG Heavy Industries Co., Ltd, Geoje 656-710, Koreacm.hyun@samsung.com

Young Chil Doh

 SAMSUNG Heavy Industries Co., Ltd, Geoje 656-710, Koreayoungchil.doh@samsung.com

Kwang Hee Ko1

Department of Mechatronics, Gwangju Institute of Science and Technology, Gwangju 500-712, Koreakhko@gist.ac.kr


Corresponding author.

J. Manuf. Sci. Eng 130(4), 041013 (Jul 17, 2008) (8 pages) doi:10.1115/1.2953232 History: Received November 13, 2007; Revised April 30, 2008; Published July 17, 2008

In this paper, a localization method is proposed for improving the curved plate fabrication process. In the curved plate forming, checking the similarity of a manufactured plate to a CAD model is a critical step, which can be done by aligning the manufactured plate to the CAD model. Although there exist several localization methods, they may not be suitable for the curved plate forming since they do not consider production efficiency (the shortest cutting length for trimming margin) for the subsequent assembly process. Therefore, in this work, a constraint for minimizing the cutting length is introduced in the localization scheme and an algorithm is proposed to handle the problem. A manufactured plate is measured and a constraint is imposed on the reference points of a CAD model and the measured points to limit the direction of the movement of the measured points in the solution process. Through this algorithm, the CAD model and the measured points are aligned such that the shortest cutting length is obtained. After the alignment, the cutting lines are computed for marking on the manufactured plate. Various curved plates taken from the real ship manufacturing process are used to demonstrate the performance of the proposed algorithm.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

A wooden template and a curved plate

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Figure 2

Two possible alignment cases. The small plates in black indicate the design plates.

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Figure 3

Two supporting types: wooden supports and dogs (1)

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Figure 4

Two possible localization cases: (a) The reference point is fixed. (b) A gap is imposed at the reference point.

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Figure 5

Orthogonal projection of a curve onto a surface

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Figure 6

Three possible cases of alignment for the design and the measured surfaces

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Figure 15

Cutting curves on the measured plate

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Figure 7

The results of alignment of three curved plates obtained from the curved plate forming process at a shipyard

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Figure 8

Computed heating curves before heating (left) and a plate after heating (right)

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Figure 9

Localization with a reference point

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Figure 10

Optimal localization

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Figure 11

Constrained localization at the reference point

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Figure 12

The manufactured plate

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Figure 13

Localization results: (a) optimal localization, and (b) constrained localization. The corner in the circle is the reference point for the constrained localization.

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Figure 14

A designed CAD surface and a measured surface with measured points



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