Abstract
Based on experimental data of line heating, the methods of vector mapping, plane projection, and coordinate converting are presented to establish the spectra for line heating distortion discipline which shows the relationship between process parameters and distortion parameters of line heating. Back-propagation network (BP-net) is used to modify the spectra. Mathematical models for optimizing line heating techniques parameters, which include two-objective functions, are constructed. To convert the multi-objective optimization into a single-objective one, the method of changing weight coefficient is used, and then the individual fitness function is built up. Taking the number of heating lines, distance between the heating lines' border (line space), and shrink quantity of lines as three restrictive conditions, a hierarchy genetic algorithm (HGA) code is established by making use of information provided by the spectra, in which inner coding and outer coding adopt different heredity arithmetic operators in inherent operating. The numerical example shows that the spectra for line heating distortion discipline presented here can provide accurate information required by techniques parameter prediction of line heating process and the technique parameter optimization method based on HGA provided here can obtain good results for hull plate.
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TERASAKI T, MIZUKAMI M. Effect of line heating factors on transverse shrinkage generated by triangle heating [J]. Journal of the Society of Naval Architects of Japan, 2003, 193: 75–83 (in Japanese).
TERASAKI T, YAMAGUCHI K. Study on transverse shrinkage and angular distortion generated by line heating [J]. Journal of the Society of Naval Architects of Japan, 2003, 193: 65–74 (in Japanese).
SHIN J G, LEE J H. Nondimensionalized relationship between heating conditions and residual deformations in the line heating process [J]. Journal of Ship Research, 2002, 46 (4): 229–238.
LIU Yujun, LEI Yuntian, JI Zhuoshang, Dai Yinsheng. Experiment analysis of main parameters of hull plate distortion processed by line heating [J]. Ship & Ocean Engineering, 1998 (6): 28–30 (in Chinese).
ISHIYAMA M, TANGO Y. Advanced line-heating process for hull-steel assembly [J]. Journal of Ship Production, 2000, 16 (2): 121–132.
LIU Yujun, WANG Dong, JI Zhuoshang, DENG Yanping. Optimal design of hull plate processing plan by heat line forming [J]. Journal of Dalian University of Technology, 2000 (2): 207–209 (in Chinese).
MAMMONE R J, ZEEVI Y. Neural networks: theory and applications [M] San Diego: Academic Press Professional Inc, 1991.
CHEN Jingliang. Modern application mathematics handbooks: Moder applied analysis [M]. Beijing: Tsinghua University Press, 1998 (in Chinese).
MASATOSHI Sakawa. Genetic algorithms and fuzzy multiobjective optimization [M]. [S.l.] Kluwer Academic Publishers, 2002 (11): 134–141.
CHAMBERS L. The practical handbook of genetic algorithms [M.] [S1.) CRC press, 2001.
YANG Xiaoqi, TEO K L and LOU C. Optimization methods and applications [M], Kluwer Academic Publishers, 2001.
JIN Shiliang, YU Wenxi, JIANG Chunman. Hull plate outspread method considering process plastic distortion [J]. Ship & Ocean Engineering, 1994 (8): 11–15 (in Chinese).
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Foundation item: Supported by Item of Hi-tech Research and Development Program of China (No. 2001 AA421200).
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Yu-jun, L., Pei-jun, G., Yan-ping, D. et al. Study of automatic designing of line heating technique parameters. J Mar. Sc. Appl. 5, 53–61 (2006). https://doi.org/10.1007/s11804-006-0049-0
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DOI: https://doi.org/10.1007/s11804-006-0049-0