The Surface Deformation Prediction of Ship-Hull Plate for Line Heating

2016 ◽  
pp. 827-839
Author(s):  
Liang Qi ◽  
Feng Yu ◽  
Junjie Song ◽  
Xian Zhao
Keyword(s):  
Surface Deformation ◽  
Ship Hull ◽  
Line Heating ◽  
Deformation Prediction ◽  
Ship Hull Plate

Curvature Analysis Method for Ship-Hull Plate Forming

2005 ◽  
Vol 21 (02) ◽  
pp. 65-72
Author(s):  
Zhang Xuebiao ◽  
Ji Zhuoshang ◽  
Liu Yujun
Keyword(s):  
Principal Curvature ◽  
Ship Hull ◽  
Analysis Method ◽  
Principal Curvatures ◽  
Line Heating ◽  
Bending Angle ◽  
Curvature Analysis ◽  
Curvature Distribution ◽  
Ship Hull Plate ◽  
Adjustment Of Parameters

Ship-hull plate forming by line heating requires hard and skillful labor. Initially, the plate is curved in one direction by rolling. Then, the curved plate is transported to the line-heating workshop to obtain the required shrinkage. However, this two-step forming leads to a series of problems. This paper presents a method to change the two-step forming into line-heating forming by using curvature analysis. The principal curvatures of the formed plate can be calculated directly from the offset data. The principal curvature distribution provides information on the deformation distribution and the heating lines. Heating along a line will result in a uniform bending angular deformation. A numerical method to determine the heating lines to produce the required bending angle is presented. This kind of heating line does not require adjustment of parameters in line heating. It would benefit temperature control and facilitate plate forming automatically.

scholarly journals Effect of Coil Width on Deformed Shape and Processing Efficiency during Ship Hull Forming by Induction Heating

2018 ◽  
Vol 8 (9) ◽  
pp. 1585 ◽  
Author(s):  
Hongbao Dong ◽  
Yao Zhao ◽  
Hua Yuan
Keyword(s):  
Temperature Field ◽  
Electromagnetic Induction ◽  
Computer Control ◽  
Ship Hull ◽  
Induction Coil ◽  
Control Technology ◽  
Line Heating ◽  
Processing Efficiency ◽  
Ship Hull Plate ◽  
Coil Size

The main hull of a ship is made up of a large number of plates with complex curvatures. Line heating is one of the main approaches used in the forming of a ship hull plate. Because line heating is based on manual heating using a handheld oxyacetylene gun, the typical heating width is extremely narrow. With the development of computer control technology, a newly developed automated plate forming equipment is available and its heat source is typically an electromagnetic induction coil. The temperature field and the induction coil size are correlated. However, investigations into the induction coil size are scarce. In this study, the effect that the induction coil width has on both the forming shape and processing efficiency is investigated via simulation and test. The results show that a moderate expansion of the induction coil width at different input powers has an insignificant impact on forming shapes that is attainable by common line heating. However, as the heating width expands with the expansion of the induction coil width, the number of the processing lines via line heating is reduced which improves the processing efficiency.

scholarly journals Lung surface deformation prediction from spirometry measurement and chest wall surface motion

2016 ◽  
Vol 43 (10) ◽  
pp. 5493-5502 ◽  
Author(s):  
Joubin Nasehi Tehrani ◽  
Alistair McEwan ◽  
Jing Wang
Keyword(s):  
Chest Wall ◽  
Surface Deformation ◽  
Wall Surface ◽  
Deformation Prediction ◽  
Surface Motion

Effects of inductor patterns on temperature and deformation behavior of ship hull plate by induction heating

2018 ◽  
Vol 232 (23) ◽  
pp. 4371-4389
Author(s):  
Shuiming Zhang ◽  
Cungen Liu ◽  
Xuefeng Wang ◽  
Zhi Yang
Keyword(s):  
Induction Heating ◽  
Opposite Direction ◽  
Thermal Deformation ◽  
Transient Analysis ◽  
Ship Hull ◽  
Temperature Dependent ◽  
Thermal Forming ◽  
Ship Hull Plate ◽  
Heating Direction ◽  
Transverse Shrinkage

This paper mainly investigated the effects of different inductor patterns on thermal forming behavior of ship hull plate by moving induction heating. Alternately-coupled electromagnetic-thermal analysis procedure considering temperature-dependent material properties was firstly implemented at each moving step of inductor, followed with uncoupled thermal-mechanical transient analysis to obtain corresponding thermal deformation. Then temperature distribution, dimensions (breadth b and depth h) of heat-affected zone, and deformation obtained from codirectional current-carrying inductor with no gap and opposite-direction current-carrying inductor with gap were compared, respectively. And effects of heating directions and distance T2 of ODIG were also analyzed. It turns out that codirectional current-carrying inductor with no gap can generate much larger transverse shrinkage at 1.8–2.5 mm/s than opposite-direction current-carrying inductor with gap, otherwise smaller at 3.2–4.0 mm/s, likewise larger temperature gradient at 1.8–4.0 mm/s and thus larger bending angular deformation. Besides, heating direction “Out” can generate larger deformation than “In” and deformation for opposite-direction current-carrying inductor with gap can be effectively improved through adjusting distance T2 until 13 mm. These indicate that adopting appropriate inductor patterns, heating direction and distance T2 of opposite-direction current-carrying inductor with gap can significantly improve thermal forming behavior.

scholarly journals Deformation Prediction of Plate Line Rolling Forming Based on Inherent Strain Method

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Changcheng Hu ◽  
Yao Zhao ◽  
Guoyuan Tang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Deformation Prediction ◽  
Automation Equipment ◽  
Inherent Strain ◽  
Inherent Strain Method ◽  
Computing Method ◽  
Ship Hull Plate ◽  
Element Method ◽  
Strain Method

Inherent strain method has been widely used as a forecasting and computing method for welding deformation of large complicated structures and further applied to the research of line heating forming. Mechanical forming is a common ship-hull plate forming method, for which deformation prediction still depends mainly on elastoplastic finite element method. This paper researched the application of inherent strain method to plate line rolling forming, a common mechanical forming method, and then compared the results of inherent strain method and elastoplastic finite element method, proving the applicability of inherent strain method, providing a method for fast, accurate forecasting of distortion in plate line rolling and formation of automation equipment.

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