Ship hull plate processing surface fairing with constraints based on B-spline

2005 ◽  
Vol 4 (3) ◽  
pp. 13-17 ◽  
Author(s):  
Liu Yu-jun ◽  
Zhu Xiu-li ◽  
Ji Zhuo-shang
Keyword(s):  
Ship Hull ◽  
B Spline ◽  
Ship Hull Plate

scholarly journals Development of Support System for Ship-Hull Plate Forming Using Laser Scanner

2021 ◽  
Vol 15 (3) ◽  
pp. 290-300
Author(s):  
Masahito Takezawa ◽  
◽  
Kohei Matsuo ◽  
Takahiro Ando
Keyword(s):  
Point Cloud ◽  
Laser Scanner ◽  
Target Surface ◽  
Ship Hull ◽  
B Spline ◽  
Spline Surface ◽  
Lines Of Curvature ◽  
Plate Shape ◽  
The Difference ◽  
Ship Hull Plate

In this study, we developed a new system that outputs the additional press work procedures necessary to obtain the desired ship-hull surface. This study is unique in terms of determining the additional press work procedures required according to the current plate shape at any work stage by measuring the plate shape using a laser scanner. In the proposed method, a B-spline surface is constructed from a point cloud measured using a laser scanner, and the current plate shape is analyzed based on differential geometry. Additional press lines are estimated based on the difference in the normal curvature along the lines of curvature between the designed target surface and the current surface. We demonstrated the effectiveness of our proposed method through experiments at a shipyard. The proposed system may be used to enhance the efficiency of press work and is expected to be an effective tool for training beginners in the future.

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 Influence of curve fitting techniques on hydrostatic characteristics of ship

1970 ◽  
Vol 39 (2) ◽  
pp. 100-112
Author(s):  
Md Mashud Karim ◽  
Md Ashim Ali ◽  
Kho. Sahriar Iqbal
Keyword(s):  
Curve Fitting ◽  
Mechanical Engineering ◽  
Cubic Spline ◽  
Ship Hull ◽  
Least Square ◽  
Ship Stability ◽  
Hull Form ◽  
B Spline ◽  
Using Data ◽  
Table Data

This paper presents influence of curve fitting techniques on hydrostatic characteristics of marine vessels.  Three vessels having lengths of 32.16m, 70.0m and 25.6m are selected for this study. The hull geometries of these vessels are represented by three curve fitting techniques such as least square, cubic spline and B-spline methods. At first, hydrostatic characteristics of the vessels are calculated using data only available in offset table and then using more data generated by curve fitting techniques. Finally, results obtained by offset table data are compared to those by fitted data. It is seen that there are some influences of curve fitting technique on the hydrostatic characteristics of ship especially at lightly loaded condition. Keywords: Curve fitting technique, ship hull form, offset table, hydrostatic characteristics, ship stability, cross curve. doi:10.3329/jme.v39i2.1853 Journal of Mechanical Engineering, Vol. ME39, No. 2, Dec. 2008 100-112

scholarly journals A Study on Two-Dimensional Forming of Ship Hull Plate by Geometrical Approach

2009 ◽  
Vol 27 (2) ◽  
pp. 32-37
Author(s):  
Woo-Jae Seong ◽  
Jun-Su Ahn ◽  
Hyun-Uk Kim ◽  
Suck-Joo Na
Keyword(s):  
Ship Hull ◽  
Geometrical Approach ◽  
Two Dimensional ◽  
Ship Hull Plate
Sign in / Sign up

Export Citation Format

Share Document