Page 422 - Practical Design Ships and Floating Structures

F’ractical Design of Ships and Other Floating Structures 397
You-Sheng Wu, Wei-Cheng Cui and Guo-Jun Zhou (E&)
0 200 I Elsevier Science Ltd. All rights reserved

STUDY ON THE PROCESS TECHNOLOGY FOR LINE HEAT
FORMING OF HULL FABRICATION

LIU Yujun, JI Zhuoshang, WANG Dong, DENG Yanping
School of Naval Archit. And Mar. Eng., Dalian Univ. of Technol., China

ABSTRACT

A simulation method of line heat forming of hull fabrication is proposed in this paper. The calculation
methods of local contraction values for two kinds of complex curved Sail-Shaped plates are introduced.
The mathematical models of the relation between the maximum retraction length and the parameters
acting on the plates are established by theorems of stepwise regression and mathematical statistics. The
Validity of the methods is presented on the basis of experimental data. The optimum design method of
processing technical parameters is also discussed.

KEYWORDS

Shipbuilding, Hull fabrication, Line heat forming, Optimum design, Simulation method.

1 INTRODUCTION

The simulation method of line heat forming presented in this paper has been developed on the basis of
the achievements of the first stage experimental research in China. This study has analyzed the
practical conditions of China’s shipbuilding industry, considered the Characteristics of Chinese
construction techniques, taken the advantages of longstanding co-operation between universities and
shipyards, and made reference of the overseas research experience. The research has been divided into
four stages. In the first stage, the essential local contraction values of the plate deformation, including
contraction area and the maximum contraction length were studied, which are necessary for making
complex developed curved surface from a plane plate. In the second stage, based on the processing
data of ship plates, the mathematical model was established, which describes the relation between the
local contraction value and the processing parameters of flame bending. In the third stage, according to
the technical procedure of line heat forming, the optimal method was applied to determine the
technical parameters in the processing of hull plates of known shapes. In the last stage, the feedback