In shipyards hull forming is performed by the line heating method using a gas torch and by cold treatment using a roll-press. However, this forming process has some issues, such as difficulties in controlling and accurately estimating the amount of the heat input, as well as a harsh working environment due to exposure to loud noises and air pollution. The induction heating method, which is introduced in this paper, exhibits good control and allows for the estimation of precise heat input. Also, workers can carry out the induction heating in a comfortable working environment. In this research, the induction heating simulation, which consists of electro-magnetic, heat transfer and thermal elasto-plastic analysis, was developed and modified through induction heating experiments. Finally, the effective heating coil was designed for the automatic hull forming system based on the results of induction heating simulation. For the purposes of a future study, if an algorithm to obtain optimal working conditions is developed, automatic systems for hull forming can then be constructed.

Abstract
 1. Introduction
 2. Induction heating simulation
  2.1 Electro-magnetic analysis
  2.2 Heat transfer analysis
  2.3 Thermal elasto-plastic analysis
  2.4 Induction heating simulation procedure
 3. Design of the induction heating coil
 4. Induction heating experiment
 5. Conclusions
 References

• Hyun-su Ryu(Department School of Industrial Engineering and Naval Architecture, Changwon National University)