GA-based Heat Input Estimation Technique for Simulation of Shell Forming by Line-Heating

摘要

The temperature of the gas adjacent to the plate T_G and local heat transfer coefficient α can be considered to remain nearly unchanged with time during spot and line heating. A generic algorithms (GA)-based direct identification technique for T_G and α is proposed. T_G and α during a spot heating test is identified by the proposed technique, and T_G for this spot heating test is measured by laser induced fluorescence technique. The validity of the proposed GA-based technique is investigated by comparing the identified and measured T_G, and comparing the measured T_B and that calculated by giving the identified T_G and a as thermal boundary conditions. As results, the followings are found.rn1) Distributions of T_G and a during a spot heating test can be directly identified by proposed GA-based technique. The identified T_G is close to the one measured by a LIF system.rn2) The plate back surface temperature during the spot heating test calculated from the identified T_G and a is comparable to the one measured. The results obtained demonstrate the accuracy of the identified heat input parameters and the validity of the proposed GA-based identification technique.rn3) The proposed GA-based identification technique is valid for the high power heating case for which the conventional IHC-based techniques are not applicable.