Moving heat source are present in numerous problem pratical
in ingeenring. For example, machining process as the Gas tungsten
arc welding (GTAW) , laser welding, friction stirwleing process
or milding problem. Moving heat source are also present in
biological heating as the metabolism or in heat thermal treatment.
All this case, the heat input identification is a complex task and
represents an important factor in the optimization of the process.
The aim of this work is to investigate both the temperature field
as the heat flux delivered to a piece during a process with moving
heat source. The temperature measurements are obtained using
thermocouples at accessible regions of the workpiece surface
while the theoretical temperatures are calculated from a 3D transient
heat conduction thermal model with a moving heat source.
The thermal model solution is obtained analytically (direct problem).
The inverse problem, it means, the estimation of the moving
heat source, uses the Transfer Function Based on Green’s
Function (TFBGF) method. This method is based on Green’s
function and in the equivalence between thermal and dynamic
systems. The technique is a simple approach without iterative
processes, and therefore extremely fast. From the knowledge of
both the temperature profile (hypothetical or experimental temperature
far from the heat source) and of the transfer function it is
possible to estimate the heat flux by an inverse procedure of the
Fast Fourier Transform (IFFT) . The TFBGF is, then, adapted
to solve an inverse heat conduction problem with a moving heat
source. Simulated and experimental test are used for estimating
the heat source delivered to the piece. The estimation of the
moving heat source without use of minimization least square, or
optimization technique is the great advantages of the technique
proposed here. The moving heat source can, then, be obtained
directly from the temperature measured since the 3D transient
analytical solution is obtained and the TFBGF can be applied in
that solution.Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016
