Implicit adaptation of mesh model of transient heat conduction problem
This addresses the challenge of modeling heat conduction for materials like alloyed steels where tabular data is scarce, offering a practical solution for industrial applications, though it is incremental as it builds on existing adaptation methods.
The paper tackles the problem of adapting transient heat conduction models for high-temperature heating by identifying temperature-dependent thermophysical parameters, proposing a new approach that uses supervised learning on technological data instead of relying on tabular measurements. The result shows that the trained mesh model achieved an average error of 18.82°C, which is close to the 18.10°C error of the classically adapted model.
Considering high-temperature heating, the equations of transient heat conduction model require an adaptation, i.e. the dependence of thermophysical parameters of the model on the temperature is to be identified for each specific material to be heated. This problem is most often solved by approximation of the tabular data on the measurements of the required parameters, which can be found in the literature, by means of regression equations. But, for example, considering the steel heating process, this approach is difficult to be implemented due to the lack of tabular discrete measurements for many grades of steel, such as alloyed ones. In this paper, the new approach is proposed, which is based on a solution of a related variational problem. Its main idea is to substitute the adaptation process in the classical sense (i.e., to find the dependencies of thermophysical parameters on temperature) with 'supervised learning' of a mesh model on the basis of the technological data received from the plant. The equations to adjust the parameters of the transient heat conduction model, which are related to the thermophysical coefficients, have been derived. A numerical experiment is conducted for steel of a particular group of grades, for which enough both technological as well as tabular data are available. As a result, the 'trained' mesh model, which has not received explicitly any information about the physical and chemical properties of the heated substance, demonstrated an average error of 18.820 C, which is quite close to the average error of the model adapted classically on the basis of the tabular data (18.10 C).