A method on identification of multiple cavities in one finite body based on surface temperature measurements: A numerical and experimental study

Abstract

The quantitative identification of multiple internal cavities of one finite body has become a research focus in fields of both thermographic nondestructive testing and inverse heat transfer problem. At present, due to calculational complexities, little progress has been made in the identification of multiple cavities based on surface temperature measurements. In this study, a new method, based on the topology optimization, for the identification of multiple cavities in one finite body is proposed. A multiple measurements combination method is used to eliminate the effect of the low thermal signature of internal cavities on outer boundaries to obtain accurate identification results. By taking a square test-piece with different cavities as examples, the performance of the method is studied systematically. A series of numerical and experimental test cases have certified that the method has a very superior performance even under the influence of various factors.

Additional information

Funding

The work is financially supported by the National Natural Science Foundation of China (51479203).