METHOD OF THERMAL DIAGNOSING OF LATENT TECHNOLOGICAL DEFECTS OF RADIO-ELECTRONIC
EQUIPMENT AND THERMAL DIAGNOSTIC MODEL THEREOF 

Uvaysov Saygid Uvaysovich, Doctor of engineering sciences, professor, head of sub-department of radio electronics and remote control, Moscow Institute of Electronics and Mathematics of the National Research University "Higher School of Economy" (20 Myasnitskaya, Moscow, Russia), s.uvaysov@hse.ru
Suleymanov Sergey Pavlovich, Candidate of engineering sciences, associate professor, sub-department of radio electronics and remote control, Moscow Institute of Electronics and Mathematics of the National Research University "Higher School of Economy" (20 Myasnitskaya, Moscow, Russia), fdp@hse.ru
Yurkov Nikolay Kondrat'evich, Doctor of engineering sciences, professor, head of sub-department of radio equipment design and production, Penza State University (40 Krasnaya street, Penza, Russia), yurkov_nk@mail.ru 

517.354.62 

Background. The scientists in Russia and abroad are continuously searching for ways and means to improve the quality and reliability of on-board radio electronics (BREA). The values of reliability characteristics are influenced by many parameters, one of which is temperature. The change in temperature causes the changes
not only in reliability but also in electric and mechanical characteristics. Since the heat mode disturbance in the device may be caused by defects, they can be identified by the value of temperature.In this regard, the creation of new methods of diagnosing thermal technology defects is a topical task.
Materials and methods. The method of thermal diagnosis is based on a comparison of the measured temperatures with plenty of temperatures from "the faults base" – electronic directory, which is formed in advance of the diagnosis in the course of solving the problems of thermal control of the projected BREA.It incorporates the principles of a systems approach, the theory of topological modeling and technical diagnostics, and takes into account the design technology solutions that are used by developers of BREA.
Results. The authors developed a method of diagnosing latent thermal technological defects of electronic equipment based on comparison of the measured temperatures with plenty of temperatures from "the faults base" - electronic directory, which is formed in advance of the diagnosis in the course of solving the problems of thermal control of the projected BREA. The main distinguishing feature is the use of modeling of thermal processes for the accumulation of faults instead of the contents of the base of the experiments. For the analysis the researchers developed a thermal diagnostic model.
Conclusions. The suggested method of thermal diagnostics of onboard radio electronic equipment for spacecrafts with long operating life by the temperatures its radio electronic elements allows revealing the overt and latent defects of BREA on the basis of interaction between the diagnostic model and the means of thermal simulation. 

diagnosis, thermal model, latent defect, thermogram, electronic equipment, thermal model. 

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