Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Development of a Technique for Diagnosing Brake Blocks of Rolling Stock Made of Composite Materials A.G. LARCHENKO, D.A. YAKOVLEV In this paper, the scope of products from thermosets and thermoplastic materials is considered. The question of diagnosing composite products is raised. The main control methods, advantages and disadvantages are described. The article proposes to use a high-frequency method to detect various kinds of defects in products made of composites. When organizing control by high-frequency currents, the primary task was solved - the experimental choice and assignment of the heating temperature, at which no structural transformations occur. The results of heating products to a temperature of 300 °C are presented. In the work, the subtask of the analysis of the temperature effect on the operational properties of products is solved. The process of flaw detection is described with the presentation of the resulting graphical data, which make it possible to judge the presence of a defect. Conclusions are drawn, goals for further research are set. Keywords: diagnostics, control, flaw detection, products from thermosets, composite materials. DOI: 10.25791/pribor.9.2022.1357 Pp. 01-05.