PLESHKUNOV S. Methodology of accelerated testing of reinforced surfaces to increase the resource of the aircraft fuel system pump

The dissertation solves the complex task of creating a methodology for accelerated tests of surface strengthening of parts of the fuel pump of the aircraft's power plant, which ensures both an increase in the reliability of the fuel pump and a reduction of time at the conceptual stage of the development of new objects of aviation equipment and during their modernization. An analysis of the structural energy balance of the energy of the friction surface layers of the gears of aircraft units under the conditions of contact interaction was carried out, which made it possible to determine the criterion of fatigue strength of materials: the specific energy of destruction in one load cycle. Based on this, the conditions for conducting accelerated tests on contact fatigue strength using the acoustic emission method were formulated: pulse loading to maximum values with registration of the number of cycles before the onset of fatigue damage. On the basis of this, a method of accelerated tests was developed to determine the indicators of fatigue strength of the surface layers of structural materials, which significantly reduces the time of experimental evaluation when conducting comparative tests of different structural materials or comparing different types of their modification (strengthening). The method of recording the acoustic emission signal has been experimentally determined as a convenient and accurate tool for quantitative assessment of the fatigue damage parameter. It is theoretically established that the main factor affecting the fatigue contact strength of the material is the energy dissipation coefficient, which is constant for each of the materials. The obtained new scientific results made it possible to practically shorten the testing period of variant designs of various methods of strengthening surfaces during friction at the conceptual stage of development of mechanical engineering objects, namely units that include gear transmissions, in particular gear pumps of the aircraft fuel system. The direct application of the determined best method of strengthening surfaces allows to increase the resource of such aggregates, which generally increases the reliability of the systems of which they are a part. This is a critical component in the system of measures to ensure flight safety at the stage of making engineering, technical and technological decisions both in the modernization of existing and in the development of promising models of engineering objects in general and aviation equipment (aircraft) in particular.