РОЗРОБКА МЕТОДИКИ ВИЗНАЧЕННЯ ЗАПАСУ МІЦНОСТІ БОЙОВИХ ЛІТАКІВ НА ОСНОВІ АНАЛІЗУ ДИНАМІЧНИХ ХАРАКТЕРИСТИК З УРАХУВАННЯМ ЕКСПЛУАТАЦІЙНИХ ФАКТОРІВ

Abstract

The article considers the issues of diagnostics of the technical condition of cantilevered aircraft structures based on the dynamic response analysis. This task provides for determining the real technical condition of the damaged structure and, as a result, the reserve factor. The main criterion is to use as little information as possible to obtain a precise objective assessment. It is suggested to use the structural dynamics being the most informative as diagnostic features. These are natural oscillation frequencies (torsional and flexural) and zero-twist axis position (according to the data from volitionally undamaged structures taken as reference). The methodology has been patented. As a technical solution, the methodology provides for frequency tests with dysfunction of flexural and torsional oscillation frequencies under which a minimum frequency of natural oscillations corresponding to the minimum residual strength shall be set for each type of aircraft, namely, for its part - wings, fins (cantilevered structures of the glider). The increased number of analysed natural oscillation frequencies increases the reliability of the residual strength estimation. Based on this, the developed and produced equipment and monitor equipment as a mobile version (which are also patented), can be effectively used when basing aircraft in the combat theatre. Based on the provisions of the NIAS similar monitoring system can be implemented in military units of the Air Force of the Armed Forces of Ukraine during the operation of aircraft according to the technical condition.