PSI - Issue 59

518 O. Fomin et al. / Procedia Structural Integrity 59 (2024) 516–522 Oleksij Fomin, Pavlo Prokopenko, Yevhenii Medvediev, Larysa Degtyareva / Structural Integrity Procedia 00 (2023) 000 – 000 3 workpieces have been formed. The statement about the polyharmonicity of the input power change in the grinding process is substantiated. Anti-wear properties of jet fuel based on three types of biocomponents of rapeseed oil and their mixtures were experimentally investigated (Yakovlev et al., 2019). Biocomponents have been shown to be much better lubricants than conventional petroleum fuels for AJE. Studies have shown that adding biocomponents to aviation fuel strengthens the boundary layers and improves the anti-wear properties of fuel mixtures. The article (Kondratiev et al., 2019) outlines the main aspects of the multi-stage optimization of the mass of the main structural elements of the composite protective fairing of the launch vehicle under simultaneous thermal and loading conditions. The authors Boichenko et al. (2020) describe the main approaches and methods used in the research. Gulak et al. (2023) analyzed the operating conditions of traction drives of electric rolling stock with asynchronous traction motors. In the operation of the electric traction drive, both with direct torque control and vector control, possible unstable modes were found in terms of power supply and load. The article Negreya et al. (2023) describes the main approaches and methods used in the research. a 1 ,a 2 the estimated distance from the points of contact of the wheels with the rails to the middle of the respective (running and non-running) necks of the axle of the wheel pair are taken, respectively r the radius of the wheel rolling, r = 0.45 m (for medium worn wheel) or by measuring the wheels of the prototype К D N coefficient of vertical dynamics on the oncoming wheel; the value of the coefficient is considered positive in the case of unloading wheels К D NR coefficient of vertical dynamics on a non-running wheel; the value of the coefficient is considered positive in the case of unloading wheels Н hl horizontal lateral frame force Q h - gravity of the spring parts of the car acting on the neck of the axle of the wheelset 2. Methodology The main factors that directly affect the stability coefficient are vertical and longitudinal forces, which, respectively, depend on the own weight of the wagons and the weight of the train acting in the longitudinal direction. Therefore, the main directions for determining the stability coefficient were chosen to vary the location of wagons in the train and reduce their own weight (tare). To achieve the set goal, the following tasks were defined and solved: development of theoretical provisions for conducting research; carrying out dynamic running tests with determination of indicators of dynamic qualities of the wagon during its movement and dropping from wedges with determination and evaluation of natural frequencies of oscillations; analysis of results and determination of recommendations. 3. Results and discussion Among the light-weight wagons that derail most often were empty platform wagons model 13-4012 and hopper wagons for cement model 15-1443-06. Also, these freight wagons were used in the work as objects of research. To achieve the goal, the following tasks were defined and solved: Nomenclature β the angle of inclination of the wheel crest to the horizontal axis μ q coefficient of friction gravity of the mass of unsprung parts that come to the wheel pair the distance between the middles of the necks of the axle of the wheel pair 2b