Effect of the sorting track profile change on the it’s occupancy quality at train humping

To increase the hump yard capacity, it is necessary to ensure high quality of sorting track occupancy. The purpose of this paper is to study the effect of changing the track profile on the quality of its occupancy. The simulation model developed for occupancy of sorting tracks based on the calculation of the speed of the cut and taking the following into consideration was used for the study: the possibility of starting the cut movement after a stop, errors in operation of the devices in charge of the speed of releasing the cut to the track, the possibility of displacement of the cars when the next cut collides with them. A real profile of the sorting facility track was analyzed as an example of it. It was determined that the profile caused strong effect on the track occupancy quality. The sagging of the profile causes an increase in the probability of collision of the cuts with exceeding the permissible speed. An increase in the up-gradient reduces the range of the run-off distance, which in turn causes an increase in the number of car back-ins. Profile correction will allow increasing the track occupancy quality

Influence of opposite elevation on the occupancy level of the tracks of sorting park

The purpose of this paper is to study the effect of the location and magnitude of opposite elevation on the occupancy level of the tracks of sorting park. The subject of the study is the effect of the magnitude and location of opposite elevation on the sorting tracks occupancy level. The object is the tracks of sorting park. For the study, a simulation model of the traffic of the cut in sorting park was used, taking into account the reverse movement, “SortPark”. On the basis of this model, it was concluded that when the target point is moved farther from the braking position, the distance traveled by the cut first increases, and then decreases. This is due to the fact that when stopping the cut on the opposite elevation, it can start to move backward. On the basis of this, it was concluded that the useful length of the sorting yard track for the first detaching limited by the point of change of gradient from grade to opposite elevation. In view of this conclusion, the formula for determining the sorting track occupancy level was improved

Influence of opposite elevation on the occupancy level of the tracks of sorting park

The purpose of this paper is to study the effect of the location and magnitude of opposite elevation on the occupancy level of the tracks of sorting park. The subject of the study is the effect of the magnitude and location of opposite elevation on the sorting tracks occupancy level. The object is the tracks of sorting park. For the study, a simulation model of the traffic of the cut in sorting park was used, taking into account the reverse movement, “SortPark”. On the basis of this model, it was concluded that when the target point is moved farther from the braking position, the distance traveled by the cut first increases, and then decreases. This is due to the fact that when stopping the cut on the opposite elevation, it can start to move backward. On the basis of this, it was concluded that the useful length of the sorting yard track for the first detaching limited by the point of change of gradient from grade to opposite elevation. In view of this conclusion, the formula for determining the sorting track occupancy level was improved

Розробка методики побудови математичних моделей стану ґрунту під впливом клину

Studies of the technique of construction of mathematical models on the condition of soil under the action of wedge are presented. Based on hypothesis about separation of the layer of soil by a wedge through its bending, we constructed a mathematical model of determining normal and tangential stresses in soil under the action of wedge. Using mathematical dependencies, we obtained patterns of the distribution of maximum tensile and compression stresses, dependent on the depth of motion of wedge at different angles of crushing the soil. It was found that crushing of soil, which is determined by the size of lumps and chunks, formed under the action of the soil­cultivating working bodies, has a direct dependence on the covered path to reaching limiting stresses in soil. The increase in the distance of the passage of working bodies until the start of the process of cleaving the soil layer contributes to formation of lumps and chunks of larger size. The studies revealed that the wedge, depending on the angle of crushing, strength indices of soil and depth of cultivation, may create in it stresses, necessary for the cleaving, at the initial moment of motion after covering the distance equal to 10 mm and longer. Stresses in soil grow with an increase in the angle of crushing and depth of cultivation. To substantiate parameters of a chisel blade, in particular geometric profile of the rack, we used the method of the calculus of variations. Substantiation of the point of a chisel blade was carried out in two stages. At the first stage we substantiated the profile of chisel of the point taking into account the provision of necessary deepening into soil at minimum energy consumption, at the second stage – the profile of the point with minimum energy consumption by the results of studies, connected with substantiation of the chisel. Analysis of traction resistance of chisel working bodies established that the improvement in the profile of the point ensures reduction in traction resistance of a chisel working body. The data analysis of experiment demonstrated that the coefficient of structuredness of soil after its treatment by standard and experimental points has practically identical value; the improvement of profiles of the points of chisel organs does not lead to worsening the quality of soil treatment. The data analysis on determining traction resistance of chisel working bodies showed that, compared to the standard one, the experimental working body has lower traction resistance. Thus, experimental studies confirm reliability of results of theoretical studies on the substantiation of the profile of the chisel of a chisel working body from the point of view of reduction in their energy consumption while providing for the quality of crushing the soil.Описана математическая модель для определения напряжений, которые возникают в почве под воздействием клина. Получены зависимости, с помощью которых для разной глубины обработки и прочностных показателей почвы в зависимости от заданных параметров качества проведения операции можно определить необходимый угол крошения. Полученные зависимости позволили определить параметры динамических систем, которые способствуют снижению их энергоемкости, повышению качественных показателей работы и созданию условий для повышения производительности агрегатовОписано математичну модель для визначення напружень, які виникають в ґрунті під впливом клина. Отримано залежності, за допомогою яких для різної глибини обробітку і показників міцності ґрунту в залежності від заданих параметрів якості проведення операцій можна визначити необхідний кут кришення. Отримані залежності дозволили визначити параметри динамічних систем, які сприяють зниженню їх енергоємності, підвищенню якісних показників роботи і створенню умов для підвищення продуктивності агрегаті

A nitroalkane-based approach to one-pot three-component synthesis of isocryptolepine and its analogs with potent anti-cancer activities

A second generation polyphosphoric acid-mediated one-pot three-component synthesis of indoloquinoline scaffold is developed. This improved version of the process involves electrophilically activated nitroalkanes for the installation of strategic C-C and C-N bonds and ring C assembly. This modification allows the elimination of unnecessary solvent change operations and all steps are carried out in a true, uninterrupted one-pot manner. A further improvement involves the possibility to install an ortho-amino group in situ. A synthetic application of this method is showcased by the concise synthesis of an isocryptolepine alkaloid and its synthetic analogs with potent anticancer activities.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A nitroalkane-based approach to one-pot three-component synthesis of isocryptolepine and its analogs with potent anti-cancer activities

A second generation polyphosphoric acid-mediated one-pot three-component synthesis of indoloquinoline scaffold is developed. This improved version of the process involves electrophilically activated nitroalkanes for the installation of strategic C–C and C–N bonds and ring C assembly. This modification allows the elimination of unnecessary solvent change operations and all steps are carried out in a true, uninterrupted one-pot manner. A further improvement involves the possibility to install an ortho-amino group in situ. A synthetic application of this method is showcased by the concise synthesis of an isocryptolepine alkaloid and its synthetic analogs with potent anticancer activities