Vibrations of high-rise buildings under seismic impact taking into account physical nonlinearityMirzaev, S; Yusupov, M; Rakhmankulova, B; Abdikayimova, G
doi: 10.1088/1742-6596/2176/1/012052pmid: N/A
Analytical description of vibration loads of the complex construction structure is considered as a system of masses connected by means of viscoelastic springs. To take into account the rheological properties of the spring material, the Boltzmann-Volterra principle is used. A mathematical model of the problem under consideration has been developed, which boils down to the solution of a system of nonlinear integro-differential equations. A solution method based on the use of quadrature formulas has been developed and a computer program has been compiled on its basis. The results are shown as graphs. Influence of nonlinear and rheological properties of spring on amplitude and phase of mass oscillations is investigated.
Low frequency hydraulic hammer for wave action of injection wellsZaripova, L M; Gabdrakhimov, M S
doi: 10.1088/1742-6596/2176/1/012029pmid: N/A
The deposition of salts, iron sulfide, precipitating from solutions as a result of disturbance of thermodynamic equilibrium, occurs during operation in the near-wellbore zone (NWBZ). Efficiency of field development, production rates of operating wells, injectivity of wells and the fraction of reservoir energy that can be used to lift fluid directly in the well significantly depends on the state of the bottom well formation zone (BWFZ). It is required to implement measures to influence NWBZ in order to reduce filtration resistance, to increase permeability, improve connectivity with the wellbore, and increase the system of fractures or channels to facilitate inflow and reduce energy losses in this limited formation area. The structural diagram and dynamics of the vibrator are revealed in the paper to accomplish the given tasks.
Assessment of technical state of power transformers based on dissolved gas chromatographic analysis in oilNazarov, O A; Yusupov, D T; Yunusov, R F; Shoyusupov, Sh A; Tolipov, Q S
doi: 10.1088/1742-6596/2176/1/012001pmid: N/A
The work is devoted to the study of a power transformer based on chromatographic analysis of dissolved gases in oil. Data were obtained on dissolved gases (hydrogen, methane, ethane, methylene, acetylene) of power oil transformers of various brands with operation for more than 30 years. Particular attention is paid to the graphical presentation of the results of chromatographic analysis of the oil. As a result, the probable expected defects of power transformers were determined. Studies have shown that power transformers need immediate repair based on their assessment. Timely repair of power oil transformers allows increasing their durability and reliability of power supply to consumers.
Justification of measures aimed at increasing the capacity of a section of a railway line, taking into account its required electrical capacitiesKarlina, A I; Akhmetshin, A R; Suslov, K V; Olentsevich, V A; Sivtsov, A V; Karlina, Yu I
doi: 10.1088/1742-6596/2176/1/012041pmid: N/A
The annual increase in cargo turnover to the Far Eastern seaports contributes to the optimization of the railway infrastructure in order to increase the level of throughput and processing capacity of the Baikal-Amur Mainline and Trans-Siberian Railway facilities. JSC Russian Railways pays special attention to these issues. Organization and promotion of car traffic through the formation of freight trains using the connection technology, “virtual coupling”, heavy and dual trains that move on an ongoing basis is one of the innovative methods for increasing the carrying capacity for highly loaded sections and directions at a level of utilization of their throughput of 0, 8 or more. Under these conditions, the organization of efficient power supply of railway sections and facilities is the main factor influencing the value of the throughput capacity of transport infrastructure facilities. The article presents a technical justification for the measure aimed at increasing the throughput and processing capacity of a section of a railway line, taking into account the stability check of the devices of the traction power supply system. The predicted parameters of the operation of the traction power supply system of the railway line section are given with a promising train schedule.
Surface properties of binary and ternary solutions studied through precision measurementsDzhambulatov, R S; Talkhigova, Kh S; Umarova, L Kh
doi: 10.1088/1742-6596/2176/1/012072pmid: N/A
The paper deals with the surface properties of aqueous two- and three-component organic solutions (water-acetone; water-1,4-Dioxane; water-acetone-1,4-Dioxane). A modern installation, K-100 tensiometer, was used to measure equilibrium surface or interfacial tension, contact angle, etc. The du Noüy ring and the Wilhelmy plate methods were used to measure the surface tension. It shows that the surface tension isotherms for a ternary system do not contain any features uncharacteristic of the surface tension isotherms for lateral binaries. The findings made it easy to specify the adsorption of surface-active agents in water. It shows that the nature of the ternary adsorption isotherms qualitatively coincides with the binary adsorption isotherms, which leads to the conclusion that, once used together as surfactants, organic substances (acetone and 1,4-Dioxane) in water does not enhance the surface activity of each other.
Modeling of loading and unloading processesKhaydarov, T A; Utepov, B B; Rajabov, N Q; Kulmamatov, O A; Кholiyarov, M Sh; Akhmetova, S T
doi: 10.1088/1742-6596/2176/1/012088pmid: N/A
The article theoretically examines the choice of the most optimal of the possible trajectories of cargo in the process of moving goods from one place to another, placing them in the most optimal shape and size, taking into account the characteristics of the cargo. At the same time, using the method of mathematical modeling, the position of objects in space was determined using the functions of the Cartesian and polar coordinate systems. For optimal planning and management of the placement of goods, as well as transport operations along any spatial trajectory, the matrix method of mathematical modeling of these processes was used. Practically all possible cases of cargo movement were investigated and a mathematical expression was formed taking into account the geometry and kinematics of their placement in the given volumes. Based on the results of theoretical studies, three conclusions were drawn
Estimation of parameters and operating modes of the screw cutting deviceAlijanov, D; Jumatov, Y
doi: 10.1088/1742-6596/2176/1/012063pmid: N/A
The research is directed from the theoretical aspect to the development of the design of a new grinder, characterized by low energy and metal consumption. The work investigates the relationship of geometric parameters and speed modes of operation with quantitative and qualitative indicators of the screw cutter system. It is possible to increase the degree of chopping of the stems only by reducing the average cut length, i.e. by increasing the rotational speed screw knife. The experiments shows the average slice lengths and the corresponding productivity of the screw cutting pair depending on the speed of rotation of the knife. That for compliance with zootechnical requirements, modes n= 550-650 rpm.( lav = 8-4,5 sm ) - with vertical loading, and n=400-450rpm (lav = 5,5-4 sm) – at inclined feed at an angle β = 450. An increase in the frequency of rotation of the knife leads to a sharp decrease in the productivity of the cutting pair. The above numerical examples are selected in accordance with the parameters of the experimental setup and show good agreement with the experimental results.