bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of heat exchanger for heat recovery of process gases
Authors: Sysoev I A , Sysoeva T I , Kondrat’ev V V , Kolmogortsev I V , Kolosov A D , Ershov V A 
Published: July 2019

Abstract
Due to new requirements of the Russian laws on the environment and energy efficiency, studies on effective methods for recovering waste heat from flue gases are crucial. Most oil and gas, metallurgy and chemical manufacturers remove high-temperature process gases. Gas cooling preceding cleaning reduces a volume of cleaned gases. For example, the most efficient dust and gas cleaning systems usually operate at a gas temperature of up to 200 °C. An increase in gas temperature can cause irreversible deformations of metal structures of the gas cleaning equipment and its premature failure. In addition, bag filters used for gas cleaning have strict limitations on gas temperature. As a part of the present project, an optimal design of staggered heat exchange elements in the form of perforated copper ribs was developed. The design documentation was developed and an experimental heat exchanger was designed. To monitor and control heat exchanger parameters, sensors were installed on the experimental heat exchanger (EHE). The algorithms of the automated system were developed. Laboratory and pilot tests proved the efficiency of the equipment designed for cooling waste process gases. The heat exchanger can be installed in gas flues of various diameters. The number of cooling units depends on technical requirements and operating and installation conditions.
To the question of the estimation of the impact of transport streams on the ecosystems of roads
Authors: Sushkov S , Burmistrova O , Timokhova O , Timokhov R , Burmistrov V , Chemshikova Y , Mikhaylenko E 
Published: July 2019

Abstract
The article is devoted to solving the actual problem of assessing the environmental situation and the choice of options for further development of economic and economic activity of man without destroying the stability of the natural environment. This article discusses a system designed to support the analytical activities of forest enterprises. An assessment of the environmental situation in the area of operations of enterprises is presented. The choice of options for further development of human economic and economic activities is aimed at sustainable development without destroying the stability of the natural environment.
Improving the efficiency of technological machines in the interaction with adhesive materials at negative temperatures
Authors: Zenkov S A , Balahonov N A , Kirichenko O P 
Published: July 2019

Abstract
In this paper, the object of study is a technological machine that develops the cohesive ground. The MAXFLIGHT 04 anti-icing fluid is considered as a means of controlling the adhesion of the “soil-to-metal” system used in the operation of technological machines while developing moist cohesive soils under negative temperatures. The aim of the study is to increase the productivity and efficiency of technological machines in the developing wet cohesive soils at negative temperatures by reducing the soil-to-metal adhesion. Mathematical processing of the research results allowed us to obtain regression equations for two working conditions: a regression equation without using prophylactic agents to reduce soil adhesion and a regression equation using the MAXFLIGHT 04 anti-icing fluid. Using the obtained regression equations, the proportionality coefficient (the reduced friction coefficient f) was calculated. According to the calculation results, the values of the obtained proportionality coefficient depend on the shear plane of the temperature.
Virtual prototype for co-simulation of hub-motor dynamics with brushless DC motor and elements of fault-tolerant control
Authors: Bushuev D A , Kiseleva T Y , Rubanov V G 
Published: July 2019

Abstract
The paper describes the virtual prototype of the hub-motor with a planetary gear, brushless direct current motor (BLDCM) and a fault-tolerant control system for Hall Effect sensors failure. The co-simulation model of the BLDCM control system with integration of the hub-motor mechanical part constructed in MSC Adams software based on PI controllers, pulse width modulation (PWM), and fault-tolerant algorithms for Hall Effect sensors failure is described. Simulation results of the hub-motor virtual prototype with the fault-tolerant control system are shown and discussed.
Analysis of the working processes of electromagnetic pulse machines
Authors: Neyman V Yu , Markov A V 
Published: July 2019

Abstract
The tendency of constructing variants of electromagnetic pulse machines of shock action is considered. A brief description of different variants of electromagnetic machine design is given and their comparison is made. Based on the energy balance in the electromechanical system, the working processes in these machines are analyzed. The engineering-and-economical performance of the electromagnetic machines is increased by preliminary accumulation of potential and magnetic energy in the working cycle of the machine.
Operating modes of vacuum plasmatrons with hollow cathodes
Authors: An’shakov A S , Cherednichenko A V , Serikov V A , Domarov P V 
Published: July 2019

Abstract
Results of experimental studies of starting characteristics of vacuum plasma torches in glow discharge mode with switching to abnormal glow discharge and arc discharge are presented. It is demonstrated that if high-frequency current source is used parallel to direct current, ion current is increased and the time of starting mode is reduced. Experimental smelts of tantalum, tungsten, molybdenum, zirconium, and titan were carried out in operating modes with measurement of liquid metal surface temperature in relation to the supplied heating power.
Features of the operating modes of a hot hollow cathode in a vacuum arc discharge
Authors: Cherednichenko A V , Zuev S P , Serikov V A 
Published: July 2019

Abstract
The design features of the hot hollow cathode, its thermionic characteristics and current-voltage characteristics of a vacuum arc discharge with plasma-forming gases of helium and argon are considered. The rationale for these characteristics based on the theory of vacuum-arc discharge is given. The article discusses the use of a hollow cathode discharge for processing tantalum powders.
Study of forming conditions of technogenic materials in the unit with elastic forming elements
Authors: Sevostyanov M V , Martakov I G 
Published: July 2019

Abstract
The article presents scientific and technical developments and analytical studies of the process of forming technogenic materials in a press-roller extruder equipped with pressing bodies — rollers with elastic forming elements. Technical solutions implemented in the design of the unit provide reliable capture of the charge by the forming rolls, uniform distribution of stresses along the material compression arc, as well as increasing the operational reliability of the machine. This is important when forming technogenic materials with different physical-mechanical and rheological characteristics.
Electromagnetic interference filter for spacecraft power bus
Authors: Zhechev Y S , Kosteletskii V P , Zabolotsky A M , Gazizov T R 
Published: July 2019

Abstract
The paper considers the protection of radio-electronic equipment against common and differential mode interference by means of a filter based on lumped elements. The authors have developed a schematic diagram of the filter to be used in power supply circuits of a spacecraft, and present and compare the results of circuit simulation and experiment. The results are useful for further development of noise protection devices for the spacecraft power bus.
Calculation of power and energy indicators of the process of materials rapture during their processing with the help of an inertial tool with a curved cutting rim
Authors: Bondarenko I R , Volkov D Yu , Kovalev LA 
Published: July 2019

Abstract
The article presents the research which reveals the analytical dependences for the determination of the strength and energy characteristics of the process of materials rupture during their processing with an inertial tool with a curved cutting surface. The research was performed on the basis of the laws of classical mechanics, as well as existing models of the destruction of brittle materials. The revealed dependencies reflect the interrelation of power and energy indicators of the instrument and its structural and technological parameters of work, as well as the mechanical characteristics of processed material. According to the results of a brief comparative analysis of the values of power of processing, obtained from the analytical dependence and the results of a trial experiment, the assessment of the applicability and further improvement of the obtained analytical dependencies was made.
Development of modal filter prototype for spacecraft busbar protection against ultrashort pulses
Authors: Khazhibekov R R , Zabolotsky A M , Zhechev Y S , Kosteletskii V P , Gazizov T R 
Published: July 2019

Abstract
The protection of the onboard equipment of the spacecraft from an ultrashort pulse (USP) based on modal filtering is proposed. The paper presents the results of the development of a modal filter (MF) prototype with a broad-side coupling. When choosing a structure, the maximum bus current, insulation breakdown voltage, wave impedance of line and the duration of the interfering USP are taken into account. To substantiate the choice of structure, quasi-static and electrodynamic simulations are performed. The simulation showed that the MF with resistance of 50 Ω at both ends of the passive conductor effectively weakens the 0.45-ns USP by 4 and with non-resistance connection on the passive conductor by 7. The MF prototype without resistors is made. Frequency dependence of |S
21| is measured. An experiment showed that the MF weakens the USP by 5.61. The bandwidth of the MF is 60 MHz.
The choice of rational stiffness joints parameters of the cabin suspension levers in the vehicle
Authors: Polyakov Yu A 
Published: July 2019

Abstract
The article is devoted to the choice of rational stiffness parameters of the joints in the suspension levers in the vehicle cabin. The method of formation of cabins dynamic models at their inclusion in spatial dynamic models of vehicles is offered and programmatically realized. In the known methods, the attachment of the cabin to the frame is not taken into account or simulated using linear springs with parallel inclusion of linear dampers or without them. The proposed method deals with the geometric features of the lever guide apparatus, the location of shock absorbers and elastic elements, the presence of a stabilizer in the cabin suspension. In addition, the elastic-damping properties of the mounting parts of the cabin suspension elements are considered. This made it possible, even at the design stage, to investigate the effect of the stabilizer’s torsional stiffness and the stiffness of the cabin suspension joints on the vibration loading of the cabin and the driver’s seat, which are noticeable at frequencies above 7 Hz.
Oscillations of circular cylindrical shells with imperfections of shape
Authors: Seregin S V 
Published: July 2019

Abstract
The impact of initial irregularities of ideal circular cylindrical shape on bending vibrations of thin shells is studied. For the first time ever, the possibility of appearance of the additional splitting zone of the flexural frequency spectrum caused by the shell having initial shape irregularities has been described. It is established that the splitting of the frequency spectrum happens not only when the number of waves of circular dynamic deformations is equal to the number of waves of shell shape irregularities (as it was previously thought), but also when the number of shape-generating waves is twice as low as the number of shape irregularity waves.
Durability and corrosion resistance of high-strength powder concretes
Authors: Tolstoy A D , Lesovik V S , Glagolev E S , Yakimovich I V , Krzhivitsky A A , Khakhalev V P , Krymova A I , Artebyakin V M 
Published: July 2019

Abstract
One of the performance indicators of building products and structures made of high-strength concretes is their durability, which determines the urgency problem of preserving high construction and technical properties over time. In this regard, an important task is to create new ways of the durability prediction and corrosion resistance of high-strength concretes in conditions of aggressive environmental exposure. This article discusses the issues of determining the durability of high-strength powder concretes under the action of one of the most common aggressive factors is sulfate solution. The results development of an accelerated method for predicting the durability of powder concretes in sulfate medium are presented.
Self-restoration hardening systems of high-strength concrete of a new generation
Authors: Tolstoy A D , Lesovik V S , Glagolev E S , Vodopyanov I O 
Published: July 2019

Abstract
Preservation over time of the characteristics of high-strength artificial rock materials is currently the most important task. The operating practice critical structures, such as, for example, tall frame buildings, shows, unfortunately, the insufficient durability of the in-situ reinforced concrete from which these structures are constructed. Internal corrosion processes are complemented by external aggressive effects (temperature and humidity changes, changes in the gas composition of the ambient air, etc.). This article deals with issues of self-restoration (“autogenous healing”) of the concrete structure. Their solution is provided by a method of overgrowing the interaction products of elements of an aggressive solution (external factor) and components of hardening concrete (internal factor).
Consideration of welding stresses when welding technological rectangular cutouts
Authors: Velikanov N L , Koryagin S I , Sharkov O V 
Published: July 2019

Abstract
The article discusses the method for determining the prestress fields in hull structures with a rectangular cutout. After welding of the cutout the fields of residual welding stresses in the welding area are summed up with the prestresses. Methods of the mathematical theory of elasticity (the complex potentials in particular) are used. It is assumed that a uniform stress state is created in the plate in the absence of welds. Welding causes a disturbance in the uniform stress field. It is proposed to use complex potentials for writing the weld boundary conditions corresponding to the absence of displacements at their boundary. An example of a method of creating prestresses in the plate when welding a rectangular hole is given.
Limitation of the dynamic load in the hoist mechanism of the shovel based on the additional drive
Authors: Kuznetsov N K , Iov I A , Iov A A 
Published: July 2019

Abstract
In the article, the results of studies of the synthesis of the optimal structure and parameters of the electromechanical system of the hoist mechanism of the rope shovel EKG-8I, which provides the limitation of dynamic loads, are presented. The procedure of structural-parametric synthesis is described, which is based on the determination of the required control actions, independent from the structure of the control system of the hoist mechanism. Control actions were found by solving the inverse dynamic problems for a given type of oscillatory motions of the dipper in the start-up and load change modes. Based on the expression of the obtained time dependencies through the phase coordinates of the system and its combinations, the structure and parameters of the control system were found. The found structure of the control system of the standard electric drive of the hoist mechanism and the additional drive ensures the implementation of a given law of motion of the dipper. The numerical simulation of the electromechanical system of the hoist mechanism with an additional drive confirmed the effectiveness of using the proposed approach of reducing the dynamic loads with maintaining the productivity of the excavator.
The results of bearings diagnostics of ship electric motors and generators
Authors: Sergeev K O 
Published: July 2019

Abstract
The article discusses the results of in-place diagnostics of rolling bearings of ship generators and electric motors, carried out on more than one thousand five hundred units. The main methods for diagnosing the technical condition of rolling bearings, applied in the diagnostics on ships, are considered. The statistics of detection of various types of rolling bearing defects is given. The conclusions on the reliability of bearing assemblies with rolling bearings are drawn. The directions for further improvement of diagnostic methods and work practices are indicated.
Comparative evaluation of austenite grain in high-strength rail steel during welding, thermal processing and plasma surface hardening
Authors: Kolosov A D , Gozbenko V E , Shtayger M G , Kargapoltsev S K , Balanovskiy A E , Karlina A I , Sivtsov A V , Nebogin S A 
Published: July 2019

Abstract
In the process of plasma surface hardening, a surface layer that consists of zones of different sizes with different phase and structural composition is formed. The minimum grain size for plasma surface heating is determined by the initial austenitic grain. Its size depends on the dispersion of the initial structure. The rate of plasma heating at 200-1000 °C/s affects the size of the initial grain. The further growth of austenite crystallites with an increase of temperature essentially depends on the heating rate: small rates and high temperatures of plasma surface heating can lead to a significant enlargement of the grain. Increase of the heating temperature in the zone of thermal influence during welding from 900 to 1040 °C of rail steel 76F leads to the growth of the austenitic grain from No. 9 to No. 7 and individual grains – from No. 8 to No. 3. The largest austenite grains while heated at 1000 and 1040 °C form separate zones where conglomerates of large grains predominate. Stiffness of 76F steel, heat-strengthened on the troosto-sorbitol structure, deteriorates substantially when the temperature of rapid heating increases from 900 to 1040 °C. This also increases the instability of stiffness.
Investigation of macro and micro structures of compounds of high-strength rails implemented by contact butt welding using burning-off
Authors: Shtayger M G , Balanovskiy A E , Kargapoltsev S K , Gozbenko V E , Karlina A I , Karlina Yu I , Govorkov A S , Kuznetsov B O 
Published: July 2019

Abstract
Investigations of the structural components of rail joints, obtained by contact butt welding using burning-off, which are revealed on the surface of kinks after the destruction of the compounds during static bending tests and after destruction in operating conditions, were carried out. Analysis of the microstructure and chemical heterogeneity of the fracture surface was carried out with the help of a scanning electron microscope JEOL JIB-Z4500, equipped with an attachment for energy-dispersive analysis. The analysis showed that the main structural defects were poor penetration and inclusions of iron-manganese silicates that significantly reduced the parameters for mechanical tests of welded joints. Their presence in welded joints is unacceptable. Clusters of inclusions of aluminosilicates, so-called matte spots, and oxide films of a more complex composition are formed in the compound on the basis of non-uniformly distributed nonmetallic inclusions of the metal of the rail.
Pulse-contact frictional interaction of microprotrusions of friction pairs of brake devices
Authors: Volchenko N A , Volchenko D A , Polyakov P A , Krasin P S , Fedotov E S , Evchenko A S 
Published: July 2019

Abstract
The article materials disclose contact-impulse frictional interaction of microprotrusions of friction pairs of strip-block brakes, based on the principles of the gradient theory of electric and thermal fields. The effect of “transistor” was applied by selecting friction pairs of the brake to reduce their energy loading, and as a result, wear resistance increase.
Choosing the materials performance and the form of an indenter for arrangement of texture at the surface of skin mill rolls
Authors: Ogarkov N N , Platov S I , Zvyagina E Yu , Molochkova O S , Makarova I V 
Published: July 2019

Abstract
The fraction for forming texture of rolls surface of the training mills is investigated in this work. The fraction from various manufacturers has been estimated by comparing the most important characteristics. Metallographic studies of the steel fraction microstructure were carried out on the MEIJI 2700 optical microscope (Japan). Automated processing of measuring results of various shapes indenters microhardness was conducted. Comparing the obtained results with the characteristics declared by the manufacturers was carried out. The rolling roll surface microstructure with which the texture of the cold-rolled strip surface is formed, is investigated in the paper. Roller steel widely used at present as well as the most common methods of rolling roll surface microrelief forming, such as mechanical and electroerosion ones, are discussed in the work. It was established that with the electroerosion method, a more uniform structure with a smoothly changing microrelief was formed on the surface of the roll as compared with the mechanical action of the abrasive. According to the results of the research, recommendations were formulated on the use of the fraction that has the best performance characteristics and which allows one to obtain surface roughness by transferring it to the surface of a cold-rolled strip in accordance with the requirements of consumers.
Modern approaches to water drying in the underground transport system
Authors: Porsev E G , Gavrilova Zh L 
Published: July 2019

Abstract
The analysis of the process of electroosmotic water depletion in soils surrounding the track structure of the underground is given. It is established that due to the fact that the structure of soils is disturbed during the construction of the underground, the electroosmotic water loss in them has its own peculiarities, therefore it is necessary to optimize the process by the criterion of specific energy inputs for mass transfer.
Improving efficiency of flexible manufacturing system based on optimal readiness of technologies
Authors: Pishchukhin A M , Akhmedyanova G F 
Published: July 2019

Abstract
The efficiency of using flexible manufacturing systems (FMS) depends on their workload. However, in order for the FMS not to work for the warehouse, it is necessary to coordinate its production with the requirements of the market. Both the market and the production process are stochastic, so the probabilistic matching of these two processes based on the Kolmogorov equation is considered in the paper. The level of approval is estimated by the difference in the probability density of the market price for a product exceeding the level of its production cost using the technology implemented in FMS. The latter probability density assesses the readiness of technologies for implementation, including the availability of raw materials, materials, energy, serviceable equipment and devices – all of this is spent on managing resources. The optimal allocation of these control resources in the preparation of technologies can significantly improve the efficiency of FMS. Of practical significance is the identified logarithmic relationship between the probability density of the demand for this product on the market and the probability density of the readiness of the technology implemented in this FMS for the production of this product in the required amount and allocated financial means to improve this readiness.