bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stress-deformed state of the apparatus taking into account the influence of the location of mechanical damage in the zone of corrosive wear
Authors: Rubtsov A V , Kulakov P A , Arkhipova K S , Zakirnichny E G 
Published: November 2020

Abstract
Technological apparatuses of oil and gas refinery and petrochemical industries are the most responsible operational units, since they are used to carry out various technological processes in a continuous mode under the influence of high pressures, temperatures and aggressive working mediums. Due to the design features of the devices, corrosive wear can be both uniform and uneven, as well as concentrate in the areas most prone to corrosion damage. Various scenarios of corrosion damage and different zones of corrosion of constructional elements of the apparatus during operation can radically change the stress-deformed state, worsening the forecast and bringing the apparatus closer to the limiting state. Also, possible negative consequences on the device can be caused by mechanical damage - “risks” that are formed during mounting, repair or during transportation to the installation site. The mutual influence of the most unfavorable zones of corrosion damage to the apparatus and the presence of “marks” in these zones under the influence of operating loads can contribute to the development of the most negative variant of the development of an emergency situation. Currently, work on modeling the stress-deformed state of devices with different levels of accumulated damage, identifying the most loaded areas and the most unfavorable possible outcomes is relevant. This paper investigates the interconnection between the impact on the stress-deformed state of an apparatus with a “shirt” of operational loads, corrosion damage and the presence in this zone of a mechanical defect of the “risk” type with its various locations.
Modeling frequency integrating unfolding converter operation taking into account technological variation in parameters
Authors: Volkov Vadim S , Konkina Maria S 
Published: November 2020

Abstract
The article considers issues for taking into account technological variation in parameters for a bridge circuit of a frequency integrating unfolding converter containing semiconductor strain gauges at high temperature, using the Mathcad software as simulation environment. An analysis of the influence of technological variation in parameters has revealed the emergence of the initial imbalance of the bridge circuit, which is equivalent to the presence of a non-zero input signal, i.e. the pulse repetition frequency error, which is present at the output of frequency integrating unfolding converter at high temperature. A mathematical model for taking into account technological variation in parameters of a frequency integrating unfolding converter based on a semiconductor strain gauge bridge is proposed, which allows calculating the corresponding error. As a result, the above mentioned can be used in the development of additional methods and means for temperature compensation, taking into account features of semiconductor strain gauges, and to increase objectivity in the analysis of calculation results applied to converters of mechanical values into frequency.
Wear resistance of blade and disc working bodies of tillage tilling machines hardened by electrodes T-series
Authors: Rogovskii I L , Borak K V , Maksimovich E Yu , Smelik V A , Voinash S A , Maksimovich K Yu , Sokolova V A 
Published: November 2020

Abstract
Based on a systematic analysis of methods to increase the durability and wear resistance of the working bodies of tillage machines, it is established that their increase in 90% of cases is achieved by technological methods. In turn, this requires the use of expensive reinforcing materials, which leads to an increase in the cost of the final product. The solution of such a complex problem cannot be based on the use of one group of methods, but requires an integrated approach using a range of available groups of methods. Accordingly, the purpose of the work is to determine experimentally possible methods to increase the durability and wear resistance of the working bodies of tillage machines, taking into account the soil and climatic conditions of their operation. In the work, on the basis of soil-climatic conditions of operation of working bodies of tillage machines, operational, constructive and technological methods of increase of wear resistance of ploughshare and disk working bodies are experimentally established. Wear of the working bodies of tillage machines is complex. The problem of increasing the wear resistance and durability of working bodies that interact with the soil environment cannot be solved by using only technological methods to increase wear resistance and durability.
Ore particles segmentation using deep learning methods
Authors: Suprunenko V V 
Published: November 2020

Abstract
The feed size distribution of AG/SAG mills has a big impact on the efficiency of the whole beneficiation process. In this situation is very useful instrument could be a system for estimate size distribution of ore. In this paper method for ore segmentation was developed based on deep learning algorithm and digital image processing. First U-net network was trained on manually labelled images. Then trained network used for extracting particles area and watershed used for obtain final segmentation.
Machine for carrying out work on deep soiling with the simultaneous application of liquid organic fertilizers
Authors: Martynova N B , Bondareva G I , Toygambaev S K , Telovov N K 
Published: November 2020

Abstract
The necessity of carrying out work on deep loosening in lands newly introduced into agricultural circulation in soils of heavy mechanical composition, as well as destruction of the subsoil on old arable lands have been analyzed. Requirements for the work on deep loosening of the soil are grounded. The existing designs of reclamation rippers are considered and a passive two-row subsoiler with front shanks of a volumetric structure and rear curved shanks with additional plowshares is selected. The possibility of combining work on deep loosening and application of organic fertilizers to increase soil fertility, water and air permeability, and create the most favorable soil conditions for plant growth and development has been investigated. The existing rates of fertilization have been analyzed and the possibility of delivering an organic liquid to the enlarged pore space formed after soil loosening has been investigated. The influence of the ongoing agro-reclamation measures on increasing soil fertility, creating an optimal water and air balance for the growth and development of agricultural crops and the expected increase in yield are analyzed.
Analysis of the process of shaping the blanks of the GTE turbine working blades
Authors: Vdovin R A 
Published: November 2020

Abstract
The article provides a detailed analysis of the existing technological process of shaping the rotor blades of gas turbine engines. The main technological operations of the control of the airfoil airfoil are considered, possible reasons for the occurrence of the deviation of the theoretical airfoil of the blade from its real position are given. On the basis of the studies carried out, it was found that for “conditionally defective” blanks of GTE turbine rotor blades, which have insufficient allowance for the polishing operation, by reorienting the blank in space due to the refinement of technological bases, it is possible to achieve a relatively uniform distribution of the allowance and, as a consequence, to transfer them in the category of suitable ones.
Research of adhesive dosing possibility of glued laminated lumber technology
Authors: Razinkov E 
Published: November 2020

Abstract
Since the glue is not an ideal liquid for which the laws of its expiration are generally known, the purpose of our work was to determine the duration and speed of the resin outflow from the container, depending on 2 factors - the height of the container with the resin above the surface on which the resin is applied, and the conditional viscosity of the resin within its working value. As a result of the conducted research, it was found that it is possible to dose the glue in the glued beam technology, when using low-viscosity resins, by lifting the container with the resin (glue) above the level of the surface on which it is applied. Moreover, for low viscosity fluids with a viscosity up to 80 °C (on the examples of water and resin low viscosity) observed increase in flow rate from the container increasing the height of the rise of liquids over the surface to which it is applied. As the resin viscosity increases from 80 to 131s the absolute value of the resin flow rate from the container decreases.
Carbon-based materials in friction units at high temperatures
Authors: Roshchin M N , Krivosheev A Yu , Mishanova V G 
Published: November 2020

Abstract
The issues of the friction engagement of a carbon-carbon composites with steel at high temperatures are studied in the article. The statement on the admissibility of using a carbon composite in friction units at high temperatures is substantiated. Antifriction properties of carbon composite are investigated for friction against steel in the speed range 0.05 - 0.25 m / s and contact pressure 0.3…1 MPa. It has been shown experimentally that the “Hardcarb-T” material has better antifriction properties than the “Argalon-2D” material in the temperature range of + 300 … + 700 ° C and a velocity of 0.16 m / s. The coefficient of friction of the “Hardcarb-T” material in the temperature range 300 … 700 ° C varies from 0.28 to 0.38. With a load of 1.0 MPa and a sliding speed of 0.16 m / s, the friction coefficient of the “Argalon-2D” material is 38% higher than that of the “Hardcarb-T” material.
Ways of improving performance of mobile bricklaying robotic systems
Authors: Malakhov A V , Shutin D V , Marfin K V 
Published: November 2020

Abstract
To integrate innovations into practice, their effectiveness is of critical importance, especially when compared to previous generation technologies. The article discusses the two main aspects of the effectiveness of mobile bricklaying robots, as a technical system on one hand, and as a technology for organizing construction production on another. Efficiency of operation of automated building systems should be considered on the basis of synergistic analysis of these two factors. Study of feasibility of using such systems in organization of construction production is carried out taking into account the construction technology and the principles of construction organization. The efficiency of a robot as a technical system is assessed based on the efficiency of its use of energy and working time. The use of digital drives and optimization of design and algorithmic solutions are considered as means of increasing the energy efficiency of mobile bricklaying robots. A more complete use of working time is also proposed to be achieved through a combination of design and algorithmic solutions and the organization of the movement of material assets at a construction site.
Computer aided engineering design in the development of agricultural implements: a case study for a DPFA
Authors: Patuk Iaroslav , Borowski Piotr F 
Published: November 2020

Abstract
Nowadays, available engineering technologies allow the engineering industry to utilize software with numerical methods to generate optimal designs and solve complex issues in a wide range of tasks. Thus, this method plays a specific purpose for researchers, especially in agriculture, to improve designs which use materials excessively, and develop the geometry of implements optimally. This study focused on optimizing a deep placement fertilizer applicator by way of computer aided engineering. The finite element method simulation was also used to obtain optimum geometric parameters of the deep placement fertilizer applicator by topology optimization. The topology optimization generated a structural shape on the deep placement fertilizer applicator framework body to reduce excessive mass (weight), and propose a new shape for this type of implement. The simulation also reported the total material mass used under static load distribution in the deep placement fertilizer applicator framework. According to the study results, the total mass of the current deep placement fertilizer applicator design could be reduced by approximately 40% under present boundary conditions. The study results provide technical support in the development of agricultural implementation with the proposed design for further practical testability.
Smoothing of the airfoil section having curvature graph oscillations
Authors: Yerokhin A P 
Published: November 2020

Abstract
The article is devoted to the smoothing of the tabulated curves describing the aerodynamic profiles. In the course of the iterative process of changing the geometric characteristics of the airfoil when designing the wing surface, its smoothness may be disturbed. This necessitates smoothing the profile by deviating from some preset points. The paper deals with the issues of ensuring the convexity of the section of the profile, on which the graph of its curvature has oscillations. A smoothing procedure is described based on smoothness criteria obtained from the necessary and sufficient conditions for the existence of a polynomial of the eighth degree. The results of profile smoothing are presented, which confirm the effectiveness of the developed procedure for ensuring the convexity of the smooth curve.
Approaches review and tools analysis for thermal processes modeling in electron beam welding
Authors: Milov A V , Tynchenko V S , Kurashkin S O , Petrenko V E 
Published: November 2020

Abstract
The article is devoted to a review of approaches used to simulate thermal processes occurring during electron beam welding of thin-walled products. The analysis of more than fifty sources is carried out on the basis of which ideas about the current state of the problem considered in the article are formed. To implement the simulation, it is possible to use modern software systems such as: ANSYS, Comsol Multiphysics, Abaqus and NX Nastran, each of which has its own set of advantages and disadvantages. By using the method of expert evaluation on the basis of the formulated criteria, the most effective software was selected. The results of the study of mathematical models implemented in the selected software system will allow not only to get an idea of the thermal process occurring during electron beam welding of thin-walled products, as such, but also to form a mathematical justification for making technological and control decisions.
Local and centralized conditioning systems
Authors: Alhatem Ali 
Published: November 2020

Abstract
This article discusses two main types of air conditioning systems in office buildings: local and centralized systems. Since equipment developers, customers and users have different requirements for the design, installation and operation of air conditioning systems in office buildings, depending on the workload of buildings, location, external conditions, as well as space-planning solutions, air conditioning systems currently come in different types and configurations. Reliable knowledge of classification and the ability to distinguish one system from another is key when choosing the right air conditioning system for the customer. To form a proper understanding of the systems discussed, it is necessary to understand some of the basic terminology and principles of air conditioning systems. These include methods for system design criteria, load calculations (tangible and latent thermal loads, penetration loads, equipment and appliance loads, and air conditioning system requirements).
Improving the wear resistance of cast aluminum alloys by the melt thermal-rate treatment
Authors: Deev V B , Prusov E S , Ri E H , Smetanyuk S V , Feoktistov A V 
Published: November 2020

AbstractThe method of the melt thermal-rate treatment has been successfully tested to increase the macrohardness and abrasive wear resistance of a low-alloy cast aluminum alloy of the Al-Mg-Si system. It was found that an increase in the melt superheating temperature to 900 °C with subsequent isothermal holding and fast cooling to the pouring temperature leads to a decrease in weight loss from 0.359 to 0.324 in comparison with the initial state, which corresponds to an increase in the coefficient of relative wear resistance to 1.11. A good correlation has been found between wear resistance and macrohardness of treated alloys. Application of the proposed approach will increase the service life of aluminum parts exposed to various abrasive effects, however, to further increase the wear resistance, it is recommended to obtain a reinforced composite structure in the Al-Mg-Si system using the melt thermal-rate treatment.
The influence of ovality of the shell-type construction to stress-deformed state
Authors: Kulakov P A , Rubtsov A V , Malyshev V Yu 
Published: November 2020

Abstract
There are many standards that tell us in which ranges the geometry of equipment, piping systems or individual elements of the facility can change. The authors of the article set the task to assess the change in the state of one equipment with possible permissible geometric deviations. As part of the study of the experimental sample, a combination of different variants of ovality was modeled at different pressures up to the yield point. It is shown that there are situations that can reach the yield point at significantly lower loads on the apparatus, as a result of the occurrence of zones of local stress concentrations. Recommendations are given on the real maximum stress-deformed state in the investigated apparatus depending on geometric deviations.
Methods and algorithms for investigating noise and errors in the intelligent measuring channel of control systems
Authors: Jumaev O A , Sayfulin R R , Ismoilov M T , Mahmudov G B 
Published: November 2020

Abstract
The main requirements for an intelligent measuring channel are considered in the article when designing automated control and control systems. The methods for estimating errors are classified and the constituent groups are classified, and some methods for calculating the errors of measuring means and measuring modules of automatic control systems are given.
Combining of orthogonal coding and quadrature amplitude modulation
Authors: Rabin A V 
Published: November 2020

AbstractNoise immunity is one of the most important characteristics of modern information transmission systems. There is a contradiction between the requirements for the noise immunity of radio engineering systems, due to the capabilities of countermeasures, and the lack of methods for increasing the noise immunity at high spectral efficiency and coding rate. The research of ways to increase noise immunity at a fixed transmission rate through the development of special mathematical methods is an actual task.
Mathematical methods application in the risk assessment technologies implementation at oil and gas facilities
Authors: Filipova N S , Volokhina A T , Glebova E V 
Published: November 2020

Abstract
One of the promising studies in the field of risk analysis technologies is the introduction of mathematical models that make it possible to predict the possible number of industrial accidents victims, depending on the influence of various factors. This article presents the results of data statistical analysis of more than 1270 accidents that occurred at the enterprises of the gas transportation system of the Russian Federation in the period from 2006 to 2018. On the basis of the correlation analysis, the dependence of the influence of such a factor as “type of incident” on the number of victims in accidents was established. With the help of regression analysis and graphical interpretation of the data obtained, it was possible to derive a one-factor mathematical function that reflects the relationship between the total number of victims and the number of victims for a certain factor “type of incident – fall”.
Experimental studies of differences in the distribution parameters of multidimensional spatial-subband object vectors on video images during subband information processing
Authors: Kartsan I N , Zhukov A O , Goloshchapova B A , Zalivin A N , Oleynik I I , Orishchuk S G 
Published: November 2020

Abstract
The variant of representation of various objects on video images in the form of samples of space-subband vectors is resulted. The technique of estimation of differences of parameters of distribution of multidimensional space-subband vectors of objects image is given. As indicators of closeness of two regions of localization of space-subband vectors of different objects, the vector of modules of difference of eigenvalues of corresponding spectral matrices of different objects, received from corresponding subband covariance matrices of objects, is used. Experimental estimations of differences in localization regions of different objects of Copter type using their video images are given. It is shown that when there is an obvious external similarity of objects, the areas of their localization differ significantly in size and orientation. It is shown that the localization region parameters of object vectors are practically invariant to object rotations on the image. The possibility of using spatially sub-band vectors and their estimates to build the decisive rules for the recognition of different objects on video images is shown.
On the issue of reducing the sound level emitted by the intake system of an internal combustion engine
Authors: Deryabin I 
Published: November 2020

Abstract
There is currently a problem of acoustic contamination of environment caused by a large number of vehicles. One of the most intense sources of vehicle noise is its power plant - an internal combustion engine, including the exhaust system and the intake of the fuel-air mixture into the working cylinders. When studying the sound field emitted by the intake system of the engine, two components are distinguished: the gas-dynamic sound arising at the cut of the air intake pipe and the structural (body) sound resulting from sound reradiation by the vibrating walls of the body elements. The study of a technique for improving the acoustic characteristics of the engine intake system by making the sidewalls of the packaged component of the intake system in the form of a three-layer structure (mesh bobbin element - porous sound-absorbing layer - acoustically transparent gastight and watertight film) is examined in the article.