bluuebunny/crossref_metadata_2025 huggingface dataset:
Organization of parallel-pipeline calculations for modeling the pollutant distribution process in a reservoir
Authors: Litvinov V N , Gracheva N N , Filina A A , Nikitina A V
Published: December 2021

One of the most acute problems for today is the water pollution. For rapid decision in emergency situations, it is necessary to develop effective software and algorithmic tools that allow us to make accurate forecasts of the environmental situation changing of coastal systems. Water pollution of the Azov and Black Seas by storm drains and human waste products leads to an increase of toxic substances concentrations that significantly exceed the maximum permissible values. The pollution transport problem is solved on the basis of the Navier-Stokes and the diffusion-convection-reaction equations. As a result of discretization of the continuous problem of transport of pollutants using the finite-difference approach for a rectangular grid, we obtain a system of linear algebraic equations (SLAE) of large dimension, which require significant time costs. To increase the efficiency of calculations (to reduce the time) on a multiprocessor computer system (MCS), there is a need to develop effective parallel algorithms for solving SLAE. The decomposition method for a two-dimensional computational domain is proposed in this paper, which allows organizing a parallel-pipeline process of calculations as follows: at each stage of calculations, each processor core simultaneously processes fragments of the computational domain that are offset from each other. This process is described in the form of a graph, in which each node corresponds to fragments of the computational domain, and the edges – a sign of the adjacency of fragments.
Physical and mathematical modeling of the moving the raw cotton between directing wall and area ginning seeds
Authors: Ahmedov M , Shoraxmedova M , Tuychiev T , Tashpulatov D , Cherunova I
Published: December 2021

In article are brought algorithm and results brought numerically-experimental studies on qualitative and quantitative estimation of the law of the moving the raw cotton from directing walls outgoing between spiked-drum and netlike surface feeder aside worker of the camera ginning machines. It is known that the uniform supply of raw cotton to the ginning process has a direct impact on the efficiency of the ginning process. In the process of ginning, the cotton is cleaned on the surface of the pile drum and net of the supplier, and the crushed gin comes to the working chamber through the gin. As a result of the rotation of the saw cylinder in the working chamber, the cotton fiber is suspended and the rotation is started. As a result of the circular motion of the raw cotton, a raw material roller is formed. In this process, the actual problem is to ensure that the raw cotton consists of small pieces and is uniform in time and width of the equipment. The Comparison got given on calculation shows that increase the corner will bring about increase the growing forming displacement. Increase of this corner will bring the leaflet of the raw cotton about increase of length free moving.
Pose estimation for the case of prolonged under-ice based AUV
Authors: Frolov D , Polovko S
Published: December 2021

The technological operation of AUV docking is considered. An approach to its solution and modeling is proposed. A system for determining the relative position based on cameras and active-light markers is described. Active markers are offered to improve detection in dark deep water. A system of equations for modeling the dynamics of an underwater vehicle is described and a complete mathematical modeling of the whole pipeline of the positioning system is performed: image synthesis based on scene geometry, position determination based on the solution of the PnP problem, generating control based on synthesized measurements and modelling of the corresponding movement of the AUV. The presented model can be used to test various scenarios for the execution of a docking operation.
Improvement of methods of hydrological forecasting using geoinformation technologies
Authors: Zueva A , Shamova V , Pilipenko T
Published: December 2021

This article discusses the possibility of improving hydrological forecasting methods based on a neural network. The hydrological series, its importance and forecasting features are considered. For hydrological forecasting using the MapInfoProfessional geoinformation system, an electronic map has been developed containing information about the rivers of Russia, as well as gauging stations on the Ob River. The electronic map is the basis for creating a module for short-term hydrological forecasting based on an artificial neural network. The features of a neural network, methods of its training and implementation are considered. The developed artificial neural network is a layer of neurons with a linear activation function and a delay line at the input. To predict the levels of hydrological series, real water levels at gauging stations of the Ob River in the Novosibirsk region will be used. The developed module and its capabilities have been tested. The study was carried out on the basis of models of hydrological series, as well as on the basis of levels of real hydrological series. Based on the study, dependence of the root-mean-square error on the number of previous values of series was revealed. The study also shows that it is possible to use a neural network for the current one-step forecasting of levels of hydrological series in conditions of insufficient information about the runoff region and its characteristics.
Assessment of the position of the project water flow in the lower reaches of hydroelectric facilities, using the example of the novosibirsk hydroelectric power station
Authors: Akhmatova N , Mikhaylova T , Pilipenko T
Published: December 2021

Construction of large hydroelectric complexes on the plain rivers of Western Siberia, such as the Ob, as well as other types of anthropogenic impact (infill development, quarrying of nonmetallic building materials, carrying out track works, laying communications, wastewater discharges, etc.) lead to a change in water and channel regimes, hydrological characteristics, channel deformation in the downstream. One of these changes is the landing of water level in the section of the lower pond of the Ob from the Novosibirsk hydroelectric complex to the mouth of the Tom River, which adversely affects navigable conditions of this stretch, operation of water intakes, port and sluice, and also damages the fish industry. The landing of the water level continues to this day, and in order to maintain the design water level, it becomes necessary to increase navigation releases. The design level was changed several times after the commissioning of the Novosibirsk hydroelectric complex due to its low availability, a further change in the availability will lead to a change in the design level mark, or rather its lowering. Therefore, the purpose of the study is to assess the position of the design flow rate at the established design level and make a forecast of changes in water flow depending on the time that has passed since the start of operation of the Novosibirsk hydroelectric complex, taking into account the impact on the channel, carried out dredging works, as well as other types of anthropogenic impacts.
On the parameterization of phytoplankton primary production in water ecosystem models
Authors: Golosov S , Zverev I , Terzhevik A , Palshin N , Zdorovennova G , Efremova T , Bogdanov S , Zdorovennov R
Published: December 2021

Parametrization of the formation of organic matter in ecological models is traditionally carried out by using the dependence of the Michaelis – Menten – Monod type [Monod, 1942], which describes the growth rate of algal biomass depending on the factor limiting their development. One of the biggest drawbacks of these dependences is the presence of empirical parameters in them, which in a complex way depend on environmental factors and are an individual characteristic of various types of algae. These parameters in the models actually become fitting coefficients that provide the best fit between observational data and modeling results, which does not allow for effective diagnostics and forecasting of the state of aquatic ecosystems. In this work, on the basis of dimensional analysis, a parametrization was obtained that describes the photosynthesis of algae depending on the parameters relatively easily measured in natural conditions - total solar radiation, phytoplankton biomass, and water transparency. Parametrization has been verified according to observations on more than 30 different types of lakes located in different regions of the world. The calculated data are in satisfactory agreement with the data of field observations, both qualitatively and quantitatively. Discrepancies in field and calculated data may be due to the fact that the species composition of algae in lakes of different trophic status is not taken into account, which can lead to errors in assessing the efficiency of using solar radiation. Discrepancies may also be related to the total solar radiation, rather than photosynthetic active radiation, which varies in different geographic and atmospheric conditions. The proposed parametrization can be used in the development of mathematical models of lake ecosystems, as well as to determine the trophic status of poorly studied water bodies.
Seasonal change in heat flux at the water-bottom sediment boundary in a small lake
Authors: Zdorovennova G , Terzhevik A , Palshin N , Efremova T , Bogdanov S , Zdorovennov R
Published: December 2021

Heat exchange with bottom sediments is the main component of the thermal regime of ice-covered shallow lakes of the temperate zone, which explains the importance of its study and parameterization for inclusion in numerical models. Circulations arising in ice-covered lakes due to heat exchange with bottom sediments, and existing for several months, can make a significant contribution to the transport of dissolved and suspended particles along the water column. The aim of this work was to study the seasonal variability of the heat flux at the waterbottom boundary in a shallow lake during the under-ice period, including the period of spring under-ice convection. Based on the analysis of data from high-frequency (minute) long-term measurements of water temperature in the bottom area of a small lake in the temperate zone, a wide range of variability of the heat flux across the water-bottom boundary during the winter from minute to daily fluctuations was established. The role of the spring under-ice heating in the change in the heat flow at the water-bottom boundary is shown. It is shown that shallow areas of the lake bottom, falling into the zone of influence of spring subglacial convection, can accumulate heat already at the end of the ice period. The comparison of temperature fluctuations in the deep-water part of the lake and tin he area with depths close to the average is carried out. It is shown that the spectrum of temperature fluctuations has similar periods, however, in time, sharp temperature jumps in different areas of the lake do not coincide.
Investigation of the effects of main geometric parameters and flow characteristics on secondary flow losses in a turbine cascade
Authors: Mesbah M , Gribin V G , Souri K
Published: December 2021

This paper presents numerical simulation results of a three-dimensional (3D) transitional flow in a stator cascade of an axial turbine. The influences of the main geometric parameters and flow characteristics including, the blade aspect ratio, pitch-to-chord ratio, inlet flow angle, and exit Mach number, on secondary flows development and end-wall losses, were studied. The numerical results were validated by the results of experiments conducted in the laboratory of the steam and gas turbine faculty of the Moscow Power Engineering Institute. The maximum difference between computed and experimental results was 2.4 %. The total energy losses decrease by 20 % when the exit Mach number changes from 0.38 to 0.8. Numerical results indicated that the blade aspect ratio had the most effect on secondary flow losses. The total energy losses increase by 46.6 % when the aspect ratio decreases from 1 to 0.25. The total loss of energy by 13.2 % decreases by increasing the inlet flow angle from 60 degrees to 90 degrees. Then by increasing the inlet flow angle from 90 to 110 degrees, the total loss rises by 3.6%. As the pitch-to-chord ratio increases from 0.7 to 0.75, the total energy losses are reduced by 12.2 %. Then by increasing the pitch-to-chord ratio from 0.75 to 0.8, the total energy losses increase by 6 %. As with experimental data, the numerical results showed that the optimal inlet flow angle and relative pitch for the cascade are 90 degrees and 0.75, respectively.
Solving the problem of classification of material properties using a neural network
Authors: Babushkina N E , Lyapin A A
Published: December 2021

The article sets the task of classifying various materials and determining their belonging to a specified group using a recurrent neural network. The practical significance of the article is to obtain the results of the neural network, confirming the possibility of classifying materials by the hardness parameter using a neural network. As part of the study, a number of experimental measurements were carried out. The structure of the neural network and its main components are described. The statistical parameters of the experimental data are estimated.
Methods for solving the nonlinear equilibrium equation of a compressed elastic rod
Authors: Peshkhoev Isa M , Kanygin Georgy I , Fatkhi Denis V
Published: December 2021

A nonlinear boundary value problem on the equilibrium of a compressed elastic rod on nonlinear foundation is considered for cases of free pinching or pivotally supported of the ends. The problem is written as a nonlinear operator equation. Numerical and analytical methods for solving nonlinear boundary value problems are discussed: The Newton-Kantorovich method and the Lyapunov-Schmidt method. We also consider a problem linearized on a trivial solution (the eigenvalue problem), which has an exact solution (Euler) in the case of a hinge support, and for the case of pinching the ends of the rod, the solution formulas are obtained in the works of A. A. Esipov and V. I. Yudovich. The eigenvalue problem is also solved by numerical method. To determine the equilibria of a nonlinear boundary value problem for a given value of the compressive force, it is proposed to apply the Newton-Kantorovich method in combination with the numerical methods, using as initial approximations the asymptotic formulas of new solutions found using the Lyapunov-Schmidt method in the vicinity of the critical value closest to the current value of the compressive load. Numerical calculations are performed and conclusions are drawn about the effectiveness of the methods used.
Mathematical modeling of stress-strain state of the nodal joint of wooden beams
Authors: Sergeev M S , Lukin M V , Strekalkin A A , Roshchina S I
Published: December 2021

The article presents a study of the joint of wooden beams on a new type of aluminum composite connector. For the numerical experiment, beams with a cross-section of 150x220(h) mm made of solid wood were selected. The beams were connected at the same level in a perpendicular direction to each other. The connecting connectors were made of two types of alloys: 7075 T6 and 6061 T6. The experiment was carried out until the joint was completely destroyed under static load. The elastic operation of the node for different types of connectors under study was maintained until the load of 50… 70 kN, after which there was a sharp increase in the deformations of the beams. Conducting a numerical study of the elements of wooden structures made it possible to predict their behavior most accurately in real operating conditions.
Mathematical modeling of mechanical properties of vibro-centrifuged fiber-reinforced concrete of variatropic structure
Authors: Shcherban’ E , Beskopylny A , Mailyan L , Stel’makh S , El’shaeva D
Published: December 2021

Today, one of the most relevant areas in the construction industry, linked to the requirements and provisions of the Strategy of Scientific and Technological Development, and in accordance with the priority areas of science and technology development, is the development and improvement of low-material, low-energy and low - resource-intensive technologies for the manufacture of concrete and reinforced concrete products and structures. In this regard, the technology of vibrocentrifugation, which allows to obtain concrete with an improved variatropic structure, is quite promising. In this work, the influence of the design parameters of the technological equipment and the parameters of the centrifugation modes on the integral strength characteristics of vibrocentrifugated fiber concrete was evaluated. In total, 13 samples of the annular section were manufactured and tested. Calculations of the integral strength characteristics of vibrocentrifugated fiber concrete depending on the height of the technological protrusions of the clamps and the angular rotation speed were performed by the method of orthogonal composite planning of the 2nd order using the MathCAD program. The mathematical method of planning the experiment is aimed at creating mathematical empirical models that determine the influence of the incoming variable factors on the strength characteristics. Thus, according to the results of experimental studies, the optimal height of the technological protrusions and the angular speed of rotation were determined. Thus, further regulation of technological factors in the manufacture of vibrocentrifugated products and structures will allow us to obtain the most effective ring-section structures with enhanced variatropy.
Simulating Nonlinear Dynamics of a 3D Crystal Lattice of Metals
Authors: Semenov A S , Semenova M N , Bebikhov Yu V , Zakharov P V , Korznikova E A
Published: December 2021

Oscillations of crystal lattices determine important material properties such as thermal conductivity, heat capacity, thermal expansion, and many others; therefore, their study is an urgent and important problem. Along with experimental studies of the nonlinear dynamics of a crystal lattice, effective computer simulation techniques such as ab initio simulation and the molecular dynamics method are widely used. Mathematical simulation is less commonly used since the calculation error there can reach 10 %. Herewith, it is the least computationally intensive. This paper describes the process and results of mathematical simulation of the nonlinear dynamics of a 3D crystal lattice of metals using the Lennard-Jones potential in the MatLab software package, which is well-proven for solving technical computing problems. The following main results have been obtained: 3D distribution of atoms over the computational cell has been plotted, proving the possibility of displacement to up to five interatomic distances; the frequency response has been evaluated using the Welch method with a relative RMS error not exceeding 30 %; a graphical dependence between the model and the reference cohesive energy data for a metal HCP cell has been obtained with an error of slightly more than 3 %; an optimal model for piecewise-linear approximation has been calculated, and its 3D interpolation built. All studies performed show good applicability of mathematical simulation to the problems of studying dynamic processes in crystal physics.
Numerical analysis of shear interaction of an underground structure with soil
Authors: Rikhsieva B B , Khusanov B E
Published: December 2021

A soil layer behaviour under the shear interaction of an underground structure with soil is studied. Structural failure is considered under conditions of strained soil, and complete cohesion is assumed at the underground structure-soil contact boundary. The Finite Difference Method is used to numerically investigate the process of the structure-soil shear interaction under consideration. The main attention is paid to the adequacy of the conditions of soil-structure interaction, and to the strain state of the near-contact soil layer around the underground structure. The results are plotted and analysed. From the results obtained, the existence of a near-contact soil layer is shown; the use of the condition of complete cohesion is justified considering the structural failure of soil under conditions of complex interaction; the possibility to determine the thickness of the near-contact soil layer and of the layers with the respective degrees of structural failure is shown.
Main rotor blade modeling approaches comparison. Finite element and Craig-Bampton methods
Authors: Borisenko V , Leoro J , Didenko A
Published: December 2021

The paper focuses on the helicopter main rotor blade FE model. And the main goal is to prove the feasibility of the helicopter main rotor MBD model in calculations of blade deformation as a result of applied aerodynamic forces. FE model is used as a basis for two different computational methods. A mathematical approach in the MBD based on the Craig-Bampton method on the one hand. And finite element model on the other hand. The results of high-frequency blade rotations are obtained. Calculations of these models are compared in order to determine the best method for modeling a linear-elastic blade. By the results, it is necessary to consider the preloaded state of the blade when using the Craig-Bampton method approach. The comparison of blade nodes displacements at various external conditions for both models are given. The influence of rotor MBS model damping parameters on the amplitude of blade oscillations under sinusoidal action is considered.
Mathematical modeling of production process using cluster analysis methods
Authors: Dolaeva A R , Medvedeva T A
Published: December 2021

Manufacturing process management is a complex problem characterized by decision-making throughout the entire production process and is reduced to finding the best set of possible (alternative) in terms of some criterion or criteria for the use of available resources. The goal of the production process optimization is to analyze a set of alternative production options in complex systems and to determine the most rational possible state depending on the selected management strategies. The system contains many connections between elements and is influenced by random factors. It is not possible to create a real model for the system that is described analytically, but it can be investigated by using simulation modeling. In the mathematical modeling of the production process cluster analysis methods are used which allow to process a large amount of data from all possible states of the system and divide them into similar aggregates according to several characteristics. The analysis of the formed groups is carried out and the regularities that have the most significant impact on the occurrence of states into clusters are revealed.
Digital transformation of machining workshop’s manufacturing system
Authors: Reshetnikova E , Bochkarev P , Gumarov G
Published: December 2021

The article proposes the method of intellectualization workshop’s manufacturing system. The digital technology is widely developed today so intellectualization of manufacturing system is relevant today. The use of AMT-supported manufacturing process in manufacturing system contributes to obtaining advantages in material and financial terms and reducing the cost of time resources.The use of automation technology in workshop process assumes cutbacks to its funding and ensures its digitalization. The digitalization is aimed at eliminating production errors and shortcomings already at the design stage of the production process. In consequence of this technological defects of products are reduced and the technological process is well organized. The use of an innovative approach to the development of the technological process of manufacturing products allows reducing time resources and increasing technical efficiency. Actualization of the suggested approach provided with system of computer-aided planning multiproduct technologic process. This system is developed by the authors and aimed at planning the intelligent product campaign. The presented algorithmic and software support for the formation of a rational set of control-and-measuring tools provides the development of a rational technological process for manufacturing a product and automation of the production’s technological preparation.
Choice of cargo delivery option in multimodal connection based on reinforcement learning
Authors: Badetskii A P , Medved O A
Published: December 2021

The article discusses the issues of choosing a route and an option of cargo flows in multimodal connection in modern conditions. Taking into account active development of artificial intelligence and digital technologies in all types of production activities, it is proposed to use reinforcement learning algorithms to solve the problem. An analysis of the existing algorithms has been carried out, on the basis of which it was found that when choosing a route option for cargo in a multimodal connection, it would be useful to have a qualitative assessment of terminal states. To obtain such an estimate, the Q-learning algorithm was applied in the article, which showed sufficient convergence and efficiency.
Methodology of adjusting the strategy of technical systems maintenance and repair according to the results of their operation
Authors: Gera V , Mosyagin R , Kalmykov E , Pudikov V
Published: December 2021

In the publication the authors solve the problem of forming the optimal volume of control actions to maintain the technical systems (TS) service availability. To achieve the desired result the analysis of the TS as a service object was carried out. As a result of the analysis the system elements with a level of reliability below the required level are assigned to a separate group for which the maintenance modes are formed later, their actual state being taken into account. Namely, the decision is made what work on these elements can perform and what forces and means of the technical support system will be required for their operation. To form a list of necessary operations, the functional scheme analysis of the TS considered is carried out, during the analysis the functional as well as degradation characteristics of the system elements are determined as well as the significance (weight) of each element in the system. The analysis of the functional scheme of the TS is performed by using the functional-topological method.
Tension devices: mathematical modeling and applications in water transport
Authors: Fokin R , Abissova M , Atoyan A
Published: December 2021

Tension devices -are throwing devices, the action of which is based on the elastic tension of the plates (shoulders), in fact, these are bows and crossbows. Currently, various types of bows and crossbows controlled by a single shooter are widely used in hunting and sports. In the ancient World, high-power crossbows were used as artillery, served by several warriors: ballistae, scorpions and others. In the paper, bows and crossbows of all currently common types are modeled using mathematical methods. This model, which is the subject of this paper, differs from similar ones, which actually model only traditional English bows. All these models have the main purpose of analytical calculation of the speed of the arrow at the moment of its separation from the bowstring. Our model uses the law of conservation of energy, considering only the initial and final moments of acceleration of the arrow. It identifies 2-4 implicit indicators that fully describe each type of tension devices. To obtain input data, 2-3 experimental shots are made with 1-2 parameters measured each time. As a result, the calculations are reduced to solving systems of linear equations and to calculations using formulas. The paper offers 3 areas of application of tension devices on water transport, firstly, ship management and its operational repair (for this purpose, analogues of ancient powerful crossbows are relevant), secondly, protection of the ship, cargo, anti-terrorism, and thirdly, physical education and sports for the crew and passengers. The use is due to their fire safety, power, low noise, a variety of types of projectiles.
Efficiency of cluster schemes implementation for discrete dynamic programming for systems of support of dispatching technological processes in transport systems
Authors: Reznikov M , Fedosenko Y
Published: December 2021

Within the framework of a computationally complex canonical scheduling problem, formulated by an optimization model for one-processor servicing of a finite deterministic flow of objects, a scheme of computational process of an algorithm of discrete dynamic programming in cluster implementation is considered. Variants of balancing of computational subtasks over network cluster array are investigated, purposed to reduce the volume and intensity of intranetwork interaction. It has been established that for practical improvement of efficiency of cluster algorithm, it is required not to increase the uniformity of distribution of subtasks among the cluster nodes, but to minimize the network traffic between the cluster nodes. Balancing options are proposed that allow to significantly increase localization of data in network computing. Experimental results are analytically confirmed, showing the scaling limits of implementation of discrete dynamic programming algorithms on a cluster architecture. The method for choosing the number of computational nodes and dimension of the problem being solved, which provide a threefold reduction in overhead costs for network exchange, is shown. The results obtained make it possible to objectively substantiate the choice of methodological and algorithmic approaches when choosing computer tools developing architectural and technological solutions for dispatching systems support in inland water transport.
Method of characteristics for the problems of stages of the serviceability check of elementary section of a gas pipeline for operation
Authors: Khujaev I K , Aminov Kh , Akhmadjonov S , Ismailov A
Published: December 2021

The article is devoted to modeling the gas-dynamic state of an elementary section of a gas pipeline during gas injection and its outflow through the choke in the final section of the pipe and to solving these problems using the method of characteristics. The subject of the study is the gas-dynamic state of an elementary horizontal section of a gas pipeline in the process of checking its serviceability for operation. The processes of gas injection into the section and gas outflow from it, considered in the article, were modeled using the N.E. Zhukovsky formula on gas outflow into unbounded space in a framework of the short pipeline approach. The original equations are linearized by introducing the mass flow rate of gas and waves traveling in two directions. When solving the problem, the method of characteristics was applied; numerical results were obtained and analyzed using an analytical solution to the problem. The research methods are based on the laws of conservation of momentum and gas mass, the d’Alembert method for solving a system of hyperbolic equations and the methods of conducting a computational experiment. An analytical solution to the problem with a rupture caused by an instantaneous change in the gas pressure at the end of the section is obtained. It is shown that the process proceeds with the formation of compression and rarefaction waves, and their multiple reflections at the ends of the section. The gas in the section tends to a state of rest with time, and the changes in the mass flow rate and gas pressure are of exponential nature.
Design and research on intelligent ventilation system of ship cargo hold
Authors: Ba Zhongfeng , Zhang Zhijie , Zong Yonggang
Published: December 2021

Ventilation in the cargo hold of ships, which can adjust the temperature and humidity in the cargo hold, is a necessary measure to ensure the safety of maritime cargo. Traditional ship cargo hold ventilation includes natural ventilation and mechanical ventilation. Its ventilation effect is limited, which often leads to cargo damage accidents such as mildew of the cargo in the cabin. Based on the research of intelligent cargo hold ventilation technology, this paper proposes a design scheme of ship cargo hold ventilation system. The ventilation system includes a system platform and electrical connection elements supported by the system platform. Among them, the system platform is electrically connected to the concentrator, the concentrator is electrically connected to several collectors and electric control devices, the collector is electrically connected to several collection nodes, and the electric control device is electrically connected to the ventilation device. The collection nodes of the ventilation system, including temperature and humidity sensors, air pressure sensors, and wind speed and direction sensors, are installed in the cargo hold of the ship. The collection nodes are evenly distributed in multiple locations in the cargo hold of the ship, effectively monitoring the temperature, humidity, air pressure, wind speed and direction of the cargo hold of the ship, and transmitting it to the system platform through collectors and concentrators to realize real-time monitoring. According to the setting of different environmental standard values, it can automatically complete the startup, shutdown and reverse operation of the wind turbines in different positions, making the system more accurate in monitoring the environment of the ship’s cargo hold, effectively reducing cargo damage, ensuring the safety and economy of maritime freight, and It can more effectively save energy, reduce carbon emissions, protect the environment, and make the system more practical.
Modeling processes that provide an avalanche of innovation growth
Authors: Diakonova S , Artyshchenko St , Medvedeva N , Gusev M
Published: December 2021

This paper proposes an addition to Kondratyev’s theory of the emergence of innovations in long cycles. Regularities of the emergence of crisis phenomena and the concept of “avalanche-like growth of innovations” are considered. The study investigated the innovation peaks occurring in the middle of the depression phase, followed by the growth stages of economic activity after a certain period of time. Research has shown that the active emergence of innovations, which we have called the “snowballing growth of innovations,” falls in the middle of the depression phase. The authors investigated and supplemented the theory of the triggering effect of depression, which is similar to the action of the trigger, which results in an “avalanche-like growth of innovations”. To describe the processes associated with resonance and trigger effects, the authors propose to use the parametric resonance model and the Mathieu equation. With the help of mathematical modeling of innovation processes, a more accurate description of the periodic change in the number of innovations over time is possible, namely, the “avalanche-like growth of innovations”.
Development of algorithm for fuzzy art appraisal model
Authors: Nosov V V , Tindova M G
Published: December 2021

This paper presents an algorithm for a fuzzy art appraisal model, which is a hierarchical model based on a base price and the following adjustment. In the first step of the model, we determine the list of linguistic variables, their number, types of terms and types of membership functions for each term. Then, we analyze the subject area, process expert information and build a knowledge base containing 50 predicate rules of inference. The analysis shows that the model reflects a 4.37% error in a porcelain figurine appraisal. The paper also outlines recommendations on the implementation of the developed algorithm for fuzzy art appraisal model using Fuzzy Logic Toolbox for Matlab package and explains package limitations such as the need for strong authentication of art pieces, identification of mass artworks and a limited range of artwork that can be appraised.
Modeling of material flow management processes in the formation of transport logistics chains
Authors: Shvetsov A V , Dondokov Y G
Published: December 2021

The article proposes a mathematical model for optimizing the interaction of road and sea transport. The model allows to optimize the process of material flow management in the formation of transport logistics chains. The solution to this problem is especially important given the observed growth of competition between operators carrying out cargo transportation along international transport corridors. The application of the model is aimed at reducing the idle time of both vehicles waiting for unloading in the port, and reducing the idle time of ships awaiting loading of ships in ports. The relevance of using the proposed model is based on the constant growth of cargo traffic going through the ports, as well as the existing restrictions expressed in the lack of space for storing goods in anticipation of the arrival of ships in most modern ports participating in international cargo transportation, in addition, an important factor is that in most of these ports the time the passage of trucks to the port is regulated by certain hours of the day.
Mathematical modeling of traffic volume in the suburban area based on the time series decomposition
Authors: Pechatnova E V , Kuznetsov V N
Published: December 2021

This study aims to the development of mathematical modeling methods based on time series decomposition. This method is used to describe various consistency or recurrence processes. Such a process is the distribution of traffic volume throughout the year. Its modeling is one of the leading research tasks in the transport sector. One of the urgent tasks is the assessment and forecasting of the traffic volume in the suburban areas. The study is carried out on the road section P-256 Chuysky Trakt (Novosibirsk - Barnaul - Biysk - Gorno-Altaisk -state border with Mongolia) near Biysk. Traffic data is obtained for 2019. Python is used in modelling. The statmodels module is used to decompose the time series. The multiplicative model is chosen. The adequacy of the model is checked on two groups of data. The first is the traffic volume data on the same road section for 2020. The average relative error was 5%. The second is the road section A-322 Barnaul - Rubtsovsk - the state border with the Republic of Kazakhstan in the suburban area of Aleysk. The average relative error was 6%. The results confirm the adequacy and versatility of the model.
The research development of the structure in a-Fe Microcrystals with the Orientation <110> deformed by compression with different values of the friction coefficient
Authors: Zavyalov A , Lukin A , Lukin O , Timofeyev A
Published: December 2021

The paper analyzes the change in the dislocation structure in a-Fe microcrystals with orientations <100> and <110> deformed by compression under conditions of limited flow with different values of the friction coefficient. The orientation stability of the microcrystal and texture is investigated when the compression axis deviates from the normal to the compression plane. Shooting and analysis of limited pole figures made it possible to establish that the operation of the OSS in the MC with the [100](001) orientation at different values of the friction coefficient at the sample-punch interface leads to a rotation of the latticework relatively to the MC axis. The specific conditions of plastic deformation under compression determined by the MC morphology prohibit displacement deyz., as the deformation is observed under conditions of limited flow. The operation of the OSS, consequently, leads to the MC partition with the [100] (001) orientation deformed by compression with the friction coefficient Kmax into parts and the rotation of the latticework around the growth axis. It is established the connection between the friction coefficient at the crystal-punch interface and the sliding geometry in a-Fe MCs deformed by compression under conditions of limited flow. The authors carried out the dimension of the friction ratio has a significant effect on the slip geometry and the dislocation structure formed in the MC of the [100] orientation deformed by compression along the (001) plane. Changes in the friction coefficient and the angle deviation of the compression axis from the normal to the compression plane in the MC with the [100] (001) orientation do not affect the slip geometry and the dislocation structure formed during plastic deformation.
Features of phase transformations in powder steels upon heating
Authors: Egorov M , Egorova R , Atrohov A , Ekilik V
Published: December 2021

At present, powder materials are used in practically all branches of industry, from medicine to aerospace technology. This is a wide range of materials ranging from constructional and instrumental materials and ending with special-purpose materials and medical implants. Powder metallurgy methods are most often used where the manufacture of products with desired properties is impossible using traditional methods: casting, stamping, etc. Heat treatment is understood as a set of operations of heating, holding at high temperatures and cooling in order to change the structure and workability of the material, improve the combination of its mechanical and physical properties without changing the shape and size of products. Heat treatment is an effective method for improving the physical and mechanical properties and wear resistance of steel. The specific features of sintered steels (porosity, structural heterogeneity, high oxidizability, etc.) make it difficult to use the technological modes of heat treatment developed for cast steels, although the main regularities of the processes occurring during heating and cooling of compact steel can be transferred to sintered materials. Heat treatment of powder steels has a number of features, primarily due to residual porosity, as well as chemical and structural heterogeneity.
Magnetic-abrasive finishing with new diffusion-alloyed materials based on dispersed metal waste
Authors: Panteleenko F , Petrishin G , Panteleenko E
Published: December 2021

The article discusses the issues of assessing the effectiveness of the use of new diffusion-alloyed ferromagnetic abrasive materials in the technology of magnetic abrasive finishing. The productivity of processing and the roughness of the processed surface were evaluated as they are considered to be the main performance criteria of ferric-abrasive powders (FAP). There were researched three types of powders: common Fe-TiC powder, obtained by the sintering (as a reference), and two new diffusion alloyed (borated and nitrocarburized) FAP, made of low-carbon finely dispersed ferrum-based wastes. Both new proposed diffusion-alloyed powders have better cutting characteristics then reference powder, explained by the structure features and their properties. Evaluation of productivity and roughness of surface shows, that there is their direct dependence of morphology, hardness and fragility of powder particles. The best cutting characteristics has borated powders, as they have microhardness 18,000-20,000 MPa and the tendency to brittle fracture, that leads to the new less-sized particles with sharp cutting edges creation.
Experimental study of the destruction in CFRP laminates at the macro-level by acoustic emission method
Authors: Severov P
Published: December 2021

The author conducted experiments using the method of acoustic emission under uniaxial tension of specimens of CFRP laminates with different stacking, geometry and stress concentration. The influence of a mutual arrangement of the material destruction zone and the extensometer installation site on the nonlinear deformation is revealed. It is shown that the damage accumulation process is highly informative when determining the energy of AE pulses. The possibility of visualizing the formation and development of destruction zones in orthogonal directions, as well as the possibility of determining the moment of crack start from the apex of the notch during splitting, is established. The mechanism of alternating stress relaxation in two developed zones of destruction is revealed. The paper shows a high degree of correlation between mechanic and acoustic-emission events. Finally, the author suggests assessing the mechanical state of material with the account of obtained damages by the degree of its integrity (one to zero) depending on the load history, its individual geometric features and stress concentration.
Determination of changes in the mechanical properties of polymer composites with the addition of agglomerates of WC nanopowder
Authors: Oleynik A , Chayka T , Gavrish V
Published: December 2021

Recently, there has been a growing interest in the development of new composite materials with improved characteristics. The article presents the results of tests of composite specimens based on aramid fabrics modified with WC nanopowder agglomerates obtained from carbide manufacturing waste. The following mechanical characteristics were investigated: transverse bending resistance, fracture resistance and energy absorption during contact with a physical body at high speed. According to the results, the transverse bending resistance increased by 35% at a WC concentration of 5%. When 3% WC powder was added to the matrix composition, the total crack length after impact was almost halved. The largest increase in energy absorption of the samples was about 30% at 1% additive concentration. The significant increase in the investigated parameters can be explained by the complex morphology of the embedded particles. In further investigations it is planned to study in detail the mechanism of distribution of nanodispersed WC powder additive in the volume of the modified material.
Mixed magnesian binders using local silicate waste production
Authors: Lytkina E
Published: December 2021

Today, the waste of the mining industry is more than 8 billion tons. Analysis of the literature data showed that most of the man-made waste that is generated as a result of the development of mineral deposits is suitable for use in many industries, in particular, in the production of building materials. The use of technogenic raw materials allows us to solve the following tasks: Environmental aspect - reducing the number of dumps and reducing their volumes. And this, in turn, improves the ecology of regions and territories. 2. Economic aspect - reducing the cost of construction products through the use of almost free raw materials, the release of more competitive products. Of course, it is necessary to provide that part of the costs will be spent on additional processing, revision, activation, modification of this technogenic raw material component. But today we have to think about how to clear the territory of substandard “waste rock” and use it to reduce the production and consumption of natural raw materials. A similar process can create waste-free production.
The relationship of casting conditions with the structure and properties of sacrificial materials
Authors: Kireev A V , Kechin V A
Published: December 2021

The application of cast protectors in systems of cathodic protection of metal structures and structures from electrochemical corrosion is well known. Alloys based on aluminum, magnesium and zinc are widely used as sacrificial materials for the manufacture of sacrificials. The choice of designs and standard sizes of protectors is carried out taking into account the provision of the required service life of the protector protection systems in various operating conditions. The structure of cast protectors plays an important role in stabilizing the electrochemical characteristics of sacrificial materials. The paper describes the characteristics of sacrificial alloys and cast sacrificials, and also shows the influence of casting conditions on increasing the values of the efficiency factor (KPI) of sacrificial materials.