bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Eco-driving of Signalized Intersection Fleet in Vehicle-Road Cooperative Environment
Authors: Su Dan , Jiang Kun
Published: February 2021

In recent years, traditional motor vehicles have suffered increasingly severe constraints on energy resources. Coupled with the increasingly serious hazards of pollutants emitted by transportation, an important strategic goal for the development of China’s transportation industry has been set for energy conservation and emission reduction. Vehicle-road collaboration technology is a cutting-edge technology in the field of intelligent transportation, which can guide drivers in ecological driving strictly in accordance with the actual traffic environment in which the vehicle is located. Therefore, researchers are paying more and more attention to how to reduce vehicle fuel consumption and emissions. Signalized intersection as an important node in urban roads needs to be studied. However, the focus of its research so far is on bicycles, and most researchers are indifferent to the situation in which vehicles are likely to run together within the intersection. In addition, when establishing an eco-driving model, most researchers will still focus on how to achieve energy conservation and emission reduction only from the perspective of reducing the number of parking times, and do not care about the essential attributes of fuel consumption. As a result, it is difficult for us to better control and quantify the overall implementation effect of the model. Based on this, it is very important to actively establish a corresponding fleet ecological driving model based on the fleet within the signalized intersection in the vehicle-road collaborative environment.
Virtual Modeling of Vision Sensor on Smart Cars
Authors: Zhang Ning-ning , Yang Xiang , Yang Xu , Xine-Yan  , Wang Ya-Ou , Li-Gao  , Wang Xing- Ren
Published: February 2021

In order to build a visual sensor in a virtual environment and simulate a smart car obtaining information from external environment, the OpenGL development environment is established based on the Microsoft Visual C++6.0 language program; then the image acquisition unit and processing unit model is built, and finally the vision sensor model is installed on the car model to realize the virtual modeling of the vision sensor on smart cars, so that the smart car can obtain information from external environment in a virtual manner.
Analysis of Shenzhen Port Container Development Countermeasures under the Background of Guangdong-Hong Kong-Macao Greater Bay Area
Authors: Youlin Li , XinWei Chen , ZhiSen Huang , ZhiTe Wu
Published: February 2021

The construction of the Guangdong-Hong Kong-Macao Greater Bay Area brings new opportunities for the future development of Shenzhen Port, but it also faces many challenges. Due to the large number of ports in the Bay Area, large and small, rich port resources, leading to increasingly fierce competition between ports. Therefore, the article mainly to Hong Kong and Macao Grand Bay Area as the research of environment, analyzes the status quo of Shenzhen Port Container development, followed by The exponential smoothing model is used to predict the container throughput of Shenzhen Port, finally, on the basis of the prediction results, relevant countermeasures are put forward for the better development of container transportation in Shenzhen Port, and the development path of Shenzhen Port in the context of the Greater Bay Area is sought.
Simulation-based emission calculation method for container terminal production operation system
Authors: Liu Bin , Wang Yihong
Published: February 2021

The emission calculation method based on actual energy data and mathematical analytical models have the disadvantages of time-consuming and high cost, and therefore it is necessary to study a system simulation-based method for calculating the emissions of container terminal production operation systems. This paper develops a simulation model of container terminal production operation systems based on the Arena simulation platform. Emission calculation formulas are embedded into the simulation model, which can calculate and output the energy consumption and emissions of ships and handling equipment. To validate the system simulation-based emission calculation method, a container terminal is taken as the research object and a series of simulation experiments are conducted. The main results show that (1) NOx is the main air pollutant and the CO2 and NOx emissions mainly come from ships, which are 90.7% and 80.4%, respectively, and (2) CO2 and NOx emissions during navigation of ships in the waterway are the main part of ship emissions and account for 60.7% and 53.9%, respectively.
Optimal design of building materials logistics transportation scheme in Beijing based on “outside gathering and inside distribution”
Authors: Hong Han
Published: February 2021

Under the national strategy of vigorously promoting transport restructuring and winning “the battle of blue sky protection”, it is of great significance to promote the railway freight to undertake the distribution of goods and materials in big cities, which can alleviate the traffic congestion on urban roads and optimize the quality of urban environment. This paper puts forward the concept and mode of green logistics of “outside gathering and inside distribution“ according to the flow characteristics of production and living materials in cities. It analyzes the market relationship between the production and use of building materials in Beijing, building the optimization model of freight transport scheme based on railway transport, and the logistics transportation scheme of building materials in Beijing is optimized and designed. This paper provides a scientific method for the transportation organization of production and living materials in big cities.
Analysis on the Application of BIM Key Technology in Road and Bridge Construction Management
Authors: Zhang Baocheng
Published: February 2021

With the rapid development of science and technology, BIM technology is widely used in many fields. The application of BIM technology in road and bridge construction management can provide a strong basis for the management decision of the whole process of road and bridge construction, improve the level of road and bridge construction management, and ensure the quality and service life of road construction. In addition, the application of BIM technology can not only shorten the construction period but also save the cost of roads and bridges. BIM technology plays an important role in the construction process of road and bridge engineering.
Analysis of inclined leg angle on stress of V-shaped Pier Rigid Frame Bridge
Authors: Biyu Bao
Published: February 2021

Taking daquanhu super large bridge as an example, the bridge is a prestressed concrete V-shaped rigid frame bridge, full width of bridge of 38.0m, and main girder of single box three chamber section. Through the finite element analysis and calculation, this paper compares the influence of the angle of inclined legs and the spacing of inclined legs on the bending moment value of V-shaped pier, and summarizes the rules, which can provide reference for similar projects in the later stage when drawing up the size.
Study on the longitudinal nonlinear seismic behavior of the arch bridge with steel tubular frame without inner filling
Authors: Chen Yulong , Feng Jia , Li Li
Published: February 2021

The dynamic analysis model of a typical cantilever hollow steel tubular skeleton arch bridge in the western high-intensity region is established to obtain the longitudinal nonlinear seismic performance of the bridge. By combining the N-F 2-D yield surface of each key fiber section of a bridge, the critical section state of a bridge under the action of E2 rare intensity earthquake is evaluated and described, and the overall seismic performance of the structure is evaluated. The research results show that: The results show that the damaged part of the structure under the longitudinal and vertical seismic action is mostly the bottom of the upper arch column, and the upper arch column closer to the arch is more likely to be damaged, which is the weak part of the structure.
Prediction of temperature field of embankment in permafrost region of Qinghai Tibet railway
Authors: LinaWang  , QiangLiu  , YonghaoXu  , MaolinLi
Published: February 2021

Temperature field distribution of Qinghai-Tibet railway is important for analyzing embankment stability. Based on the finite element method, the analysis model of temperature field is developed for predicting the changes in embankment thermal field in the following 40 years. The results show that the permafrost will degenerate to seasonally frozen soil.
Research and Engineering Application of Soft Soil Unloading and Deformation Model
Authors: Xu Wenyu
Published: February 2021

Soft soil is a multiphase medium composed of solid soil particles, pore water, pore gas and combined water film adsorbed on the surface of particle group and colloid between particles. It is widely distributed in coastal, middle and lower reaches of rivers and delta of lakes. Its physical and mechanical properties and engineering characteristics are complex and regional differences are obvious. With the rapid development of social economy and urbanization, it will inevitably lead to serious problems such as urban land tension, traffic congestion and environmental pollution. These coastal cities are the leaders of China’s economic development. After more than 30 years of rapid economic development, the construction scale of these cities in China is also expanding, and the supply and demand of construction land is becoming increasingly tight. The contradiction between supply and demand is more prominent. With the scarcity of land resources and the rapid development of economy, a large number of construction projects in Qianhai area have been started, among which the construction of subway is also on a large scale. The shortage of land resources and the increase of land development make the high density and high strength building development along the subway line. The development of these building properties is bound to appear a large number of complex deep foundation pit projects, and the excavation of deep and complex foundation pit near the side of subway tunnel is a common form of excavation. In practical construction projects, due to the influence of external factors such as complex construction site conditions and urgent time requirements, people often pursue the progress of foundation pit excavation too much in actual construction, ignoring the research and application of mechanical properties of soft soil foundation, which leads to the safety accidents of subway tunnel structure from time to time. This is closely related to the mechanical properties of soft soil with high moisture content, high compressibility and low bearing capacity. Therefore, deep and large foundation pit engineering in soft soil area is prone to heavy engineering safety problems such as underground continuous wall and other retaining structures. Therefore, the further study of the unloading deformation model of soft soil, the physical and mechanical properties and engineering characteristics of soft soil has a positive and important economic value and social role in engineering in the future.
Research of Damper Parameters of Large span Suspension Bridge
Authors: Wenjun Gao , Yi Hangyu , Chen Yulong , Zhang Ben
Published: February 2021

This paper research the parameter selection range of large span suspension bridge dampers. The finite element model of the Puli Bridge was established by using ANSYS software. Under consideration of the pile-soil interaction, the cross analysis of 16 dampers with different parameters under the action of longitudinal + vertical earthquake was carried out. The bending moment and shear force at the bottom of the tower, the relative displacement of the tower and the girder, the maximum speed and the maximum damping force of the dampers under different working conditions are analyzed. Therefore, the suggested range of each parameter of a single damper is proposed.
Simplified Calculation Method of Wharf Bank Slope Stability Considering Old Piles
Authors: Liu Tianyun , Xie Linbo
Published: February 2021

Based on the requirements of durability, a simplified calculation method of wharf slope stability considering the anti-sliding effect of old piles is derived according to the allowable cracks of old piles. Firstly, the acting force between the sliding soil and the pile is assumed to be distributed in a triangle, and the position of the resultant force of each pile is determined. According to the maximum crack width limit of the old pile, the maximum bending moment that the old pile can bear is calculated. According to the maximum bending moment, the maximum horizontal force at the mud surface, where is the slip arc position, can be inversely calculated, then the maximum anti-sliding force provided by the old piles can be obtained, and the stability of wharf bank slope considering the anti-sliding effect of the old piles is checked. In the slope stability calculation of Beira fishing wharf reconstruction project in Mozambique, the simplified calculation method considering the anti-sliding effect of old piles is adopted. The stability coefficient of wharf bank slope meets the requirements, and the extra treatment of bank slope is cancelled, which saves the project investment and construction period.
Elastic-plastic time-history analysis of steel-tube stiff-frame arch bridge without inner filling concrete
Authors: Zhang Ben , Li Li , Su Wenming
Published: February 2021

Based on a case study of a typical arch bridge with hollow steel tube and stiffness frame located in the high intensity region of western China, this paper adopts the onlinear time- history method to analyze the structural response of the overall bridge elastic-plastic model under seismic action. Under the force of Wolong wave in Wenchuan Earthquake, the main load-bearing members of the structure have a good seismic performance. Only part of the columns on the main arch ring enter the plastic hinge state for energy dissipation, and the lower columns have a more obvious energy dissipation effect than the higher ones. The result indicates that the design idea of structure which is similar to that of strong column and weak beam in ductility design, has the characteristics of “strong arch and weak beam” and can therefore improve the ability of structure to resist collapse under earthquake action.
Time history analysis method for the combined action of extreme fluctuating wind and wave on the maximum double cantilever structure of rigid frame bridge considering the influence of flow velocity
Authors: Chen Yiqian , Peng Wei
Published: February 2021

Taking the maximum double cantilever structure of rigid frame bridge in construction period as the research object, the structural dynamic response analysis under the combined action of extreme wind and wave is carried out, considering the influence of flow velocity. An analysis method of short-term pulsation effect of a structure is proposed considering the influence of various adverse factors under extreme wind and wave conditions, which provides a reference for structural safety assessment under extreme conditions; The dynamic response results of the maximum double cantilever structure of rigid frame bridge show that the wave-flow effect under extreme wind and wave conditions will increase the structural response during the construction period, resulting in adverse effects.
Cause analysis and countermeasure of blockage in urea pyrolysis denitration system of coal-fired power plant
Authors: Yao Yongqi , Gui Sha , Yang Jiaxian , Wei Jianbo , Zhang Wen , Li Peipei , Xue Fangming , Su Jingcheng , Liu Xiuru
Published: February 2021

Due to the safety and convenience storage of raw materials and the maturing technology, the method of urea pyrolysis for ammonia has been widely used in the selective catalytic reduction (SCR) denitration technology of thermal power plants. However, crystallization and blockage phenomennons occured frequently, seriously disrupting the normal operation of SCR denitrification systems. In order to analysis the reasons of crystallization plugging in urea pyrolysis process, This paper collects and analyzes the scaling samples from pyrolysis furnace and spraying ammonia pipe to identify scaling substances, analyzes the reasons of urea crystallization, puts forward the improvement measures so as to guarantee the safety and steady operation of SCR-DeNOx system.
An investigation of pattern design of draped necklines
Authors: Kazlacheva Zlatina , Kosinkova-Stoeva Angelina
Published: February 2021

The paper presents an investigation of pattern design of this type of drapery with main idea easy and correct constructing. The aim of the work is development of a facilitating and accurate system of pattern design on the base of studying different constructional systems and finding a way of correct measurement with the help of approximation of the draped neckline with a parabola and a dependence, obtained by a multiple linear regression. The results of the investigation lead to easy and correct geometrical way of pattern design and easy and correct measurements of the draped necklines in ladies’ clothing. The dependence of measurements can be use not only with presented pattern design system but with every other way for constructing draped neck opening. The measures on the made prototypes show that there isn’t any additional length to the draped neckline as result of the skew direction (in the more times) and the weight of the fabric in the garments made from woven fabrics. But there is additional length of the draped neckline in the garments made from knitted fabrics, result of the stretchability in all directions. In the garments from woven fabrics stretchability in skew direction is balanced by lack of it in both basic directions, and by this reason the stretchability forms the drapery but does not add length to the draped neckline. Therefore, the obtained dependence of measurement of the draped neckline is suitable for garments from woven fabrics and a base for the future study about draped necklines in clothes from stretched materials.
Analysis of non-conventional (dry) sizing methods
Authors: Blagova E , Balabanova D , Paleva-Kadiyska B
Published: February 2021

The method of “dry” sizing has long been known, but has not received widespread industrial application due to the high cost of the sizing ingredients. A classification of the variants of this method is presented and the differences, advantages and disadvantages of each of them are revealed. An experiment was performed for sizing of threads by two of the variants of the method, determining some of their main characteristics and comparing them with those of threads sizing in the classical way.
Determination of limiting fibers blend irregularity
Authors: Ryklin D B , Navumenka A M
Published: February 2021

Aim of the research is obtaining formulae for determination of limiting blending irregularity of fiber assemblies on the base of simulation. Obtained formulae show the influence of the fibers properties and their percentage on blends irregularity and can be used for evaluating blending process efficiency. Comparison of actual blend irregularity and limiting values allows to asses potential opportunities of the process improving. It was experimentally proven that influence of fiber blends parameters on actual blend irregularity corresponded to obtained formulae.
Research of influence of blended yarn structure including stainless steel fibers on its properties
Authors: Medvetski S S , Ryklin D B , Davidziuk V V
Published: February 2021

Analysis of changes in the electrical resistance of different blended of yarns containing stainless steel fibers Bekinox® before and after plying very important for develop antistatic textile materials. Hypothesis was suggested that the plying of two strands leads to yarn conductivity increasing because of rise of the contacts number between stainless steel fibers on their surfaces. Producing of ring-spun 20 tex yarns and 2-ply yarns of linear density 20 tex × 2 were investigated. It is found that that the addition of 10 % stainless fibers into the yarn reduces its electrical resistance in 105 – 106 times. Experimental results show that after plying the yarn conductivity increases. However, this degree of this effect depends on the type of non-conductive fiber (cotton or polyester). Based on the yarn structure simulation it is proven that plying of two strands leads to yarn conductivity increasing because of rise of the contacts number between stainless steel fibers on their surfaces.
Constructing a hyperoperation sequence-pisa hyperoperations
Authors: Andonov A P
Published: February 2021

In the context of other hyperoperation sequences, a new sequence of operations is constructed. A review of its properties reveals dependences between pairs of numbers, and so the sibling numbers are established. Two theorems are proven and the connection to small base tetration is revealed. The problem of extending the sequence to real levels is considered and linked to tetration height extension. The pisa operations can be a useful tool for exploring tetration and large numbers.
Vegetation in Bulgaria according to data from satellite observations and NASA models
Authors: Todorova Mima , Grozeva Neli , Takuchev Nikolay P , Ivanova Dafinka , Kuzmova Kalinka , Kazandjiev Valentin , Georgieva Veska , Velichkova Radomira , Boneva Vanya
Published: February 2021

Introduction. The condition of the vegetation cover can be traced from Space. Aim of the research. To assess the condition of the vegetation cover in Bulgaria during the last twenty years – its distribution over the country, its change in connection with the typical climatic changes, its seasonal change. Material and methods. The vegetation index NDVI according to NASA data was used to analyze the condition of the vegetation cover in Bulgaria for the years 2000-2020. The methods used were: seasonal data decomposition, t-test, GIS methods for spatial representation of data, Fourier analysis. Conclusions. 1. During the summer months the vegetation in the eastern parts of the territory of Bulgaria is noticeably weaker than in the western parts. The influencing factors-drought and frequent fires are probably related to global warming. 2. For the territory of Bulgaria there is a seasonal rotation of the horizontal gradient of the vegetation index in a counterclockwise direction-from east to west in summer, from northeast to southwest in autumn and from north to south in winter. 3. There is a winter increase in vegetation for Northern Bulgaria and to the greatest extent for Northeastern Bulgaria, as well as for Southwestern Bulgaria. Together with the decreasing snow cover, the winter vegetation contributes to the drought in the eastern parts of the country.
Adaptive technologies for training of specialists
Authors: Yelnykova H , Ryabova Z
Published: February 2021

The article is devoted to the organization of the educational process of specialists’ training by means of the adaptive teaching technologies. We have described the philosophy of instability that underlies such technologies: from chaos to self-organization. By showcasing the concepts of adaptation and adaptability, we define the content and stages of adaptive technology. The article presents the results of monitoring the trends of respondents’ awareness of the technologies of using the Bloom’s taxonomy in professional activities, which are necessary for the formation of the educational program of specialists’ training. Considering that the Bloom’s taxonomy strengthens the learning processes of applicants.
Application of a method for calculating the sizes of perspective objects
Authors: Bankova A I
Published: February 2021

Determining the parameters of perspective images of different objects is a complex problem. Graphic, graphoanalytical and analytical methods are used to solve such problems. Graphic methods are not accurate enough for complex objects compared to analytical methods, which although difficult to apply, are proved to be the most accurate ones. Graphoanalytical methods according to are considered the most appropriate in terms of accuracy and complexity of application. The purpose of this paper is to propose a graphoanalytic method for determining the parameters of perspective images of a parallelepiped. The coordinates of the points which are the vertices of the perspective image and the equations of the lines on which the edges of the perspective image lie are determined both by applying the knowledge of constructing a perspective image and that of analytical geometry.
Change from one Method to Another for Processing by Cutting a Complex Rotary Surfaces
Authors: Vasileva D , Lefterov E
Published: February 2021

Many authors involved in the processing of materials by cutting make different definitions for complex rotary surface. They are reduced to the definition published in [1]: A complex rotating surface is called one that is composed as a combination of two or more of the following elementary surfaces - conical, frontal, cylindrical, curvilinear. The methods and devices used in machining parts that are constrained by complex rotary surfaces depend on following several factors: type of production (single, serial, mass); type of available equipment and shape accuracy and surface quality.
Potential for the regional energy supply system optimization through recycling waste into energy
Authors: Tulegenova A A , Andreenko T I , Rafikova Yu Yu
Published: February 2021

The use of renewable energy sources is becoming a general trend for optimizing energy supply and achieving low-carbon development goals in various regions of the world. In Russia, in connection with the introduction and implementation of government support measures for solar, wind, bioenergy, starting in 2013, a large-scale introduction of energy-generating facilities began. This factor, as well as the need to solve the problem of recycling waste from the municipal sector, agriculture and forestry, makes it necessary to use local renewable energy resources, including waste. This approach helps to optimize the regional energy system, even if they are grid connected. The paper discusses the methods and potential for optimizing energy supply in the regions of southern Russia, which has a high population density, a significant deficit in energy balance, and problems in the field of solid waste processing. The basis for this work is the use of municipal sector waste as an energy resource, with an assessment of the economic and environmental efficiency of this process. The use of geoinformation technologies provides a spatial analysis of the resource potential, a comparative analysis of the distribution of energy production and consumption within the region, as well as helps to assess the availability of territories for the optimal placement of solid municipal waste processing facilities.
Modal analysis of the nozzle guide vane in low pressure turbine system of aircraft engine
Authors: Robak R , Szczepanik M
Published: February 2021

The aim of the article is to present modal analysis of nozzle guide vane in low pressure turbine system of aircraft engine. Comparison of results obtained by means of finite element analysis with results of experimental one in terms of frequencies and modal forms are presented. Additionally, the article presents consistent results which will be used in further analyses and researches related to the optimization of dynamic characteristics with application of artificial intelligence.
Drivability improvements obtained using a mild hybrid electrical system on a vehicle equipped with a manual gearbox
Authors: Saragea Ștefan , Frățilă Gheorghe , Badea Gabriel
Published: February 2021

In order to fulfil the latest and future emission standards, all vehicles will need to be equipped with hybrid powertrains or advanced depollution systems. For low cost and entry level range of vehicles, in order to keep the production costs low, the simplest choice of hybridization is the mild-hybrid system with integrated starter-generator (ISG). This paper contains a model of a mild-hybrid electric vehicle equipped with a manual gearbox with focus on the drivability performance of the powertrain. The goal of this paper is to find out the drivability performances of a hybrid vehicle by simulation and to show the improvements compared to a similar vehicle equipped with a conventional powertrain.
Aerodynamic shape optimization of racing car front wing
Authors: Kalinowski M , Szczepanik M
Published: February 2021

Nowadays, the automotive industry is one of the largest areas of CFD (Computational Fluid Dynamics) simulation applications. The big challenge that engineers dealing with CFD simulations in this industry have to face is shape optimization, which is often very time-consuming and requires a lot of iterations. To reduce the time needed to achieve an optimal shape and make the design process more efficient, more and more CFD analysts are turning to Adjoint Solver (AS) formulas, a new methodology used for optimization in the automotive as well as railway industry. The AS method calculates gradients (directions, quantities) directly by solving conjugate equations, which makes them independent of design variables. The article concerns optimization the shape of the front wing of the racing car in order to obtain the highest possible downforce-to-drag ratio. At the beginning, 2D shape optimization of the front wing was performed. The next stage of work was the preparation of a CAD (3D) model that took into account the change in the shape of the wing, obtained during the optimization process, and then performing a flow analysis for it.
Distribution of resources for equipping handling fronts in rail consolidation terminals
Authors: Stere A Ș , Roman E A
Published: February 2021

An indispensable factor of the socio-economic life, the transports realize the connection between the economic zones, which facilitates the attraction of all the companies to the economic circuit, to the capitalization of the available resources and to their overall development. The influence of transport volumes is clearly manifested on the capacity of the terminals, the number of means of transport necessary to satisfy the demand, the degree of their use, the economy of the goods handling installations, the capacity of the handling fronts and labour productivity. Therefore, it is of a great importance to design the constructions and equipments of the terminals according to a criteria based on the optimal structure of the technical endowment subject to variations in the volume of transport activities. The present paper aims to present a theoretical framework for the distribution of resources for equipping handling fronts of the rail terminals. A mathematical model and a algorithm based on the projected gradient method are developed to solve this problem.
Software application for optimizing raw material costs, including materials recovered from batteries and accumulators
Authors: Florea B , Marcu D , Ioana A , Semenescu A , Solea R , Iacob G , Niculescu F
Published: February 2021

In this article we aim to create a software application aimed at highlighting the importance of the technical and economic estimate in making the bushings. This software was created as a web platform, available at: https://www.bucsa-sim.com, in order to maximize the accessibility, speed and efficiency of the complex process that underlies the construction of parts, in our case, bushings. The idea of developing this software started from the necessity generated by the fact that currently there is only one website on the Romanian market available at: https://bucsebronz.ro/calculator-piese/, which does not allow users to calculate the technical-economic estimate in real time, but only to send a simple form to the company. The use of this application is part of the new concept of Industrialization 4.0 because it allows operation in the cloud with immediate access to the display of the price of a bushing made of elements recovered from waste. Taking into consideration that materials such as copper and lead can come from recycling of batteries and accumulators, this application contributes to a better integration of the processing of these materials in the priciples or the circular economy.
Forecasting technique of radio information system characteristics for optimal technical condition of the space control system components
Authors: Korneev N V , Merkulov V D
Published: February 2021

The paper proposes a forecasting technique of radio information system characteristics for optimal technical condition of space control system components, using a recurrent neural network and information tools from an early-warning radar stations group and Russian Aerospace Forces optical-electronic stations when determining the optimal technical condition of the Space Monitoring System (SMS) components. Analyzing values of time series by a recurrent neural network LSTM-based model with various parameters, we propose an algorithm for solving problem of forecasting characteristics of a radio information complex. The network architecture is a two-layer network with one layer of LSTM cells and one fully connected layer. There are results of experimental forecasting by pre-training the recurrent neural network (RNN) model sampling 1080 normalized measurements of a conditional sensor of 30 minutes apart. The training sample is made of conditional sensor normalized values for 9 hours continuous operation. The algorithm for the model training and creation is implemented in Python language using open source library TensorFlow. Experiments were performed with different values of the forecast horizon and the length of the input sequence of time series values. We obtained: the total average error for each combination of parameters, the dependence of the average forecast error on the used parameters and the dependence of the average (for all forecast values) forecast error on the period of the analyzed sensor values.
Verification of mathematical models to optimize the composition of radio-absorbing polymer composite materials
Authors: Markov A V , Oreshina O A
Published: February 2021

At present, radio-absorbing dispersed-filled polymer composite materials have become widespread in aviation technology. These materials are used to protect electronic units of on-Board equipment from electromagnetic radiation. The article considers the need to develop mathematical models of the dependence of the composition of radio-absorbing polymer composite materials on their physical and mechanical properties. The article deals with the optimization of a group of physical and mechanical properties described by mathematical models in order to obtain the optimal composition of a radio-absorbing dispersed-filled polymer composite material based on heat-resistant low-molecular synthetic rubber with the addition of untreated ferric oxide as a filler. The research method is optimization by the method of successive concessions. Computer experiments were carried out to optimize the composition of materials. The performed calculations were checked by experimental data, the adequacy of the obtained models was checked.
Simulation model for predicting reciprocating internal combustion engine wear
Authors: Malozemov A A , Kozminykh D V , Malozemov G A , Shavlov A V
Published: February 2021

The article presents the results of software development, using the Modelica language, designed to create and use simulation models as part of reciprocating internal combustion engines digital twins. The software was created on the basis of component, system and declarative approaches, the theory of a casual bond graphs. The software includes submodels for determining the main engine parts wear rate and allows to predict engine parts life time, to simulate normal and accelerated engine reliability and durability tests. In the course of the study, the well-known model for determining mechanical frictional losses SLM (Shayler, Leong, Murphy, 2005) was adapted to calculate the relative change in the wear rate of engine parts. Universal equations are obtained to determine the friction forces as applied to rotationally and reciprocally moving engine parts. A method is proposed for calculating the relative change in the wear rate of parts and the time of failure due to wear, taking into account the physical properties (hardness), geometric dimensions and the speed of the relative movement of parts in the conjunction.
Mathematical model of changing the combined cutting tool durability
Authors: Sokolova I D , Beckel L S , Pilipushko A Yu
Published: February 2021

The article provides information on the development and study of a mathematical model for changing the durability of a new progressive combined tool. Currently, one effective way to increase productivity in automated manufacturing is to concentrate operations or transitions. With a high degree of operations concentration, the complexity of the kinematics of the equipment increases, its reliability decreases, therefore, downtime and the production cost are rising. The transitions concentration leads to the tool design complexity increasing, while the equipment can have simple kinematics of movements. The compatibility of operations or transitions depends on the required machining accuracy and surface roughness. The accepted procedure for performing operations and transitions determines necessary tool type. The most efficient concentration of operations or transitions can be achieved by using combined tools. Combined tools can be used in the treatment of both stepped and smooth cylindrical holes, which make up 35% of all surfaces used in mechanical engineering. Therefore, this study is devoted to solving the problem of increasing productivity and reducing the cost of threaded holes processing through the use of a new combined tool called the drill-tap.
Impulse mode of physical and technical gases parameters control based on the jet force action effect
Authors: Makarov V A , Korolev F A , Tyutyaev R E
Published: February 2021

This paper presents the results of research on the use of the jet force action effect for physical and technical gases parameters monitoring systems and devices. Authors considered and proposed the impulse mode of physical and technical gases parameters control based on the jet force action effect, which provides high accuracy and sensitivity measurements, and presented possible control devices based on the use the impulse mode of physical and technical gases parameters control: the density sensor used for single-component gases parameters control and the sealing capacity control sensor used for binary mixtures parameters control. For each device were determined static characteristics and the physical, technical and design parameters, which ensure a high level of sensors accuracy and sensitivity.
Transportation and logistics system for preparing areas to unload material resources in the absence of port infrastructure
Authors: Kravets Yu D , Shuvalov D V , Yermoshin N A
Published: February 2021

The transport system of any state is a determining link in the development of the economy, the implementation of internal and external political and military goals. At the same time, in most countries, water transport is one of the key modes of transport pursuing state interests. Despite the fact that recently the development of remote territories has reached a fairly high rate, the full development of the port infrastructure does not always meet the needs of logistics enterprises and organizations. At the same time, the need to unload material resources to the unequipped coast has sharply increased. The issue of improving technologies and developing technology in organizing the unloading of material resources on an unequipped coast has been discussed for a long time, however, a solution that satisfies the need for organizing the unloading of material assets, taking into account all the features, has not yet been found. The article proposes the author’s conceptual approach to improving the process of unloading material resources on an unequipped coast, which consists in using a completely new transport and technological system for preparing unloading areas, affecting all the constituent elements of the process: vehicles, transmission links and coast.
A methodological approach formation to assessing the compliance degree with the requirements and the achieving it cost at the product life cycle stages
Authors: Kirov A V
Published: February 2021

Currently, industrial enterprises and operating organizations is in the development process and the products’ system life-cycle management formation. In this system, the compliance assessment and cost analysis on product quality are the main objectives. Under ISO 9000 series standards, product cost assessment is one of the enterprise quality management system basic elements. To do this, product quality costs must be set, processed and analysed in the same way as other costs. At the moment, there are different approaches to determining the quality products cost that is not effective enough. The presented work has developed a methodical approach that can be applied in assessing the products’ life cycle total cost and determining the “price-quality” effectiveness type.
Aircraft life cycle management system architecture for solving cost management tasks
Authors: Gyazova M M , Gorelov B A
Published: February 2021

The article is devoted to cost management issue in the aircraft life cycle management system. In a theoretical analysis, the authos consider the main cost management components, the main automated systems used in the modern integrated information space and the universal scheme of using automated systems at product life cycle different stages for effective cost management problems solving. The research part of the article is based on production cost management scheme development, as well as the aircraft life cycle management system architecture formation, which allows solving cost management tasks, including during aircraft operation phase.
The induction heating process modelling of the waveguide paths’ flanges
Authors: Milov A V , Tynchenko V S , Kurashkin S O , Petrenko V E , Rogova D V , Tynchenko Ya A
Published: February 2021

The article presents mathematical heating model the flange is in process induction soldering of waveguides paths. In the quality of object of research stands out creation process all-in-one connections based on induction heating, or more precisely, patterns distributions energy over time by default flange size waveguide the route. Goal creating a model consists of in the upgrade process quality of management technological equipment process production facilities antenna-feeder devices based on the induction soldering technology. Developed by models can be used for adaptive management technological equipment process induction system soldering when production waveguide paths assemblies.
Similarities of the total electron content behavior during geomagnetic storms
Authors: Maltseva O , Nikitenko T
Published: February 2021

The study of the behavior of the ionosphere during disturbances is traditionally an important task. One of the authors in the GA 2018 paper found two groups of similar magnetic storms in 2013 and discovered a similarity in the behavior of the critical frequencies foF2 according to the data from the Sodanküla high-latitude station in the northern hemisphere, but this similarity was reduced to a negative disturbance, which is also characteristic of a large number of dissimilar magnetic storms. Nevertheless, it seemed interesting whether such a similarity could be inherent in the behavior of the total electron content TEC of the ionosphere. The study was carried out using data from three stations Juliusruh, Tromso, Longyearbyen near the 15° N meridian. It turned out that this similarity is observed in the behavior of foF2 and TEC, which is confirmed by high correlation coefficients between these parameters both during months and periods of disturbances.
Method for constructing a network of urban roads using satellite images
Authors: Vikhtenko E M , Tusikova A A
Published: February 2021

An automatic method for recognizing the urban network of highways on high-resolution satellite images has been developed and implemented, based on the use of the Mask-RCNN convolutional neural network. The results of the neural network operation are post-processed by the Hough transformation and algorithms of mathematical morphology. The proposed method has acceptable accuracy and high speed of detection of asphalt urban roads.
Finite-differential models used as a basis for IT support in problem-solving
Authors: Zatonskiy A , Sirotina N , Bazhenov R , Altukhova I , Alutina E
Published: February 2021

The study confirms that the forecast quality of social-economic indicators estimated with multiple linear models does not often seem to be satisfactory. The coefficients of regression-differential models are poorly interpreted economically. This paper covers the issue of improving the forecast quality by modifying regression-differential models to the sum of linear and autoregressive models. For brevity, the resulting models are called finite-differential models of the first-and second-orders, respectively. The authors use the coefficients of multiple linear models for an initial estimate when they determine the unknown coefficients of finite-differential models. The performance of the suggested method is tested with 60 sets of statistical data. The study proves that the use of the first-order finite-differential model results in the significant increase in the quality of forecasting and reduction of the approximation error for 65 per cent of cases, and there are 80 per cent of cases when a second-order finite-differential model is used. This indicates that the authors suggest a valid modification of the algorithm for determining the coefficients of models so that it can be used in further research
Belt conveyors: principles of building control and diagnostics systems
Authors: Dzhundibayev V E , Kochetkov A V , Bobeev A B
Published: February 2021

Diagnostics allows you to get information about the technical condition of the main components of the belt conveyor, the results of which the control system adapts to changing conditions. Diagnostics is carried out by technical means of diagnostics and assessment of transport and operational condition. The main provisions of the conceptual plan and functional properties of advanced diagnostic systems are developed. The requirements for software and hardware and data bank for diagnostics of the state of belt conveyors are defined.
Effect of ferromagnetic shunt manual armature return polarized electromagnet on electromagnet power performance
Authors: Zaitsev N Yu , Ivanova S P , Nikolaev N N , Petrov V N , Svintsov G P
Published: February 2021

Using the FEMM program, models of a neutral electromagnet, a polarized electromagnet without a shunt and a polarized electromagnet with a shunt for manual armature return to the initial position have been developed to study a shunt effect on an electromagnet power characteristics. It has been established that the polarized electromagnet anchor attraction electromagnetic force without a shunt at a critical (initial) working gap is 1.44 times greater than that of a neutral electromagnet. A polarized electromagnet with a shunt armature attraction electromagnetic force with an initial gap is 1.1 times less than that of a polarized electromagnet without a shunt. The shunt initial and final positions influence investigations on the armature attraction electromagnetic force magnitude have been carried out. It is shown that in the armature final position and the shunt initial position, the armature attraction force from the permanent magnet is sufficient to keep the contactor contacts closed. When the shunt is moved to the end position, the force from the permanent magnet is not enough to hold the armature in the pulled position and the condition is provided for opening the contactor contacts. Studies have confirmed that a ferromagnetic shunt, designed to manually return a polarized electromagnet armature to its initial position, the contactor in normal operation leads to a decrease in the drive electromagnet magnetomotive force.