bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the Wear Intensity Ratio of a Striker under Dynamic and Static Conditions
Authors: Bolobov V , Chupin S , Binh Le Thanh 
Published: April 2020

Abstract
The results of experiments on determination of the cylindrical part mass loss of the cone-shaped strikers made of 38XM (AISI P20), У8 (AISI W1-A), and X12MФA (AISI D2) steels, which have been subjected to heat treatment applied by the striking tools manufacturers, and additional cold treatment, with their friction and abrasive wear on granite, are presented. It was found that the strikers made of steel X12MФA with all types of heat treatment show the greatest wear resistance under the wear conditions (static conditions), while the strikers made of 38XM have the lowest wear resistance. Cryogenic treatment and, to a lesser extent, cold treatment increase the wear resistance of all materials. The comparison of set values of wear resistance I
st and hardness HV of the strikers, as well as the analysis of their microstructure allows to conclude that wear resistance of a tool depends not only on its hardness, but also on the type, volume, shape of carbides forming the structure of material used for tool manufacturing. For this reason, after the cryogenic treatment, the tool made of X12MФA steel shows the greatest wear resistance, because its material has the highest content of carbon (∼1.5%) and alloying elements (∼13%), which provides up to 10.8% increase in the number of fine carbide particles in its structure, that ensure wear resistance increase, after the cold treatment. The results obtained for I
st are compared with the earlier obtained data on wear resistance of the same striker at striking upon granite (in dynamic conditions). The conclusion about similarity of the wear mechanisms of the analyzed strikers in dynamic and static conditions is made.
High Frequency Vibrations Arising in System Wheel-Rail. Part I. Mathematical Modeling of the Distribution Stress in Contact Zone Wheel-Rail
Authors: Gridasova E , Loktev A 
Published: April 2020

Abstract
This study is devoted to study of most used existing models of contact two solids, in relation solution of problem dynamic interaction of wheel pair and the rails. In paper also proposed and approbate a new relationship to connect force of interaction, deformation of local indentation, displacement of contacting bodies, their mechanical and geometric characteristics, as well as the parameters of condition during operation in different modes. The stress isolines at point of interaction wheel-rail on straight section of track without taking into account the defects of the contacting bodies are obtained.
Adaptive Process Control System of Fine Turning with the Use of Vibroacoustic Signal on CNC Machines
Authors: Ostapchuk A K , Kuznetsova E M , Karpov E K 
Published: April 2020

Abstract
One way to improve the quality and accuracy of machining is a method based on intervention in the process course. Adaptive control is a promising direction of process control. The creation of machines of high accuracy and rigidity, high resistance tool, the development of active control has led to the fact that the role of the dominant factors that generate processing error, were random factors and primarily such as the fluctuation of the allowance and hardness of the workpiece material, as well as the wear of the cutting tool and the condition of the equipment. The actions of these factors are the main reason that prevents the quality improvement and processing productivity.
The aim of this work is to study the possibility of using the vibroacoustic signal as an information source for the structure and algorithm development of the finishing turning process adaptive control system.
It is established in the work that the signal generated by the technological processing system is random when finishing turning parts from hard-to-process materials. As an information signal for the technological processing system diagnosis, the most promising will be the use of an acoustic signal that directly accompanies the process of parts mechanical processing. Experimental dependences of roughness parameters and vibration signal parameters on cutting conditions (tool feed, spindle speed) and tool wear are presented. The calculations carried out in the work showed that there is a correlation between the vibration signal parameters and the parts surface roughness parameters. The correlation coefficient between these functions reached 0.75…0.85. Therefore, by controlling the level of the vibroacoustic signal, it is possible to estimate the output parameters of the machining process.
On the basis of the conducted researches the adaptive control system structure variant is offered, the information source for which is the vibrations Converter occurring in technological system.
Synthesis of Magnetic Particles Using Electric Explosion of the Wire at the Boundary with the Liquid
Authors: Ermolaev A , Okhulkov S , Titov D , Titov E , Razov E 
Published: April 2020

Abstract
The article describes an installation for producing nanopowders by the method of electrical explosion of a wire. The powders are supposed to be used as a basis for magnetorheological fluids. The article describes the functional installation and the model of the power converter. The electric explosion of the wire was carried out at a voltage of 500 V and 1000 V. The experimental data coincide with the results of the study on the model. The pulse duration is ∼ 10−4 s, and the power is in the range from 1.5 MW to 4 MW. Spherical particles are obtained in the size of 500-5000 n with such parameters of an electric explosion. The surface of the particles was examined on a Tescan VEGA II electron microscope.
Determination of the Dynamic Rigidity of Magnetic Controllable Hydromount Dependence on the Frequency of Vibration
Authors: Gordeev B , Okhulkov S , Ermolaev A , Titov D 
Published: April 2020

Abstract
Building damping characteristic of magnetocontrollable hydromounts and their correlational relationship with dynamic rigidity is considered in this article. Damping characteristics of hydromounts primarily comprise their amplitude-frequency characteristics (AFC). Building damping characteristics of magnetocontrollable hydromounts unaffected by magnetic field was performed basing on vibration tests data on vibrostand Star28, generating broadband random vibration (Random), in order to determine their resonance frequencies at 50 m/s2 input root-mean-square vibration acceleration (RMS).
Free Transverse Oscillations of a Continuum-Discrete Vertical Rod
Authors: Kulterbaev Kh P , Baragunova L A , Shogenova M M 
Published: April 2020

Abstract
The spectral problem of transverse oscillations of high vertical continuum-discrete rods is considered, focused on the application of results in the problems of seismic oscillations. A mathematical model of free oscillations representing the boundary value problem for the hyperbolic differential equation is obtained, which is reduced to the Sturm-Liouville problem by the method of variable separation. Application of finite difference and coordinate descent methods in combination with visualization of calculations in Matlab environment gives own values and attenuation coefficients and further own functions.
Hygienic and Ecological Justification of Natural Light Transportation System in the City of Tyumen
Authors: Sukarnaeva G A , Sulkarnaeva L D , Bulgakova E V 
Published: April 2020

Abstract
This paper performs the assessment of the effectiveness of organization of natural light transportation in Tyumen Region, describes the primary natural light transportation systems: light lanterns, solar tents, glass roofs, Solarspot systems, light wells; determinates advantages and disadvantages of natural light transportation systems implementation, analyses the results of simulation of upper, lateral and combined lightning and measurements and assessment of the illumination and the coefficient of natural illumination, as well as studies on the light transmission ability of corrugated glass under the open sky; using hygienic and ecological arguments, justifies the usage of natural light transportation for the city of Tyumen; considers the possibility of the installation of mirrors for Tura River embankment.
The Method of Obtaining Non-Autoclaved Aerated Concrete by Hardening of Ironportland Cement, Porous with Calcium Polysulfide and Hydrazine
Authors: Elesin M , Mashkin N , Klimova S , Atlasov R 
Published: April 2020

Abstract
The physicochemical basis of hydration hardening of a slag portland cement mixture in a polysulfide-containing alkaline broth with the addition of hydrazine as a gasifier is studied. The combined action of the CaSn - N2H4 pair provides for the porization of the hardening mass and the increase in the hydraulic activity of the binder mass.
Method for Evaluation of Fibrous Structure Materials’ Drapability
Authors: Sheromova I A , Dremlyuga O A 
Published: April 2020

Abstract
The object of the article’s research is fibrous structure materials, and the subject is the method of evaluation of their drapeability. The aim of the work is to develop a new method for evaluating textile and leather materials drapability. This method is categorized as an express method, involving the use of digital technologies in research, processing of results and the possibility of forming an electronic database of the characteristic properties of the materials. The existing methodological and technical-technological approaches to determining the characteristics of mechanical properties during bending deformation were analyzed. The possibility of using wave processes in determining drapability were theoretically justified and a new method for the assessment of drapability was developed. The developed method is intended for the study of textile and leather materials. As an informative parameter in evaluating the drapability, it is proposed to use the parameters of quasi-resistant transverse vibrations generated in a certain direction on a standard size material sample. Taking into account the time spent on the experiment, the developed method can be categorized as an express method with the ability to generate an electronic database on-line. The results of the practical approbation of the proposed method for evaluating drapability, obtained by comparing the estimates formed on its basis with the data obtained based on the widely practiced method, suggest sufficient accuracy and the possibility of applying the developed research method.
Approach Heating Processes in Multiphase Gas-Hydraulic Damper
Authors: Ermolaev A , Okhulkov S , Plehov A , Titov D 
Published: April 2020

Abstract
The article proposes a mathematical model of temperature control of a multi-phase gas-hydraulic vibration isolator due to application of gas-regulated heat pipe. During the operation of the vibration isolator with magnetorheological transformers, mechanical energy is absorbed, which is converted into heat. The use of a gas-controlled heat pipe ensures the removal of heat from the object, the creation of an isothermal zone inside it and the temperature stabilization of the object. This ensures the preservation of the working properties of the magnetorheological fluid, in particular, its viscosity, and practically stabilizes the parameters of the amplitude-frequency characteristic of the vibration-insulator, regardless of the time of continuous operation and the ambient temperature. The article presents experimental methods for determining the thermal coefficient and rate of heating of a vibration-isolator, which allows making reasonable design decisions in the design of vibration protection systems.
Study for the Informal Settlement Supposed to Be Distributed by the Iraq Government for Poor People in Baghdad City - Republic of Iraq
Authors: Al-Jawari S M 
Published: April 2020

Abstract
This paper set forth the spatial suitability of the informal settlement supposed to be distributed by the Iraqis government to poor people. The Iraqi government identified 9 locations of informal settlement in Baghdad city and acceptance it as a reality as a help for them to getting home. In this paper I discovered the suitability of those locations which one will be suitable more than others for living. The analysis process was applied using the GIS environment – spatial analysis. According to the results, It has been identified as the most important measures to identify which one of these areas suitable for development for housing by using some criteria (Distance from the city center, Proximity from transport routes, Proximity of high voltage lines, locations from Railways, Location from oil and gas fields, the location from the river, the location from water services) and recommends the procedures to be carried out for the purpose of developing the informal settlement, so as to help decisions maker to select the more appropriate of those slums.
The Effect of Urban Form on Temperature for Hot Arid Zones. The Case Study of Baghdad, Iraq
Authors: Al-Mosawy S K A , Al-Jawari S M , Al-Jabari A A 
Published: April 2020

Abstract
The research aims to determine optimal urban planning and design indicators of the urban clusters form in hot arid zones through studying of three urban areas in Baghdad, analyzing their urban indicators which include floor area ratio (FAR), urban clusters height, building density or land coverage, green areas, paved areas, shading ratio and how they affect urban temperature.
The research reached the conclusion that air outdoor temperature on urban areas affected primarily by shadows casted on the ground, the effect of shaded area equals (5) times the effect of paved areas and (3.7) times the effect of green areas, this means that increasing urban clusters height in hot arid zones could minimize air outdoor temperature, buildings with (6) levels at minimum seems to be suitable to produce shadows in the ground plane of urban land, Increasing urban volumes in the vertical dimension height and compacting clusters or increasing FAR seem to be a smart strategy to minimize the hot dry climate effect and urban temperature.
Phase Composition and Magnetic Properties of Fast-Quenched Co-Sm-La and Co-Sm-Ce Alloys
Authors: Biragova N F , Mishenina I V , Peikarova N I 
Published: April 2020

Abstract
The intermetallic compounds of rare-earth metals (REM) and iron triad metals have unique properties that are increasingly exploited in cutting-edge technology both as individual materials and as phase components that give the alloy its desired properties.
Of greatest interest are the intermetallic compounds (IMC) of cobalt based on light REMs. Proper processing imbues these compounds with considerable coercivity on the order of 104E. Thus, spinning that is used for the superfast quenching of melts (v=106 K/s) can produce intermetallic compounds in microcrystal state, in which crystals have distorted crystal lattices. In such cases, phases have high coercivity. Experimentally obtained magnetization and coercivity values of fast-quenched alloys (FQA) in the Sm2Co17 plane of Co-Sm-La and Co-Sm-Ce systems are significantly higher than the equilibrium values.
Estimation of the Service Lifetime of Layered Heat-Resistant Ni-Al and Ni-Cr-Al Coatings
Authors: Taube A O , Shmorgun V G , Bogdanov A I , Storozheva E I , Solovev D B 
Published: April 2020

Abstract
This paper describes the method and results of calculation of the service lifetime of layered heat-resistant Ni-Al and Ni-Cr-Al coatings by known empirical methods. It is shown, that alloying the Ni-Al system coatings by Cr leads to a five-fold increase of durability at high temperatures.
Electrothermal Devices for Gas-Thermal Processing of Structural Metals and Alloys
Authors: Rodionov I , Perinskaya I , Kuts L 
Published: April 2020

Abstract
The provided designs of cylindrical electric resistance furnaces were designed to strengthen the heat treatment of a wide range of metal products with various applications. Special-purpose electric furnaces allow carrying out strengthening heat treatment of metal and alloy surfaces in reaction process medium comprising air, superheated water vapour, a mixture of inert and oxidising gases with the formation of thermal oxide coatings with increased indicators of both wear and corrosion resistance.
Research of Properties of Cast Austenitic Steels for Low-temperature Equipment
Authors: Vologzhanina S A , Ermakov B S , Peregudov A A 
Published: April 2020

Abstract
This paper considers the possibility of using Cr-Ni, Cr-Ni-Mn and Cr-Mn cast metastable austenitic steels with alloying systems of the grades 12Cr18Ni10TiL, 10Cr14Mn14Ni4TiL and 10Cr14NMn20L for the manufacture of complex-shaped parts for use in equipment operated at low temperatures. The results of tests to assess the characteristics of strength, ductility and toughness of austenitic steels in the cast state in the temperature range from plus 20 to minus 196 ° C are presented. The obtained data allow us to estimate the change in the values of the mechanical properties of cast asutenite steels with decreasing test temperature. Based on the analysis of the results obtained, recommendations were given on the use of austenitic steels in a cast state for low-temperature equipment at various operating temperatures. It is shown that metastable austenitic steel 10Cr14NMn20, in comparison with other studied steels, despite relatively low values of plasticity, has higher values of strength and toughness at mines 196 ° C and can be recommended for the manufacture of cast parts of low-temperature equipment.
Increasing Methods of the Car Valve Tappets Durability
Authors: Shveyov I A , Shveyov A I , Shveyova E I 
Published: April 2020

Abstract
It is established that the admissible size of wear on the restored cemented (nitrocemented) details depends on specifications on operation of the car. An indispensable condition at the same time is preservation in a blanket (a worn-out detail) of carbon not less than 0,4%. It is offered for high-speed heating of worn-out parts of details under plastic deformation to use induction installation and the offered method of restoration of pushers of valves I have shown that details meet specifications of manufacturer.
Numerical Simulation of the Force Analysis of Gas-Solid Two-Phase Sepiolite Particles in a Horizontal Pipe
Authors: Zheng Chenchen , Zhou Youhang , Liu Wei , Li Yuze , Zhu Wenmu 
Published: April 2020

Abstract
In order to study the force that sepiolite particles exert in a horizontal pipe, a method for analysing the simulation of the two-way coupling of gas-solid two-phase flow of sepiolite particles has been proposed in this paper. A three-dimensional model of the gas-solid two-phase flow of sepiolite particles was constructed, based on the Discrete Element Method (EDM). In this model, the force and motion of the sepiolite particles were established according to Newton’s second law, turbulent flow was simulated using the k-ε model, and the two-way coupling correlation between the sepiolite particles and the turbulent flow was established according to Newton’s third law. Through numerical simulation of the gas-solid two-phase flow of sepiolite particles in a horizontal pipe, the distribution of both the velocity and pressure were obtained. In addition, the properties of the gas-solid two-phase flow of sepiolite particles were obtained. The results of the simulation demonstrated that the main forces acting on the sepiolite particles in a horizontal circular pipe in a turbulent state were drag, lift, gravity and the buoyancy of the particles. It was found that the Basset force, the Magnus force, the additional mass force and the pressure gradient force had a negligible influence on the movement of the sepiolite particles.
Finite Element Model Modification of an Arch Bridge Based on Response Surface Method
Authors: Wang Yu Bin , Wang Lei 
Published: April 2020

Abstract
Usually the structure of the initial finite element model can not reflect the actual situation of structure, the finite element model updating is for the initial finite element model of the structure, according to the static and dynamic response of the structure of the measured optimize the model parameters are adjusted, the revised model response is more close to the actual structural response, so as to get a more accurate finite element model. In this paper, the finite element model of the bridge is updated by using the second order incomplete polynomial response surface model. Then determine the sample data, use the least squares method to fit the undetermined coefficients of the second-order incomplete polynomial, and perform the accuracy test. Then the objective function based on frequency is constructed, and the updated optimal design parameters are obtained by quadratic sequence programming. Finally, using the optimal design parameters for modal analysis, it is found that the frequency error has decreased. It is proved that the correction by the response surface method (RSM) can improve the accuracy of the finite element model.
Preparation and Properties of Five Biomass-based Melamine Modified Urea Formaldehyde Resins
Authors: Xu Shanfeng , Chen Yuzhu , Xiao Hui , Fu Chengang , Tan Hailu , Gu Xinyue 
Published: April 2020

Abstract
In this paper, shell (PS), rice husk (RH), rapeseed stalk (RS), toonaciliata wood (TW) and Sinocalamus affinis (SA) were served as the modifier to modify the melamine modified urea-formaldehyde resin (MUF). The PS, RH, RS, TW, SA were ultra-fine crushed to be the powder with less than 48 um. The reactivity of PS, RH, RS, TW, SA and formaldehyde solution was measured, and PS, RH, RS, TW, SA were added in the third stage of synthesis process of the MUF resin. The basic properties of the resin and plywood were tested. The results showed that, with addition of the PS, RH, RS, TW, SA, the reactivity with formaldehyde solution became better, while the gel time became longer, the resin viscosity and the solid content increased, and the free formaldehyde content of the resin decreased. The formaldehyde emission of the plywood decreased by 60.53%, 48.25%, 41.23%, 44.74%, 56.14%, respectively, and the wet ply strength of the plywood increased by 40.00%, 56.19%, 16.19%, 24.76%, 54.29%, respectively. The use of the ultra-fined PS, RH, RS, TW, and SA showed good effects on the formaldehyde elimination of the MUF resin.
Design of a Challenge Robot Based on Single-Chip Microcomputer
Authors: Li Tianhui , Zhang Chengliang , Zhou Guozhi , Shi Luo 
Published: April 2020

Abstract
The Taiwanese robot is a robotic confrontation event that has emerged in recent years. This paper proposes a design scheme for the challenge robot. This new type of challenge robot was introduced from the control device, drive device, signal acquisition device and process design of the robot, and the mechanical analysis of the key parts of the robot was carried out. Through a large number of experimental tests and competition verification, the overall structure of the robot is reasonable and the stability is high, which can quickly knock down or push down the other robot.
Study on Infrared Radiation Characteristics of Granular Mg/PTFE/NC Agent
Authors: Wang Lei , Ju Jian , Guan Hua 
Published: April 2020

Abstract
In order to improve the radiation radiation area of Mg-PTFE infrared bait agent and reduce the radiation intensity, the Mg/PTFE/NC particle type agent was prepared by solvent evaporation method to study the infrared radiation performance of the particle agent. The results showed that the radiation area of the granular agent increased by 60% on average and the radiation intensity decreased by 84% compared with the equal-quality powdery agent. For granules, the radiation performance increases with the increase of particle size. When the particle size increases from 690.6μm to 1048.3μm,the average radiation area increases from 139.51cm2 to 172.83cm2,and the average radiation intensity is 2.89 W• Sr−1 increased to 4.56 W•Sr−1; while the mass fraction of Mg-PTFE in the granules also increased with the increase of mass fraction, and the effect on the radiation area was small; mass fraction When increasing from 30% to 70%,the radiation intensity increases from 2.64 W•Sr−1 to 5.62 W•Sr−1.