bluuebunny/crossref_metadata_2025 huggingface dataset:
The coordinated development between the internal audit guidance by the government audit departments and internal audit units: applying the principal component analysis and Monte-Carlo simulation
Authors: Guo Hong Yu , Ding Yi Cen , Chang Qian , Zhu Chang Ping , Zhao Ying , Zhang Qing
Published: December 2019

In the new era, reform of the audit management of Official Audit Organs need systems thinking. This paper focus on the guidance and supervision of internal audit, which is the important content of the audit management system. Through the analysis of the present situation from various perspectives, aiming at the outstanding problems that still need to be paid attention to under the new situation. It explores a feasible way to coordinate the development of internal audit guidance and internal audit institutions, and tries to exemplify the application section on the basis of empirical analysis. To quantify the relevance between internal audit guidance and internal audit institutions through scientific method, introducing Principal Component Analysis and Monte Carlo Method, also provides some reference ideas for practical application.
Emergency Evacuation: Dynamic Network Diversion
Authors: Yang Yulu , Wang Jiawei , Zhao Hongxia , Liu Xiangdong
Published: December 2019

Under the dangerous conditions, rapid evacuation of large public spaces is critical to the safety of visitors. Taking the Louvre as an example, this paper comprehensively considers the characteristics of tourists, the internal structure of Louvre, the dangerous situation and the openness of some secret exits. At the same time, based on the improved Cellular Automaton model and Network Flow model, this paper constructs the Dynamic System Optimal model. By applying the Frank-Wolfe algorithm, this model is simulated in MATLAB to simulate the evacuation of visitors in the emergency situations. Through the simulation results, we can find out the potential bottleneck position that restricts the movement to the exits and make the system’s optimal evacuation program. It can be verified that the evacuation efficiency of the Louvre has increased by 21.3% after using the system’s optimal evacuation plan. In addition, our model also has a broad application prospect. It can be extended to the evacuation of people in other large buildings by changing the parameters of initialization to improve the evacuation efficiency and protect people’s safety.
Forecast estimator of surface machining completion
Authors: Nemenko Alexandra V , Nikitin Michael M
Published: January 2020

We consider the problem of estimating the possible outcomes of surface machining with specified output characteristics. The process of characteristics changing during machining is considered as a random walk with two absorbing levels corresponding to successful and unsuccessful outcomes. For its quantitative description, a Markov process with discrete time and continuous states corresponding to the selected characteristic is used. The transition probabilities for the next step for each of these quantities are given by distribution functions which can be obtained empirically.
Quality assurance for the production of metal-cutting tools from high-speed steels
Authors: Korotkov Alexander , Korotkova Lidiya , Vidin Denis
Published: January 2020

The paper presents an analysis of the state of metal cutting tools production in Russia, and it provides an assessment of the main trends in the development of this industry on the example of tools produced under conditions of domestic engineering enterprises. The developed and tested methods of quality control of high-speed steels of traditional and powder versions are described. Based on the undertaken studies, typical structural defects of high-speed steels in the delivery state and after heat treatment are identified. Recommendations aimed at improving the tool quality were developed and formulated taking into account an analysis of their operating conditions and in accordance with specific conditions of production and quality of steels in the delivery state. A methodological approach to solving the problem of improving the quality of metal-cutting tools made from traditional and powdered high-speed steels is presented.
Problems of the equipment choice for existing multiproduct chemical plants
Authors: Karpushkin S V , Krasnyanskiy M N , Mokrozub V G
Published: January 2020

The problem of using the existing equipment to make a new product in a given volume by the due date is formulated as a two-level hierarchy of tasks. The upper level is the problem of finding product's batch size and scheduling parameters of the plant; the lower level is the problems of selecting the equipment units for the implementation of the batch processing stages. Example of solving the problem of making a new product in a given volume by the deadline for real multiproduct batch plant.
Investigation of fuel consumption by independent heaters depending on bus operating conditions
Authors: Kulko A P , Kulko P A , Chernova G A , Shipovalov D A
Published: January 2020

The article provides a rationale for the adjustment of fuel consumption rates by autonomous heaters in the bus operating conditions in winter. It was determined that the regulatory documents fuel consumption is assigned to the continuous operation of the heater and does not depend on changes in climatic factors and the characteristics of the thermal and structural characteristics of the bus body. The authors monitored the mileage and fuel consumption of buses of the Volzhskiy city motor company No. 1732 in the winter and summer months under operating conditions. A method has been developed that makes it possible to statistically determine fuel consumption and plan these costs in winter. The proposed fuel consumption standards buses during the winter operation. It contains recommendations for adjusting fuel consumption rates.
The approach of the transport & logistics cluster model development
Authors: Makarova E S , Lukashuk M D
Published: January 2020

The Russian transport system is in seriously need of renovation and improvement its competitiveness in the international logistics area. In this article it is proposed one of the potential variant of solving this challenging task – it is a creation of transport&logistics cluster. Transport&logistics cluster is a new organizational form, which purpose will be to increase not only the quality of transport services, but also the maximization of the effectiveness of the activities of all the participants in the association.
Transform-dispersion analysis of the grain-size composition of mechanical admixtures in the cooling lubricant when investigating purification processes
Authors: Bulyzhev Evgeny , Bogdanov Andrey , Khudobin Leonid
Published: January 2020

This article presents the potential solution of the one of the most complicated issues arising by studying the purification processes efficiency of fluids and by producing cleaning agents. The result is that the procedure is substantially simplified, the reliability and the computational accuracy are enhanced when estimating statistical primary

(

d
¯

)

and secondary (σ) couples of the grain-size composition of mechanical admixtures in original and purified cooling lubricants and other fluids and also when determining the efficiency of cleaning agents work.
Formation of film antifriction coatings on the friction surfaces of machine parts
Authors: Gorin A V , Rodichev A Yu , Tokmakov N V
Published: January 2020

The article presents a study of the adhesion strength of film anti-friction coatings. The process of a film anti-friction coating formation is described. An experiment to determine the adhesion strength of a film anti-friction coating is considered. In the course of the experiment, a number of samples of different roughness were used on which an anti-friction coating was applied. The thickness of the coating was controlled by a thickness gauge. Conducted a qualitative assessment of the adhesive strength of the coating with the base metal. Conclusions about the strength of adhesion, its dependence on surface roughness and initial surface treatment are made.
Cutting ability of abrasive grains in the processing of billets of plastic materials
Authors: Unyanin A N , Khazov A V
Published: January 2020

When processing billets of plastic and adhesive-active materials, the loss of the cutting ability of the grinding wheel is mainly due to the adhesion of the workpiece material particles to the abrasive grains (AG). To develop recommendations aimed at reducing the intensity of adhesion, it is necessary to identify the relationship of the intensity of this process with the physical and mechanical properties of abrasive grains. The dependence for the calculation of the voltage at the contact area of the clip with the AG after the AG out of contact with the workpiece is obtained. Numerical simulation of local temperature when microreserve (scratching) samples of steel 3KH3M3F abrasive grains of various materials. According to the obtained dependences, the deformation of the excrescence and the stresses resulting from this deformation were calculated, and the ones acting on the connection of the 3KH3M3F steel excrescence with grains from materials having different coefficients of linear expansion. It is established that with the increase in the difference of the coefficients of linear expansion of the billet materials and AG, the stresses that contribute to the separation of the excrescence from the surface of AG increase, which allows to predict a lower intensity of sticking of the billet material to AG from such materials. It is established that with the increase in the difference of the coefficients of linear expansion of the billet materials and AG, the stresses that contribute to the separation of the excrescence from the surface of AG increase, which allows to predict a lower intensity of sticking of the billet material to AG from such materials. Experimental studies, during which micro-cutting of samples by single abrasive grains was carried out, showed that AG from elbor wear out and are salted to a lesser extent. Elbor has the maximum value of the coefficient of thermal conductivity among the tested materials and to a lesser extent wears out, so the local temperatures when cutting grains from Elbor are minimal. In addition, the difference between the linear expansion coefficients of the material excrescence and elbor has a maximum value. Therefore, at the site of contact AG from elbor with the adhesive there are stresses that contribute to the separation of the excrescence from this surface, which is the reason for the small value of the coefficient of salting AG from elbor. As a result, AG was ranked from various materials according to the criteria characterizing their wear and salting. Confirmed identified analytically the relationship between the intensity of brining of grain with a coefficient of linear expansion and thermal characteristics of the materials AG.
A progressive method of mounting machine parts on the shaft
Authors: Arbuzov M O , Nekrasov A Ya , Sobolev A N
Published: January 2020

In mechanical engineering, various methods of fastening the hub to the shaft for the transmission of torque are widely used. However, the methods used are not devoid of a number of disadvantages inherent in varying degrees for each of them. The authors proposed a constructive solution for reliable mounting of the hub on the shaft, which provides operational control of the axial and angular position of the part, and also developed a software application that allows the calculation of the tightening force depending on the connection parameters.
Comparative analysis of the economic efficiency of using engine units on an industrial tractor of a 10 tons thrust class
Authors: Lomakin G V , Dyakonov A A , Kondakov S V
Published: January 2020

Creating competitive technology requires innovative solutions from the manufacturer. One of such solutions can be the use of power plants on an industrial tractor that simultaneously meet high technical, economic and environmental indicators. In this regard, the article presents a comprehensive analysis of the characteristics of the power plants under consideration, using the example of an industrial tractor with a thrust class of 10 tons.
Integrated risk management of petroleum engineering enterprises
Authors: Deberdieva E M , Frolova S V
Published: January 2020

This article discusses the current problems of the functioning of oil engineering enterprises. The emergence of new risks inherent in oil engineering is shown, which is due to the intensified transformation of the external and internal environment, the complexity of production systems, competition among machine-building enterprises, their various levels of development, which ultimately determine material consumption, energy consumption of gross domestic product, labor productivity, industrial safety and defense of the state. The results of a study on the management of specific integration risks are presented. At the same time, the classification of risks inherent in integration structures was carried out, their assessment was based on the use of expert assessment method, hierarchy analysis method, ALARA risk ranking matrix. A program has also been proposed in order to increase the effectiveness of managing the identified specific risks of integrated oil engineering enterprises by developing measures to minimize such risks.
The structural model of automated leveling system for a construction machine
Authors: Siuhin Alexandr , Zverev Mikhail , Balashov Pavel
Published: January 2020

Realization of road construction works at a high-quality and modern level is associated with significant requirements for accuracy and speed. In the manual mode, it is no longer possible to carry out the leveling process in accordance with these requirements. Therefore, a topical task is to automate the process of leveling the roadway using modern information technologies. Automated control systems for road construction equipment can improve the quality of performed work on terrain profiling and increase the life of the roadway. The article presents a structural model of the automated leveling system for the grader, reflecting the processes of interaction between subsystems and the relationship between them. The obtained results can be used to develop hardware and software systems for the control of road-building equipment.
Virtual enterprises in implementation projects of integrated machine-building CAD systems
Authors: Cherepashkov A A , Samoylov P A
Published: January 2020

The article discusses the problems of introducing CAD systems integrated into complex automated systems. One of the main reasons for failures and low efficiency of projects for implementation of automated systems are personnel problems. To accelerate implementation of the pilot project and adaptation of CAD systems’ users, it was proposed to create specialized educational project virtual enterprises (EP VE). EP VE is formed within the implementation project as a kind of digital twin of a real enterprise on basis of authorized training centers, including those created by companies developers in supporting universities.
Forecasting of the residual resource of automotive alternators
Authors: Puzakov A V
Published: January 2020

The urgency of the problem under study is caused by the imperfection of methods for diagnosing automotive alternators, which do not reveal hidden defects, as a result of which the alternator failure is sudden and entails costs due to vehicle downtime in repair. The aim of the study is a method for predicting the residual resource of automotive alternators, built on the results of diagnosing and assessing the operating conditions of an automobile. Analytical expressions describe the dependence of the intensity of an alternator resource on the ambient temperature and operating time, considering its technical condition at the time of diagnosis and the degree of its change under the influence of factors operating conditions on the test run. The theoretical results were confirmed by experimental measurements. The presented results can be used for the full implementation of the resource of automotive alternators in the conditions of road transport enterprises.
Economic and financial aspects of the organization in metal-processing enterprises in the modern Russian economy
Authors: Klyueva Irina S , Varaksa Anna M
Published: January 2020

The article is justified the significance of the manufacture of machinery and equipment. Consider how the situation has changed in this industry after the transition to a market economy. The key financial ratios are given and the Herfindahl-Hirschman index is calculated. To conduct a study were used such methods as induction, analysis and econometric methods of calculation. The results of the study showed that the situation in the Russian machinery-producing industry deteriorates from year to year, which could lead to the bankruptcy of enterprises and a further lag in Russian industry.
Investigation of impact of cutting oils on formation of surface defects during grinding
Authors: Nosov N V
Published: January 2020

The paper proposes a new approach of evaluating the quality of cutting oils through the study of defects emerging on raceway surfaces of instrument bearings during profile grinding with use of different cutting oils. It has been also established that the wear of rubbing surfaces of bearings exposed to sliding friction generally depends on presence of defects and relates to fatigue fracture of the surface layer caused by repetitive thermomechanical exposures. Moreover, the wear rate depends on sizes and shapes of defects which act as stress raisers and so are of primary importance. Many experiments described in literature confirm that noise and vibrations directly depend on presence of defects on working surfaces of rolling bearings.
Method of quality assessment of design of complex objects in mechanical engineering
Authors: Akhtulov Alexey , Ivanova Lyudmila , Charushina Elena
Published: January 2020

Methods for assessing the quality of the design processes of complex technical products are considered, taking into account the main quality indicators for a reasonable choice of the most acceptable option from among competing ones. Methods for assessing the impact of individual stages of product design are described, and methods are proposed for determining the accuracy included in the selected indicator.
Design of elements of imitator’s construction of physical loads of software and hardware platform of training complex
Authors: Obukhov Artem , Dedov Denis , Nikitin Dmitriy
Published: January 2020

Training complexes are an effective and modern tool for training personnel working in conditions of increased risk to human health and life, which allow minimizing accidents and material damage. One of the actual problems of the use of simulators is the lack of realism of user movement in the virtual world. In order to solve this problem within this study, the task of a simulator design of physical loads is considered. The developed prototype simulator allows a comprehensive and realistic training of personnel in normal and emergency situations. The article describes the basic structure and functionality of the simulator, the geometric dimensions of the rolling belt are determined. The dependencies of determining the size of the drive shaft and the kinematic parameters of the drive are scrutinized. The listed parameters define the actual position of the student, dynamic loads (magnitudes of speeds, accelerations and torques) during the simulation of working and extreme situations. The obtained results will be applied for the physical simulation of the physical loads of the software and hardware platform of the training complex.
Model of processing accuracy prediction with consideration of multi-stage process of circular grinding with axial feed
Authors: Alsigar Masar , Pereverzev Pavel , Almawash Aziz
Published: January 2020

The article describes the solution of the problem of increasing the efficiency of a circular grinding with CNC by applying a model of processing accuracy prediction which considers the multi-stageness of the circular grinding process with axial feed during designing and optimization stages of control cycles for the radial and axial feeds. High productivity of external circular grinding operations with axial feed is ensured by simultaneous control of automatic stepwise cycles of radial and axial feeds in different sections of the shaft.Computed models have been developed; for given grinding cycles of radial and axial feed they allow to determine values of all main error types which are caused by the presence of initial radial run-out of the billet and elastic deformations of the technological system in three shaft sections (in reverse and non-reverse zones): diameter error, circularity deviation, radial run-out, cylindricity deviation, longitudinal section profile deviation, and total radial run-out.
Systematization of rolling-stock parameters in piggyback systems
Authors: Tsyganov A V , Osintsev N A
Published: January 2020

The growth of the external trade between countries makes it necessary to modernize the transport system and realize intermodal technologies that provide effective cargo delivery. Analysis of using piggyback transportation abroad and in Russia is done in this article. Parameters system of rolling-stock in piggyback transportation is proposed. Using the proposed system will enable the compatibility assessment of vehicles that are used in shipment organization. And it will help to choose the most appropriate option of shipment using piggyback transportation.
The stressed state of a titanile shell operating in a medium with hydrogen
Authors: Emelyanov I G , Mironov V I , Ogorelkov D A , Hodak A S
Published: January 2020

Improving reliability in the operation of equipment operating in a water-containing environment is associated with solving the problem of hydrogen embrittlement of metals. In the absence of a rigorous physical theory, it becomes necessary to predict the carrying capacity of various structures based on the available experimental data showing a decrease in the mechanical properties of materials in contact with hydrogen. In this paper, a solution is given to a physically nonlinear problem of determining stresses in a titanium shell. When integrating resolving equations, the method of SK Godunov’s discrete orthogonalization is applied. Due to the fact that hydrogen most noticeably reduces the plastic properties of metals, the construction has revealed a dangerous point with a maximum intensity value of tangential stresses. The regularities of changes in the intensity of shear deformations at the dangerous point of the shell during an emergency pressure increase in the apparatus have been found. It is shown that an emergency pressure increase in the shell may lead to the appearance of plastic deformation zones, and the effect of hydrogen is manifested in the reduction of the breaking load.
Research of surface hardness after electrical resistance deposition with a wire
Authors: Ponomarev A I , Plakhov S A
Published: January 2020

The article presents results of experimental research of parameter’s impact on mode of electrical resistance deposition with a wire of 65Mn steel on hardness properties of surface layer. Also the research contains structures of heat tempering zones of metallographic exploration of surface layer after electrical resistance deposition with a wire of 65Mn steel. Finally, there are provided recommendations how to reduce square of local softening after electrical resistance deposition with a wire.
Determination of oil-water emulsions separation efficiency in the separator with a vortex flow
Authors: Madyshev I N , Dmitriev A V , Vin Dang Suan
Published: January 2020

This paper deals with the study of oil-water emulsions separation processes in the separators with a vortex flow. The authors developed a new design of separator, consisting of Π-shaped elements and, when the liquid moves between these elements, the centrifugal force appears, leading to the layering of oil-water emulsion. The paper includes the numerical studies on the flow structure determination, conducted by means of software package ANSYS Fluent, and allowing us to evaluate the design of separators to achieve the high separation efficiency. It was found that an increase in the actual flow rate, and, as a consequence, the Reynolds number, as well as the height of device lead to an increase in the emulsion separation efficiency. At the same time, the oil concentration at the device outlet can reach 99.9%. The developed device allows to increase significantly the throughput capacity of apparatuses for the oil-water emulsions separation, widely used in the oil-and-gas extraction industry.
General principles and search strategy for rational structure types reconfigurable production systems
Authors: Kapitanov A V , Mitrofanov V G
Published: January 2020

The article considers selection of rational production system (PS) type. The selection method is described that is based on establishing the structural attributes of an inflow of orders, creation of production system typical structures bank, defining the shared boundaries between typical structures in metric space and development of metrics calculation approaches. The article shows that selection of rational PS type implies the selection of PS technological structure and defining its optimum automation level.
Geometrical identification of invisible defects in structural elements basing on digital image correlation data
Authors: Apalkov Andrew A , Odintsev Igor N , Usov Stanislav M
Published: January 2020

The paper addresses an experimental-calculational technique intended to determine geometrical parameters of invisible crack-like defects in thin-wall structural elements. Object deformation response to low trial loading is used as baseline data for assessment. The response is recorded using the digital image correlation method. Further analysis consists in minimization of differences between experimental findings and serial model calculations. The description of the approach is carried out on the example of a test specimen in the form of cylindrical shell (tube section) with a non-through crack simulator on the inner surface. The expected displacement fields for different particular cases are calculated using the finite element method.
Evaluation of machinery-building enterprises activity in the concept of sustainable development
Authors: Kuznetsova E Yu , Kuznetsov S V , Podoliak O O
Published: January 2020

The global idea of sustainable development as a Trinity of economic, social and environmental development priorities confirms its relevance at the level of the country, region and enterprise. An industrial enterprise can and should be responsible for environmental performance in terms of ensuring the safety of its production technologies and for implementing social objectives for its employees as a socially responsible employer. In order to monitor the implementation of the concept of sustainable development, it is necessary to develop a system of target indicators by which to assess the degree of achievement of the goals not only at the state level, but also at the level of the enterprise - the key link of the economic system. To implement the monitoring of sustainable development, an attempt is made to ensure the "cross-cutting" nature of sustainable development indicators – the presence of similar indicators at all levels of economic development – from the enterprise to the level of the region and the state. Approbation of the author's technique is made on the example of industrial enterprises of machine-building profile.
Dispersion and attenuation of bending waves propagating in a beam in the material there of damages accumulate during the operation
Authors: Brikkel D M , Erofeev V I , Leonteva A V
Published: January 2020

An approach is proposed that determines the new dependences of parameters of a linear bending wave on the degree of material damage.
Microstructure effect of weld joint heat affected zone on the temperature velocity factor of ultrasound
Authors: Gonchar A V , Kurashkin K V , Klyushnikov V A
Published: January 2020

The effect of temperature on the longitudinal wave speed in the heat-affected zone of the weld joint of structural steel 20 is investigated. The heat-affected zone is the most dangerous place where the stress-strain state is realized and a gradient of physical and mechanical properties is observed. As a rule, it is in the heat-affected zone that the structures are destroyed. The structural state of the heat-affected zone has a significant effect on the temperature dependence of the elastic wave velocity. As a result of the research, numerical values of the temperature-velocity factor for longitudinal ultrasonic waves in steel 20 for the heat-affected zone and the base metal were obtained. In the future, the dependencies can be used to develop methods for determining material damage by the ultrasonic method.
Determination of the particle deposition efficiency value in a granular and open cell foam filter
Authors: Soloveva O V , Solovev S A , Yafizov R R
Published: January 2020

We constructed a model of a granular filter with spherical granules with a diameter of dc
= 5 mm and a porosity of ε = 0.44, as well as two models of a highly porous cellular filter. The first model has a porosity equal to the porosity of the granular filter, and the second model has a surface area equal to the surface area of the granular filter. A numerical and experimental study of the change in pressure drop depending on the average filtration rate was carried out; the results are in a good agreement. In the case of porosity of the granular filter. In the velocity field found, the trajectories of the particles are calculated, by which the efficiency of particle deposition is determined as the ratio of the number of particles deposited in the filter to the total number started. The deposition efficiency curves are the closest for models with a same filter surface area. The surface area of the material is the determining parameter when choosing a filter.
The use of computer vision for automated control of gypsum feed and conveyor belt movement in the production of a gypsum plasterboard
Authors: Kotyuzanskiy L A , Chetverkin N V , Ryzhkova N G
Published: January 2020

The paper presents a description of the gypsum dough spill analysis method on the basis of computer vision for automated control of gypsum feed and conveyor belt speed. The task of computer vision is to control the form of gypsum dough spill on the basis of optical analysis of video data in real time.
Model of fragile destruction of metal constructions at reduced temperatures
Authors: Kabaldin Y G , Khlybov A A , Anosov M S
Published: January 2020

The paper presents the results of studies of metals with different types of crystalline structure in a wide range of low temperatures. Based on the data obtained, a model of brittle fracture of metals at low temperatures is proposed. The relationship between the lattice parameter of metals and the temperature of a viscous-brittle transition is established. A quantum-mechanical simulation of the effect of temperature on the lattice parameter has been carried out. It is shown that a decrease in the lattice parameter is observed with decreasing temperature.
Evaluation of the mechanism of the destruction of metals based on approaches of artificial intelligence and fractal analysis
Authors: Kabaldin Yuri , Anosov Maksim , Shatagin Dmitrii
Published: January 2020

The article examines modern informational approaches to assess the degree of damageability of materials based on their fractographic images. The possibility of using the fractal dimension, wavelet transform and convolutional artificial neural networks for tiling and classifying the share of viscous and brittle destructions on fractures is shown. The results of experimental studies of the impact viscosity of materials with different types of crystal lattices in a wide range of temperatures are presented.
Experimental evaluation of traction and coupling properties of terrain vehicles
Authors: Klubnichkin E E , Klubnichkin V E , Ryakhovsky O A
Published: January 2020

The article demonstrates the results of the experimental evaluation of the traction and coupling properties of the wheeled utility terrain vehicles (UTV) during which parameters and indicators allowing for their use during designing of new generation UTVs are determined. This work demonstrates the results of the tests in determining maximum drawbar pull; determining maximum drawbar pull at snatch load of the Russian-made UTVs RM 650-2, Stels 800 Guepard and foreign-made UTVs Yamaha Grizzly, BRP Outlander Max XT, BRP Outlander 6x6, Polaris Sportsman 1000 equipped with wheels with grouser height of 15 to 40 mm.
Modeling and computation of stretch-forming technological process rational parameters
Authors: Bormotin K S , Aung Win
Published: January 2020

Mathematical models and numerical methods for solving optimal control problems in the shaping of monolithic panels by stretching on the punch have been developed. As criteria, residual displacements and damage in plasticity are considered. The algorithms implemented in MSC.Marc allow us to calculate the optimal parameters of the stretch forming press work.
Control of the properties of metal alloys obtained by aluminothermy
Authors: Komarov O N , Zhilin S G , Predein V V , Popov A V
Published: January 2020

The paperwork considers the possibility to control the properties of the obtained experimental alloys, and also to ensure the reduction of the interaction between the resulting reaction products and materials of refractory equipment by adding filler materials to iron-aluminum thermite. There have been revealed regularities of the metal yield and the content of impurity chemical elements in the alloy composition depending on the quantity of input fillers. The analysis of the structure has been done, and hardness of the test items has been determined. The obtained experimental alloys with addition of various quantity of filler materials, according to the current standards, in chemical composition correspond to the steel grades which have been determined.
Constructive ensuring the accuracy of processing of the spherical ends of the bearing rollers
Authors: Mikhailova L N
Published: January 2020

The article focuses on ensuring the accuracy of the ends of the rollers of tapered bearings when machining on sphere grinding machines. Reviewed of the design the spherical grinding machine tools, with the periphery of the wheel profiled by a given radius have been given. The use of a corrected radius for profiling a circle is proposed, for which the design of the device for the basing and moving the rollers has been developed. Experimental studies of the use of the device are held. The results showed that the proposed constructive solution ensures the accuracy of processing the sphere of the end face of the tapered bearing roller.
Dynamic research of elementary differential gear with elastic links
Authors: Slobodyanik T M , Balakhnina E E
Published: January 2020

Many research works are devoted for study of static and dynamic parameters of planetary gears of various designs. A number of dynamic problems can be solve accurately enough without taking into account the elasticity of loaded elements. In calculations of mining machines transmissions dynamic processes must be considered gear flexibility as is much more than flexibility of large diameter and small length shafts. In this article are considered possibilities and features of research of dynamic phenomena that take a place in planetary mechanisms of mining machine transmissions. For this purpose planetary mechanisms are presented as elastic mechanical systems. For research the dynamic model of elementary differential mechanism with taking into account the link elasticity is used. For this purpose the differential gear presented as equivalent planetary row with inertialess planetary carrier. Main links of such mechanism have inertia moments determined by known formulas. The equivalent dynamic model of elementary differential gear is presented as three-mass branched system. Moments of elasticity, occurring in mechanical constraints of system, are determined. Equations of movement for each of the masses give the linear homogeneous differential equation system or free oscillations equation system of mechanism. This system is representable as linear algebraic equation system. Particular solutions of inhomogeneous differential equation system are of practical interest, as they permit to make the analysis of the effect of external loads, acting on the mechanism. Operator solution method application will give particular solutions of linear inhomogeneous differential equations. Received systems will allow solving many dynamic tasks of elastic mechanical systems: character change and maximum values of mechanism links dynamic loads, periods and frequencies of oscillations, conditions of the resonant state of the mechanical system.
Planning methods of modernization of industrial enterprises using graph models
Authors: Lukina S V , Korshunova E D , Dobrolyubova Marina
Published: January 2020

This paper presents the methods of compiling programs aimed at modernizing industrial enterprises of various purposes. These methods help to form the entire sum of all permissible alternative options of modernization programs at initial stages for their subsequent evaluation and comparison. The basis of the method is a ten-graph model that defines a number of options for implementing individual structural components of the modernization program, such as the range of products manufactured, the technological process of manufacturing primary components, the main equipment, the cutting tools and accessories, organization of the manufacturing process, enterprise staff, suppliers of materials and components, financing plans for the modernization program, and the parameters of external macro environment of the enterprise in question. A mathematical model used to form a multitude of alternative options of modernization programs, employing algorithms of searching into the graph depth and width, has been developed. The developed method may be employed to form options for the modernization of industrial enterprises of various purposes. Industrial testing of the developed method has demonstrated its efficiency and flexibility in solving various problems linked to modernization of industrial enterprises.
Collision detection and avoidance method for two cooperative robot manipulators
Authors: Kabanov A A , Tokarev D A
Published: January 2020

The paper examines a collisions detection and avoidance problem for two cooperative robot manipulators. The proposed collision detection method is based on the division of workspace into small discrete volume spaces. Each of the discrete volumes have the status “occupied” or “free”. The control system generates restriction signals when the motion along the calculated path will bring the manipulator into occupied volume spaces. A step-by-step algorithm of the collision detection system is given.
Numerical study of non-linear deformation processes of reinforced concrete structures elements interacting with soils
Authors: Balafendieva I S , Notfullina A A , Galimullin I A
Published: January 2020

In the framework of an approach based on the mechanics of a transforming structure, a method is proposed for calculating the deformation processes of elastoplastic reinforced structures interacting with soils of complex physical nature. The technique is based on the use of the defining relations, connecting the increments of the true stresses and strains. As an illustration of the performance of the proposed methodology, some results of the calculation of the stress-strain state of the walls of a metro tunnel station at different stages of its construction are given.
Working equipment of the single-bucket excavator for the development of frozen ground
Authors: Letopolsky A B , Korchagin P A , Teterina I A
Published: January 2020

The article presents a variant of improving the design of the working equipment of a single-bucket excavator. The proposed technical solution allows the development and sampling of solid and frozen soil without changing the working equipment from the bucket to the hydraulic hammer. The result is achieved by installing two hydraulic hammers on the front part of the bucket. Presents calculations of the hydraulic system of the excavator and hydraulic hammers, allowing to confirm the performance of the proposed solution. The methodology of technological operations is determined taking into account the use of the proposed technical solution.
High-torque axial-plunger hydraulic motor with phase control of the shaft rotation speed
Authors: Nizhegorodov A I , Gavrilin A N , Moyzes B B
Published: January 2020

The article reviews the design and parameters of high-torque axial-plunger hydraulic motor with phase control of the shaft rotation speed. This hydraulic motor is distinguished by a two-row eighteen-cylinder block and a rotary distribution disk with two rows of sickle-shaped distribution windows for supplying and discharging the working fluid. The hydraulic motor differs by a tripled displacement and torque from a similar hydraulic machine, which classifies it a high-torque hydraulic engines. Its power volume increases 1.6 times, and power response more than four times. At the same time, the fluctuation of the shaft rotation speed is measured by the corresponding value of the fluctuation coefficient equal to 0.0154. The phase control provides the hydromotor with a control range of 150…200 and more, while hydraulic motors with variable working volume range maximum 5. Therefore, the new hydraulic machine has a high potential for operating in hydraulic drives of machines.
Integral estimation of the activity of the maintenance department of the mining company
Authors: Andreeva L I , Krasnikova T I
Published: January 2020

This paper demonstrates the results of study in relation to increasing the efficiency of the maintenance department of the mining company. We consider the systematic and complex approach to estimating the activities of the maintenance department, which is based on analyzing the efficiency of the arrangement for repairing and maintaining the mining machinery, evaluating the practicability of its operation according to the ratio ‘result/expenses’, studying the structure of the maintenance personnel and also evaluating the influence of operating modes and conditions on the productivity of machinery. This approach allows to find out the hidden reserves in the organizational, technical, technological and economic systems of the company. In addition, we demonstrate the results of evaluating the system ‘excavator-cut face’, which characterize the condition of an excavator and conditions (cut face, working area) of its operation, perform the analysis of the downtime of the equipment during the maintenance and when it breaks down. We consider the systematic approach to estimating the economic practicability of operating and repairing the mining machinery, which allows to make managerial decisions in relation to every unit of machinery. Also the recommendations for increasing the efficiency of the maintenance department of the company are given.
Ultrasonic tomography of pressure couplings
Authors: Ivannikov V P , Kabakova A V , Chaykina A Yu
Published: January 2020

The article tells of the method of pressure coupling fit area research with ultrasonic tomography, which was set up on the basis of the proprietary technology of quantitative estimation of press-fit joints quality with the ultrasonic echo-impulse method. The possibility of 3D - images receiving of the press-fit joint strain-stress state area is shown. On the basis of the study of the characteristics of ultrasound reflection from the pressure coupling fit area, it is shown that the ultrasonic signal reflection coefficient is the general characteristics of press-fit joint quality because it is bound with the normal stresses appearing on the joint surfaces. Considerable attention is paid by the authors to the possibility of optimization of the research process: the possibility of automation of joint quality control by the described method is realized.
Dualism for CAD-system creation based on natural- intellectual representation
Authors: Razumowsky A I , Loktev M A
Published: January 2020

When developing difficultly deterministic software solutions of automated systems, control over the algorithmization and structurization of the task should lie outside the control of the formal interconnection of operators and data. The design of software systems should be controlled from the external control area both over the algorithmization and structuring, and over the autonomous independent consideration of the element. The fact of the possibility of arbitrary coordination of the structural elements of the software system is called the dual representation. The integrative role between independent design elements is assigned to the natural – intellectual interface, which is able to provide a dualism of perception of the elements of the information space both as structurally related and as independent.
Improving the performance of the processing of deep holes by improving the structure of the boring tool
Authors: Khramov A , Semdyankin I , Kiselev E
Published: January 2020

The experimental and industrial testing of the developed design of a new boring mandrel for processing deep stepped bores in the body workpieces of gray cast iron has been performed. The boring mandrel is characterized by high rigidity and fast replacement of cutting plates. The use of the mandrel in the current production of the GAZ Group of enterprises allows three to four time increase in the productivity of boring holes in the large-scale production of cylinders.
Influence of capillary autohesion on structure and molding properties of ceramic granular molding compounds
Authors: Belov V V
Published: January 2020

The prerequisites of optimal designing of compositions of raw mixtures for the production of molded ceramic products, based on the laws of the formation of polydispersed structures, is presented in the paper. The choice of methods for calculating the optimal humidity of raw mixtures, providing the optimal parameters of their compacting is suggested. The influence of the humidity of the raw mixture on the packaging of its particles and bulk density, as well as the plastic strength of the molding, taking into account the action of capillary adhesion, is shown in the article.
Future developments of a roll forming mill design algorithm
Authors: Osadchiy V A , Albul S V , Kuprienko N S , Kirillova N L
Published: January 2020

The paper discusses the prospects of creating an algorithm for designing a roll forming mill. The algorithm scheme implies a parametric input of the initial data of technology requirements, a calculation of structural elements taking into account requirements of the customer and the output of the algorithm result in the form of design documentation for the rolling facility.