Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-39-50
A. Puzanov, Sergey Kurdubanov
The study objective is to improve the operational characteristics of hydraulic drives. The task to which the paper is devoted is to simulate operating processes and minimize the vibrations of the drive hydraulic and mechanical components based on the analysis of the main types of generators and dissipators of acoustic vibrations in hydraulic systems. Research methods: analysis of complex multidisciplinary models of hydraulic machine operating processes. Macro-models provide solutions to problems at the system level. Micro-models provide an analysis of the operating processes of hydraulic drives, taking into account the influence of internal and external factors of impact operating, the interaction of components and parts, changes in structural and technological parameters. The novelty of the work is in the substantiation of the influence of operational factors, structural and technological parameters on the vibration processes that form the acoustic characteristics of the hydraulic drive. The results of the study are presented on the example of reducing the vibration processes of an axial plunger hydraulic machine. Fluctuations in the operating pressure are given in the indicator diagram. The vibration amplitude depends on the dead volume of the piston chamber, as well as due to its under-filling operation at low temperatures. Also, based on the simulation results, zones of energy dissipation of the working fluid are localized to reduce vibration processes. Conclusions: the obtained results of modeling various measures to reduce the vibration processes will allow to localize and reduce the negative factors of noise generation.
{"title":"IMPROVEMENT OF ACOUSTIC PARAMETERS OF HYDRAULIC DRIVES","authors":"A. Puzanov, Sergey Kurdubanov","doi":"10.30987/2782-5957-2023-5-39-50","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-39-50","url":null,"abstract":"The study objective is to improve the operational characteristics of hydraulic drives. The task to which the paper is devoted is to simulate operating processes and minimize the vibrations of the drive hydraulic and mechanical components based on the analysis of the main types of generators and dissipators of acoustic vibrations in hydraulic systems. \u0000Research methods: analysis of complex multidisciplinary models of hydraulic machine operating processes. Macro-models provide solutions to problems at the system level. Micro-models provide an analysis of the operating processes of hydraulic drives, taking into account the influence of internal and external factors of impact operating, the interaction of components and parts, changes in structural and technological parameters. \u0000The novelty of the work is in the substantiation of the influence of operational factors, structural and technological parameters on the vibration processes that form the acoustic characteristics of the hydraulic drive. \u0000The results of the study are presented on the example of reducing the vibration processes of an axial plunger hydraulic machine. Fluctuations in the operating pressure are given in the indicator diagram. The vibration amplitude depends on the dead volume of the piston chamber, as well as due to its under-filling operation at low temperatures. Also, based on the simulation results, zones of energy dissipation of the working fluid are localized to reduce vibration processes. Conclusions: the obtained results of modeling various measures to reduce the vibration processes will allow to localize and reduce the negative factors of noise generation.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114312264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-14-25
A. Reutov
The study objective is to analyze the influence of elastic-damping characteristics of the two-mass flywheel of the internal combustion engine on the torsional vibrations of the car transmission components. The task is to define the characteristics of forced stationary torsional vibrations of transmission parts under the action of torque fluctuations of the internal combustion engine. Methods: mathematical and computer modeling of forced torsional vibrations of transmission parts. The novelty of the work is in developing mathematical and computer models of the torsional vibrations of a car transmission with a two-mass flywheel and a double dry clutch, defining the conditions for preventing the resonance of the flywheel torsional vibrations at idling speed. Results: mathematical and computer models are developed for the analysis of torsional vibrations of a car transmission with a two-mass flywheel and a double dry clutch. The analysis of forced stationary torsional vibrations of transmission parts in time is carried out. The conditions for preventing the resonance of the flywheel torsional vibrations at idling speed are defined. It is shown that the use of a two-mass flywheel significantly reduces standard deviation of angular velocities and accelerations of parts (except the crankshaft) in comparison with a single-mass flywheel.
{"title":"ANALYSIS OF TORSIONAL VIBRATIONS OF TRANSMISSION PARTS IN A CAR WITH A TWO-MASS FLYWHEEL OF INTERNAL COMBUSTION ENGINE","authors":"A. Reutov","doi":"10.30987/2782-5957-2023-5-14-25","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-14-25","url":null,"abstract":"The study objective is to analyze the influence of elastic-damping characteristics of the two-mass flywheel of the internal combustion engine on the torsional vibrations of the car transmission components. \u0000The task is to define the characteristics of forced stationary torsional vibrations of transmission parts under the action of torque fluctuations of the internal combustion engine. \u0000Methods: mathematical and computer modeling of forced torsional vibrations of transmission parts. \u0000The novelty of the work is in developing mathematical and computer models of the torsional vibrations of a car transmission with a two-mass flywheel and a double dry clutch, defining the conditions for preventing the resonance of the flywheel torsional vibrations at idling speed. \u0000Results: mathematical and computer models are developed for the analysis of torsional vibrations of a car transmission with a two-mass flywheel and a double dry clutch. The analysis of forced stationary torsional vibrations of transmission parts in time is carried out. The conditions for preventing the resonance of the flywheel torsional vibrations at idling speed are defined. It is shown that the use of a two-mass flywheel significantly reduces standard deviation of angular velocities and accelerations of parts (except the crankshaft) in comparison with a single-mass flywheel.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114589063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-51-59
Tatiana Popova, A. Popov
A study of various types of malfunctions in railway transport is conducted. Their critical impact on the safety of operation is evaluated. The research is aimed at studying statistical data on appearing failures and malfunctions both on rolling stock and on railway tracks. At high loads on mechanical components, the probability of various defects is high, which requires the most thorough study of the reliability of structural elements. Any deviation can lead to significant breakdowns and cause huge damage, especially for rolling stock for passenger transportation or transportation of dangerous goods. It is also necessary to predict the indicators of reliability and stability of the system to various impacts. In this regard, the study is aimed at evaluating the failures of railway systems and their critical impact on traffic safety. Despite such a great interest in the problems of evaluating and ensuring the safety of railway transport, there is still no unambiguous evaluation of the parameters of railway carriages and the track for the maximum stability coefficient, if exceeded, the train is highly likely to derail.
{"title":"SAFE CAR OPERATION IN THE PRESENCE OF MALFUNCTIONS","authors":"Tatiana Popova, A. Popov","doi":"10.30987/2782-5957-2023-5-51-59","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-51-59","url":null,"abstract":"A study of various types of malfunctions in railway transport is conducted. Their critical impact on the safety of operation is evaluated. The research is aimed at studying statistical data on appearing failures and malfunctions both on rolling stock and on railway tracks. At high loads on mechanical components, the probability of various defects is high, which requires the most thorough study of the reliability of structural elements. Any deviation can lead to significant breakdowns and cause huge damage, especially for rolling stock for passenger transportation or transportation of dangerous goods. It is also necessary to predict the indicators of reliability and stability of the system to various impacts. In this regard, the study is aimed at evaluating the failures of railway systems and their critical impact on traffic safety. Despite such a great interest in the problems of evaluating and ensuring the safety of railway transport, there is still no unambiguous evaluation of the parameters of railway carriages and the track for the maximum stability coefficient, if exceeded, the train is highly likely to derail.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134259212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-79-91
Aleksey Tsarikov
The study objective is to reduce the level of accidents on the road network of cities and towns of Sverdlovsk region. The task is to study the temporal and spatial unevenness of road accidents; to find out the main causes and patterns of occurring places of accident concentrations; to propose measures to reduce the number of accidents. Research methods are mathematical and statistical methods of analysis, a full-scale experiment. The novelty of the work is the use of spatial and temporal disparity methods to study patterns of road accidents in cities and towns. The study results are that the main causes of road accidents in cities and towns are defined, the completeness of their distribution in time and location in space are determined. A list of measures to eliminate them is proposed.
{"title":"PROBLEMS OF TRAFFIC ARRANGEMENT AND SAFETY IN CITIES AND TOWNS BY EXAMPLE OF SVERDLOVSK REGION","authors":"Aleksey Tsarikov","doi":"10.30987/2782-5957-2023-5-79-91","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-79-91","url":null,"abstract":"The study objective is to reduce the level of accidents on the road network of cities and towns of Sverdlovsk region. \u0000The task is to study the temporal and spatial unevenness of road accidents; to find out the main causes and patterns of occurring places of accident concentrations; to propose measures to reduce the number of accidents. \u0000Research methods are mathematical and statistical methods of analysis, a full-scale experiment. The novelty of the work is the use of spatial and temporal disparity methods to study patterns of road accidents in cities and towns. The study results are that the main causes of road accidents in cities and towns are defined, the completeness of their distribution in time and location in space are determined. A list of measures to eliminate them is proposed.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132628012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-26-38
M. Tamarkin, E. Tischenko, Omar S.A. Hashash, R. Tishchenko
The research objective is to study the technological capabilities and develop methods for designing highly efficient technological processes of strengthening treatment of parts with an oscillating tool - an eccentric strengthener. The tasks are theoretical modeling of the the oscillating tool processing dynamics, theoretical modeling and experimental studies of forming surface roughness, the depth of the strengthened layer and the degree of parts deformation during treatment with an oscillating tool, as well as the development of a technique for designing high-efficiency technological processes. A new method of machining parts by surface plastic deformation is proposed. The dependences of the influence of treatment modes, design characteristics of the equipment and physical and mechanical properties of treated part materials on the quality parameters of the surface layer (surface roughness, depth of the strengthened layer and the degree of deformation) are obtained. The dependence for determining the treatment time is presented. The theoretical dependences obtained are experimentally verified and found to be adequate according to the results of experimental studies. The regularities of designing technological processes ensuring an increase in the operational properties of the machined parts are developed. An engineering calculation technique of optimal parameters of technological processes for machining parts with an oscillating tool is developed in order to increase their operational properties. A method for optimizing the technological processes of machining parts with an oscillating tool is proposed. A software product is developed that allows performing technological design using microprocessor technology.
{"title":"OPTIMIZATION OF STRENGTHENING TREATMENT OF PARTS WITH AN OSCILLATING TOOL","authors":"M. Tamarkin, E. Tischenko, Omar S.A. Hashash, R. Tishchenko","doi":"10.30987/2782-5957-2023-5-26-38","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-26-38","url":null,"abstract":"The research objective is to study the technological capabilities and develop methods for designing highly efficient technological processes of strengthening treatment of parts with an oscillating tool - an eccentric strengthener. \u0000The tasks are theoretical modeling of the the oscillating tool processing dynamics, theoretical modeling and experimental studies of forming surface roughness, the depth of the strengthened layer and the degree of parts deformation during treatment with an oscillating tool, as well as the development of a technique for designing high-efficiency technological processes. \u0000A new method of machining parts by surface plastic deformation is proposed. The dependences of the influence of treatment modes, design characteristics of the equipment and physical and mechanical properties of treated part materials on the quality parameters of the surface layer (surface roughness, depth of the strengthened layer and the degree of deformation) are obtained. The dependence for determining the treatment time is presented. \u0000The theoretical dependences obtained are experimentally verified and found to be adequate according to the results of experimental studies. The regularities of designing technological processes ensuring an increase in the operational properties of the machined parts are developed. An engineering calculation technique of optimal parameters of technological processes for machining parts with an oscillating tool is developed in order to increase their operational properties. A method for optimizing the technological processes of machining parts with an oscillating tool is proposed. A software product is developed that allows performing technological design using microprocessor technology.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123274998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-60-68
D. Antipin, E. Lukashova, A. Boldyrev, F. Lozbinev
Domestic and international experience in increasing the bearing structure rigidity of vehicle bodies in the form of a reinforced shell with a cut-out is analyzed. Based on the analysis, approaches related to the reinforcement of the car underframe with additional longitudinal elements and bearing partitions are considered as promising. Options for installing one as well as with two partitions connected by longitudinal elements are considered. The first frequency of the body bending vibrations, the maximum stresses acting in the reinforced part of the structure, as well as the amount of mass gain associated with reinforcements are accepted as the criteria for choosing a rational design to increase the rigidity of the body bearing structure. The study object is the bearing structure of the sleeping passenger car body, 61-4517 model, produced by Tver Car Building Plant. Having analyzed the bearing structure of the car body, four variants of reinforcing the bearing system are proposed. For each of them, from four to ten structural designs are considered, differing in the type of profiles for their formation. The efficiency analysis within the accepted criteria is carried out by computer simulations using modern industrial software systems based on the finite element method. A detailed spatial and plate body model based on finite element is developed. Heavy equipment is included as some finite elements, as well as interior designs of the passenger car. The results obtained using the developed model are verified by the data of bench full-scale tests of the passenger car body. For each variant and design, the values of the first natural frequency of the body bending vibrations, maximum stresses arising in the structure under the action of regulatory forces, as well as the value of the mass gain of the bearing structure are obtained. The analysis of the obtained variants made it possible to find out the rational variant and its design, which provides an increase in the rigidity of the body bearing structure, a reduction in operating stresses with a minimal increase in the mass of the metal structure.
{"title":"JUSTIFICATION OF DESIGNS TO INCREASE THE BEARING","authors":"D. Antipin, E. Lukashova, A. Boldyrev, F. Lozbinev","doi":"10.30987/2782-5957-2023-5-60-68","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-60-68","url":null,"abstract":"Domestic and international experience in increasing the bearing structure rigidity of vehicle bodies in the form of a reinforced shell with a cut-out is analyzed. Based on the analysis, approaches related to the reinforcement of the car underframe with additional longitudinal elements and bearing partitions are considered as promising. Options for installing one as well as with two partitions connected by longitudinal elements are considered. \u0000The first frequency of the body bending vibrations, the maximum stresses acting in the reinforced part of the structure, as well as the amount of mass gain associated with reinforcements are accepted as the criteria for choosing a rational design to increase the rigidity of the body bearing structure. \u0000The study object is the bearing structure of the sleeping passenger car body, 61-4517 model, produced by Tver Car Building Plant. \u0000Having analyzed the bearing structure of the car body, four variants of reinforcing the bearing system are proposed. For each of them, from four to ten structural designs are considered, differing in the type of profiles for their formation. The efficiency analysis within the accepted criteria is carried out by computer simulations using modern industrial software systems based on the finite element method. A detailed spatial and plate body model based on finite element is developed. Heavy equipment is included as some finite elements, as well as interior designs of the passenger car. The results obtained using the developed model are verified by the data of bench full-scale tests of the passenger car body. \u0000For each variant and design, the values of the first natural frequency of the body bending vibrations, maximum stresses arising in the structure under the action of regulatory forces, as well as the value of the mass gain of the bearing structure are obtained. \u0000The analysis of the obtained variants made it possible to find out the rational variant and its design, which provides an increase in the rigidity of the body bearing structure, a reduction in operating stresses with a minimal increase in the mass of the metal structure.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132043823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-69-78
P. Grigor’ev, S. Korzhin, Sh. R Ibodulloev, V. Goncharov
The problems related to the vibration effects of bulky elements on the cylindrical shell of tank car boilers are considered. To do this, an approach based on the shell theory is proposed. Donnell equations are used to define the loading during vibrations. Equations based on the theories of depressed cylindrical shells and on the polytechnic theory of shells are used. In order to confirm the reliability of the results obtained according to the proposed approach comparative analysis is performed. The rigidity of the attached cylindrical shell is estimated, for which experimental values of deformation under the local load are obtained. The results of calculations for the local single load of a closed cylindrical shell by means of finite element method (FEM) are given. These results show a satisfactory conformity with the data obtained experimentally (based on calculations). Using the proposed technique, the authors evaluated rigidity of the boiler cylindrical part where bulky elements are installed and this makes it possible to define the values of natural frequencies and the level of dynamic addition for various design parameters. Geometrics for tetra axial and eight axial tank cars are used as examples. Additionally, gain-frequency characteristics of deformations, accelerations and dynamic coefficients in the places of bulky elements are presented. Study results can be used to improve the design and the conditions for using tank car boilers.
{"title":"EVALUATION OF VIBRATION EFFECTS OF BULKY ELEMENTS ON THE CYLINDRICAL PART OF TANK CAR BOILERS BASED ON SHELL THEORY","authors":"P. Grigor’ev, S. Korzhin, Sh. R Ibodulloev, V. Goncharov","doi":"10.30987/2782-5957-2023-5-69-78","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-69-78","url":null,"abstract":"The problems related to the vibration effects of bulky elements on the cylindrical shell of tank car boilers are considered. To do this, an approach based on the shell theory is proposed. Donnell equations are used to define the loading during vibrations. \u0000Equations based on the theories of depressed cylindrical shells and on the polytechnic theory of shells are used. In order to confirm the reliability of the results obtained according to the proposed approach comparative analysis is performed. The rigidity of the attached cylindrical shell is estimated, for which experimental values of deformation under the local load are obtained. \u0000The results of calculations for the local single load of a closed cylindrical shell by means of finite element method (FEM) are given. These results show a satisfactory conformity with the data obtained experimentally (based on calculations). Using the proposed technique, the authors evaluated rigidity of the boiler cylindrical part where bulky elements are installed and this makes it possible to define the values of natural frequencies and the level of dynamic addition for various design parameters. Geometrics for tetra axial and eight axial tank cars are used as examples. Additionally, gain-frequency characteristics of deformations, accelerations and dynamic coefficients in the places of bulky elements are presented. Study results can be used to improve the design and the conditions for using tank car boilers.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132353115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-11DOI: 10.30987/2782-5957-2023-5-4-13
V. Istotsky
The paper deals with a method for grapho-analytical modeling of micro-roughness (surface roughness) formed on the helical front surface of a cutting tool during its manufacture or resharpening using CNC grinding machines and grinding wheels with a simple shape of the generative surface. A simulation model of roughness on the formed front surface is presented, and a calculation scheme for determining its value is made. Based on the statistical results of the formed technological 3D models of helical front surfaces, the resulting equations of complete factorial experiments are presented, taking into account the combined influence of factors. Graphs of the normal distribution of the roughness parameter and the parameter of the grinding wheel installation affecting it are given. It is shown that an important result of modeling is the definition of the micro-roughness direction, and a recommendation is given to indicate the directions of micro-roughness in the drawings of the cutting tool in order to mearure roughness taking into account the requirements of regulatory and technical documentation.
{"title":"GRAPHO-ANALYTICAL MODELING OF ROUGHNESS OF THE CUTTING TOOL FRONT HELICAL SURFACE","authors":"V. Istotsky","doi":"10.30987/2782-5957-2023-5-4-13","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-5-4-13","url":null,"abstract":"The paper deals with a method for grapho-analytical modeling of micro-roughness (surface roughness) formed on the helical front surface of a cutting tool during its manufacture or resharpening using CNC grinding machines and grinding wheels with a simple shape of the generative surface. A simulation model of roughness on the formed front surface is presented, and a calculation scheme for determining its value is made. Based on the statistical results of the formed technological 3D models of helical front surfaces, the resulting equations of complete factorial experiments are presented, taking into account the combined influence of factors. Graphs of the normal distribution of the roughness parameter and the parameter of the grinding wheel installation affecting it are given. It is shown that an important result of modeling is the definition of the micro-roughness direction, and a recommendation is given to indicate the directions of micro-roughness in the drawings of the cutting tool in order to mearure roughness taking into account the requirements of regulatory and technical documentation.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133421861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-12DOI: 10.30987/2782-5957-2023-4-47-61
I. Andreev, Dmitry Shcheglov
A method to implement improvement projects in the lean manufacturing management system (LMMS) of a military-industrial complex enterprise (MIC) is proposed, which is developed on the basis of the scientific and methodological apparatus of the modern theory of lean manufacturing (LM), as well as on the principles of scientific labor organization and project management. The algorithm of implementing the successful life cycle of such projects in the military-industrial complex enterprise is considered. A comprehensive system to evaluate the proposed improvement projects is presented, which allows determining the priority of the project in improvement activities. The best cases of implementing improvement projects are considered by the example of JSC "Obukhov Plant".
{"title":"METHOD TO IMPLEMENT IMPROVEMENT PROJECTS IN THE LEAN MANUFACTURING MANAGEMENT SYSTEM OF A MILITARY-INDUSTRIAL COMPLEX ENTERPRISE","authors":"I. Andreev, Dmitry Shcheglov","doi":"10.30987/2782-5957-2023-4-47-61","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-4-47-61","url":null,"abstract":"A method to implement improvement projects in the lean manufacturing management system (LMMS) of a military-industrial complex enterprise (MIC) is proposed, which is developed on the basis of the scientific and methodological apparatus of the modern theory of lean manufacturing (LM), as well as on the principles of scientific labor organization and project management. The algorithm of implementing the successful life cycle of such projects in the military-industrial complex enterprise is considered. A comprehensive system to evaluate the proposed improvement projects is presented, which allows determining the priority of the project in improvement activities. The best cases of implementing improvement projects are considered by the example of JSC \"Obukhov Plant\".","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126456926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-12DOI: 10.30987/2782-5957-2023-4-11-18
L. Kondratieva
The objective is to study the possibility of ob-taining titanium silicide using the azide technology of self-propagating high-temperature synthesis (SHS-Az) in silicon-titanium halide-sodium azide system. The task to which the paper is devoted is to find the optimal composition of the charge, which combus-tion gives the opportunity to obtain titanium halide by SHS-Az method. Research methods: the study of the titanium sil-icide synthesis in powder is carried out in the mode of solid-flame combustion in SHS-Az laboratory reactor. The synthesized powders are subjected to studies al-lowing to define the phase composition and structure. The studies are carried out using a diffractometer and a scanning electron microscope. The novelty of the work is in synthesizing tita-nium silicide not only by a new method in the mode of high-temperature combustion of the heterogeneous silicon-titanium halide-sodium azide system, but also by obtaining a powder with close values to the range of nanoparticles. Study results of obtaining titanium silicide by SHS-Az method from the heterogeneous silicon-titanium halide-sodium azide system show that the target product is a finely dispersed mixture of particles of equal shape but of different phase composition: Ti5Si3, TiSi2, TiN, Si, Ti. The average particle size is equal to 150-200 nm. Conclusions: it is found that Ti5Si3 and TiSi2 ti-tanium silicides can be obtained in the combustion mode by SHS-Az method from silicon-titanium halide-sodium azide system.
{"title":"SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS OF TITANIUM SILICIDE IN SILICON-TITANIUM HALIDE-SODIUM AZIDE SYSTEM","authors":"L. Kondratieva","doi":"10.30987/2782-5957-2023-4-11-18","DOIUrl":"https://doi.org/10.30987/2782-5957-2023-4-11-18","url":null,"abstract":"The objective is to study the possibility of ob-taining titanium silicide using the azide technology of self-propagating high-temperature synthesis (SHS-Az) in silicon-titanium halide-sodium azide system. \u0000The task to which the paper is devoted is to find the optimal composition of the charge, which combus-tion gives the opportunity to obtain titanium halide by SHS-Az method. \u0000Research methods: the study of the titanium sil-icide synthesis in powder is carried out in the mode of solid-flame combustion in SHS-Az laboratory reactor. The synthesized powders are subjected to studies al-lowing to define the phase composition and structure. The studies are carried out using a diffractometer and a scanning electron microscope. \u0000The novelty of the work is in synthesizing tita-nium silicide not only by a new method in the mode of high-temperature combustion of the heterogeneous silicon-titanium halide-sodium azide system, but also by obtaining a powder with close values to the range of nanoparticles. \u0000Study results of obtaining titanium silicide by SHS-Az method from the heterogeneous silicon-titanium halide-sodium azide system show that the target product is a finely dispersed mixture of particles of equal shape but of different phase composition: Ti5Si3, TiSi2, TiN, Si, Ti. The average particle size is equal to 150-200 nm. \u0000Conclusions: it is found that Ti5Si3 and TiSi2 ti-tanium silicides can be obtained in the combustion mode by SHS-Az method from silicon-titanium halide-sodium azide system.","PeriodicalId":289189,"journal":{"name":"Transport engineering","volume":"14 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120824594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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