Vestnik Brianskogo gosudarstvennogo universiteta最新文献_第3页

THE UKRAINIAN CRISIS IN THE PUBLICATIONS OF EGYPTIAN THINK CENTERS 埃及思想中心出版物中的乌克兰危机

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-31 DOI: 10.22281/2413-9912-2023-07-01-07-17

A. Adrianov

{"title":"THE UKRAINIAN CRISIS IN THE PUBLICATIONS OF EGYPTIAN THINK CENTERS","authors":"A. Adrianov","doi":"10.22281/2413-9912-2023-07-01-07-17","DOIUrl":"https://doi.org/10.22281/2413-9912-2023-07-01-07-17","url":null,"abstract":"The article analyzes the publications of three key Egyptian think tanks on the causes, consequences and global context of the Ukrainian crisis, as well as its impact on the Middle Eastern countries and Egypt’s position. The author examines the publications of think tanks that are able to influence foreign policy decisions in Egypt. In this way the author seeks to assess the potential for Egypt changing its position on the Russian SMO, as well as analyse the prevailing views on the impact of the Ukrainian crisis on international relations among the Egyptian expert community. In their publications, the Egyptian think tanks focus on the three key topics: the global context of the Ukrainian crisis and its consequences for the system of international relations, the impact of the Ukrainian crisis on the situation in the Middle East, and Egypt’s position on the Ukrainian crisis. Egyptian experts see the Ukrainian crisis as a manifestation of great-power competition and view it as a starting point for future changes in the world order. At the same time, they clearly see its negative consequences for the economic situation in the Middle Eastern countries and especially in Egypt, however, they highly value the neutral position taken by Cairo","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47969436","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}

引用次数: 0

Assessment of possible cable car accidents by employee competencies using neural networks 基于神经网络的员工胜任能力评估缆车事故可能性

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-79-86

A. Panfilov, N. Nikolaev, R. V. Khvan, A. Korotkiy

引用次数: 0

The effect of the thermal conductivity by the materials of contact surfaces on the heat balance of the jet-grouting drill stem hydraulic elements 接触面材料导热系数对喷浆钻杆液压元件热平衡的影响

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-71-78

V. Novikov

{"title":"The effect of the thermal conductivity by the materials of contact surfaces on the heat balance of the jet-grouting drill stem hydraulic elements","authors":"V. Novikov","doi":"10.22281/2413-9920-2023-09-01-71-78","DOIUrl":"https://doi.org/10.22281/2413-9920-2023-09-01-71-78","url":null,"abstract":"The paper is deals with the influence of thermal conductivity and the materials of the contact surfaces of the drill shaft and the sealing element on the change in the thermal balance of the structural unit «drilling string» used in the jet grouting technology to fix weak and unstable types of soils. A model with nodes for the computational grid of the “hydraulic puller” assembly unit is shown, part of which are the considered drill shaft and sealing elements. The temperature values are calculated by the finite element method in the «Siemens Femap’s» environment depending on the change in the thermal conductivity coefficients of the contacting elements. Calculations were carried out for the fourth part of the indicated model, due to the axisymmetry of the problem being solved, this made it possible to significantly reduce the amount and time of calculations. Graphs of the corresponding dependence are constructed for a number of points located in the characteristic areas of the hydraulic stripper. Also, by power regression, expressions were obtained that allow calculating the temperature values in the indicated areas of the considered assembly. The obtained dependencies will make it possible in the future to select the material for the drill shaft of the hydraulic puller based on the optimal ratio of the thermal conductivity of the shaft, its corrosion resistance, determined by the chemical composition of the steel and the thermal conductivity of the sealing.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83646609","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}

引用次数: 0

Methodological aspects of creating frames for low-power vehicles (ATVS) based on tubular profiles 基于管状型材的低功率车辆(ATVS)车架制造方法方面

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-49-58

N.V. Dalida, N. Filkin, D. Scuba

引用次数: 0

Alternative variants analysis of single-span mobile ropeways based on self-propelled chassis 基于自走式底盘的单跨移动索道备选变型分析

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-101-111

V. Tarichko, I. Lagerev

{"title":"Alternative variants analysis of single-span mobile ropeways based on self-propelled chassis","authors":"V. Tarichko, I. Lagerev","doi":"10.22281/2413-9920-2023-09-01-101-111","DOIUrl":"https://doi.org/10.22281/2413-9920-2023-09-01-101-111","url":null,"abstract":"Currently, mobile ropeways are considered as one of the promising types of rapidly deployable transport systems, which are formed with the help of two transport and reloading rope complexes based on autonomous self-propelled multi-purpose chassis combined by a single aerial carrying-traction rope system. The key problem in creating effective mobile ropeways of this type is the choice of their rational design, which allows to obtain the best tactical and technical characteristics and quality indicators as a result of the design. The article presents and analyzes possible alternative variants of single-span mobile ropeways based on mobile transport and reloading rope complexes. Based on the results of the comparative analysis, the most preferred variant was established — a single-span single rope mobile ropeway of the pendulum type with a carrying-traction rope system in the form of a closed carrying-traction rope with two parallel branches. The article considers the typical design of the most preferred variant and describes the principle of its operation, as well as lists the main components and mechanisms of the main technological equipment, which should be part of mobile transport and reloading rope complexes.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"125 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78467855","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}

引用次数: 0

Application of topology optimization in the design of elements of load handling devices 拓扑优化在装卸装置元件设计中的应用

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-28-38

S. Gnezdilov

{"title":"Application of topology optimization in the design of elements of load handling devices","authors":"S. Gnezdilov","doi":"10.22281/2413-9920-2023-09-01-28-38","DOIUrl":"https://doi.org/10.22281/2413-9920-2023-09-01-28-38","url":null,"abstract":"The article provides guidelines for the implementation of conceptual topology optimization. By «conceptual» is meant optimization, the result of which is not a specific design solution, but a rational topology – a structure that best transmits the given force flows. In accordance with the above recommendations, it is proposed to carry out optimization in the following sequence: determining the object of study, searching for points of application of external forces to the object and substantiating (if necessary) their most rational relative location, determining the nature of external forces at the points of their application, applying connections, taking into account other factors and analysis of the results with their possible refinement. Particular attention is paid to the issue of constructing a loading diagram for topology optimization, which, in the author’s opinion, largely determines the success of solving the problem. A correctly prepared loading diagram should take into account all the most unfavorable combinations of loads. Recommendations on the most rational construction of loading diagrams are given. The recommendations given in the article are tested on a practical example, which considers the procedure for optimizing the load grip lever. Such a grip has a complex nature of loading, and therefore its most rational structure is not obvious. Therefore, in order to search for a rational design of its elements, it is advisable to use conceptual topology optimization. Optimization made it possible to reduce the mass of the lever of such a grip by 42%. At the same time, the strength of the new solution increased by 15%, and the stiffness increased by 49%.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"221 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83648939","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}

引用次数: 0

Experimental study of the deformed state of metal structures of load trolleys of overhead cranes with a multipurpose layout drawing 基于多用途布置图的桥式起重机载重小车金属结构变形状态试验研究

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-59-70

I. Denisov

{"title":"Experimental study of the deformed state of metal structures of load trolleys of overhead cranes with a multipurpose layout drawing","authors":"I. Denisov","doi":"10.22281/2413-9920-2023-09-01-59-70","DOIUrl":"https://doi.org/10.22281/2413-9920-2023-09-01-59-70","url":null,"abstract":"Deformations of the supporting metal structures of machines for various purposes have a significant impact on the performance of the equipment installed on them. Insufficient rigidity of a metal structure can cause jamming and failure of drive elements and working bodies of material handling, construction and road machines, the operation of which is associated with the impact of high static and dynamic loads. Therefore, when designing new structural schemes of load-bearing metal structures, special attention must be paid to the issue of ensuring the necessary rigidity. The presented work contains the results of an experimental assessment of the deformed state of physical models of the metal structures of load trolleys of overhead cranes, made on the basis of a multipurpose layout drawing using various types of connections of bearing elements. The article reflects information about the methodology of experimental research, describes the features of the physical models of metal structures used in the course of the experiment. The data on the vertical displacements of the control points of metal structures when using various loading schemes are given. An assessment was made of the influence of the type of applied connections of load-bearing elements on the features of the resulting deformed state of the metal structure. A comparative analysis of experimental data and calculated values of vertical displacements of points of metal structures obtained as a result of computer simulation of the formed state using various finite element models is performed.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80929874","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}

引用次数: 0

The results of Bryansk State University scientific research in 2022 in the field of creation of mobile ropeways and forest rope units based on self-propelled wheeled chassis 布良斯克国立大学于2022年在基于自行轮式底盘的移动索道和森林绳索装置领域的科研成果

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-09-27

T. A. Stepchenko, O. Babich

引用次数: 0

Algorithmization of the problem of videoscopic evaluation of the steel ropes state 钢丝绳状态可视评估问题的算法研究

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-87-100

A. Panfilov, A. Yusupov, M. Gavrikov, R. Sinetsky

{"title":"Algorithmization of the problem of videoscopic evaluation of the steel ropes state","authors":"A. Panfilov, A. Yusupov, M. Gavrikov, R. Sinetsky","doi":"10.22281/2413-9920-2023-09-01-87-100","DOIUrl":"https://doi.org/10.22281/2413-9920-2023-09-01-87-100","url":null,"abstract":"The paper considers the problem of monitoring the technical state of steel ropes used in industrial and civil installations, such as elevators, cable cars, lifts, etc. To date, the assessment of the state of steel ropes and the safety of their operation is carried out mainly through visual-instrumental control, which is long in time and subject to the influence of the human factor, which determines the relevance of the task of automating this process using computer technology and artificial intelligence methods in order to improve the quality of the assessment, reducing the check interval, detecting defects in steel ropes at an early stage. The article proposes two approaches to the algorithmizing of the problem of videoscopic control of the state of steel ropes using computer vision technologies, based on software modeling of the logic of visual analysis and machine learning methods, such as deep learning artificial neural networks. The authors have developed algorithms for automatic detection of the main types of defects in images of the surface of steel ropes: increase/decrease in diameter, deformation in the form of rope, breaks in the outer wires, thermal and electric damage. The paper presents the results of preliminary testing of the developed algorithms and programs, the composition and methods for determining the main indicators for evaluating their effectiveness are proposed.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83258171","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}

引用次数: 0

Methodology for identifying and assessing the significance of factors affecting the accident rate of cranes 起重机事故率影响因素的识别与评估方法

Vestnik Brianskogo gosudarstvennogo universiteta Pub Date : 2023-03-25 DOI: 10.22281/2413-9920-2023-09-01-39-48

M. Gorelova, L. Sladkova

{"title":"Methodology for identifying and assessing the significance of factors affecting the accident rate of cranes","authors":"M. Gorelova, L. Sladkova","doi":"10.22281/2413-9920-2023-09-01-39-48","DOIUrl":"https://doi.org/10.22281/2413-9920-2023-09-01-39-48","url":null,"abstract":"Analysis of the sources of scientific and technical literature shows that the main factors that cause the accident rate of lifting structures are factors of manmade, natural and «human» characters. The article proposes a methodology for identifying and assessing the significance of factors that are, at first glance, indirect, but have a significant impact on the causes of the accident rate of boom self-propelled cranes. The proposed methodology consists of three stages, each of which separately is quite well tested by other authors. At the first stage, based on the analysis of expert assessment according to the Hay method, it is proposed to identify significant factors. At the second stage, on the basis of the chi-squared criterion, the significance of the factor is assessed. At the third stage, a methodology for conducting a numerical experiment is proposed to assess the significance of factors based on the use of neural networks. Obviously, the proposed methodology can also be used in assessing the significance of factors of other events, and not only in case of accident rate of lifting structures.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88719965","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}

引用次数: 0