Vestnik Brianskogo gosudarstvennogo universiteta最新文献

{"title":"Design and analysis of technical characteristics of a quick-release device for connecting the ropes ends for mobile ropeways","authors":"V. Tarichko","doi":"10.22281/2413-9920-2022-08-02-131-141","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-02-131-141","url":null,"abstract":"The quick-release devices of the ends of the carrying and traction ropes, which have the load capacity required by the tension condition of the rope system and a gentle mechanical effect on the structural elements of steel ropes, make it possible to ensure the rapid deployment and dismantling of mobile ropeways in the conditions of elimination of natural or man-made emergencies. The article discusses the design of the original device that provides a reliable and quick-release connection of the ends of the ropes, and also developed a mathematical model for predicting the load capacity of the specified device. The results of the analysis of the influence of the main design parameters of the connected ropes and fasteners of the device under consideration, as well as the mechanical deformation characteristics of steel ropes on the load capacity of the quick-release device are presented. The calculated dependences for the design of a quick-release device are proposed, taking into account the loading of the rope system during the operation of a mobile ropeway, as well as a methodology for selecting the existing standard size of the connecting device for the specified operating conditions.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"157 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75755601","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}

{"title":"Simulation of the hydraulic drive operation of the end tower installation mechanism on a self-propelled chassis as part of a mobile ropeway","authors":"A. Lagerev","doi":"10.22281/2413-9920-2022-08-02-110-124","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-02-110-124","url":null,"abstract":"Single-span ropeways based on autonomous self-propelled wheeled chassis of high load capacity and cross-country capability are a promising type of mobile transport and overloading equipment for the rapid creation of logistics infrastructure for the sustainable development of hard-to-reach areas with complex natural terrain. They can also be effectively used for rapid deployment during transport operations in the foci of natural or man-made disasters. This article presents a mathematical model of the operation of a hydraulic drive with throttle control with sequential activation of adjustable throttles and a power hydraulic cylinder in relation to the mechanism of installing the end tower on the load-bearing frame of a self-propelled wheeled chassis of a mobile ropeway. The model includes a submodel of kinematic and force analysis of the end tower installation mechanism and a submodel of hydrodynamic analysis of working processes in the volumetric pumping hydraulic drive of this mechanism. The established calculated dependences make it possible to simulate the change during the time of installation of the end tower from the transport position to the working position of the basic quantitative parameters, including the speeds and accelerations of movement of the end tower and the rod of the lifting hydraulic cylinder, pressures and volumetric flow rates of the working fluid at characteristic points of the hydraulic system.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91062312","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}

{"title":"The dynamic loading study of a mobile transport and technological machine, placed on a slope","authors":"A. Khimich, I. Lagerev","doi":"10.22281/2413-9920-2022-08-02-159-164","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-02-159-164","url":null,"abstract":"The paper considers approaches to modeling the dynamics of a mobile cable lifting machine, the working body of which is moved along a linearly extended cable using a winch. The mobile machine consists of two spatially spaced modules placed on the slope, and is secured by a cable car. A mathematical model has been developed that takes into account the vibrations of the working body on the traction and load-bearing ropes when it moves along the slope. Numerical integration of the equations of motion is carried out. The results are analyzed.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76858472","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}

{"title":"Inversion approach to traction calculation of tracked chassis of hoisting, construction and road machines","authors":"K. Goncharov","doi":"10.22281/2413-9920-2022-08-02-94-102","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-02-94-102","url":null,"abstract":"Tracked chassis are a common variant of the implementation of the movement mechanisms of hoisting-and-transport, construction, road machines, which has a number of advantages compared to rail-wheel, pneumatic-wheel and walking mechanisms, in particular, the absence of the need to equip work sites, as well as improved driving performance when moving over rough terrain. This article proposes an inversion approach to the traction calculation of a tracked chassis, which consists in presenting its traction and bearing element in the form of a closed loop, which makes it possible to apply the basic provisions of the theory of traction calculation of continuous transport machines to determine the resistance to movement and, accordingly, tensions in the contour of the track. The proposed approach makes it possible to estimate the contribution of various motion resistances to the total tractive effort during rectilinear motion, depending on the design features of each characteristic section of the track, taking into account the redistribution of the load between different tracks of the same chassis. The results obtained can be applied both in the design of classic special machines on a tracked chassis, and in the development of prototypes of tracked vehicles with displaced load application centers, in particular, tracked chassis of mobile transport and handling rope complexes.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83557816","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}

{"title":"Load study of the linear-extended structures when using crimping devices","authors":"A. Khimich, A. Artyomova, D. Perminova, I. Lagerev","doi":"10.22281/2413-9920-2020-06-04-70-75","DOIUrl":"https://doi.org/10.22281/2413-9920-2020-06-04-70-75","url":null,"abstract":"The article presents scientific approaches to the study of the stress-strain state of linearly extended structures containing crimping devices. Examples of such structures include rope systems, pipelines for transporting media under pressure. The study of the stress-strain state of a gas pipeline on which a steel coupling used for the repair of substructures is installed is considered in detail.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74983915","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}

{"title":"Method of estimation of PM10 fine particle concentration during operation of centrifugal friction rollers","authors":"E. Safronov, A. Nosko, I. Sharifullin, A. S. Guskova","doi":"10.22281/2413-9920-2022-08-01-61-69","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-01-61-69","url":null,"abstract":"One of the solutions to increase the storage capacity and speed of handling palletized goods in warehouses is the use of gravity pallet racking. As elements of the safe operation of such conveyors, centrifugal friction rollers are widely used, which ensure the speed of the pallet within the limits that do not exceed the permissible values. During the operation of centrifugal friction rollers, wear products — brake dust, which have an adverse effect on the human body, may enter the atmosphere. Therefore, an urgent task is to study the operation of friction-type brake rollers from the point of view of the environmental assessment of the released brake dust. The paper assesses the concentration of fine particles with dimensions from 10 micrometers to 2.5 micrometers during the operation of centrifugal friction rollers in gravity pallet racks, and proposes a method for estimating their concentration in the warehouse working area. The coefficient of environmental friendliness of the design of the brake roller of the friction type has been introduced, which is one of the factors determining the maximum number of braking, and takes values from 0 to 1.0 for various designs of the friction roller — closed type, ventilated and open type. The results of an experimental study of materials for friction pairs of brake rollers show that the maximum amount of braking is provided at a pressure on the friction lining of 0.1 MPa, which corresponds to a pallet weight of 1000 kg. An example of using the methodology for estimating the concentration of particles in the working area for a warehouse consisting of one block of gravity racks for pallets 1200x800x1500 mm (length x width x height), weighing 1000 kg, with a total number of 546 pallet places is considered. Analysis of the results showed that the maximum number of pallet braking at which the maximum permissible concentration of particles with a dimension of 10 micrometers to 2.5 micrometers is reached and the maximum turnover of the warehouse can serve as a comprehensive assessment of its environmental friendliness.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"26 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83608433","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}

{"title":"A general approach to the creation of digital twins of mobile ropeways based on mobile transport and reloading rope units","authors":"A. Lagerev, I. Lagerev","doi":"10.22281/2413-9920-2022-08-01-38-60","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-01-38-60","url":null,"abstract":"The article considers the conceptual approach and practical aspects of creating digital twins of mobile ropeways formed by two end mobile transport and reloading rope units based on self-propelled multi-axle wheeled chassis of high load capacity and cross-country ability. The approach is based on a systematic representation and analysis of the design and operating modes of a mobile ropeway. As a consequence, the digital twin is formed as a multilevel hierarchical structure. It combines information mathematical models of various functional purposes and varying degrees of mutual connectivity, which are distributed by levels depending on the degree of complexity and the possibility of their further aggregation into information mathematical models of a higher level. In relation to a typical mobile ropeway, a structural and functional analysis was carried out, on the basis of which its basic components were established, and calculated structural elements (technical devices and systems) were determined, requiring the development of the necessary individual information mathematical models. Approaches to aggregation of several individual models of computational elements connected by common characteristic quantitative parameters of modeling into group information mathematical models, and then into mode and complete information mathematical models of structural and functional components of a mobile ropeway are considered. The system approach considered in the article and the multilevel hierarchical structure of the digital twin developed on its basis are useful and effective from the point of view of ensuring the modularity of creating a digital twin, its modification for mobile ropeways of a different design, the possibility of using previously developed information mathematical models for similar computational structural elements.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78939538","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}

{"title":"Analysis of climate variables in the upper Amu Darya river basin in Tajikistan","authors":"A. Gulakhmadov","doi":"10.22281/2413-9920-2022-08-01-76-85","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-01-76-85","url":null,"abstract":"This article presents the results of the trend analysis of precipitation, maximum and minimum temperatures in the upstream of Amu Darya River Basin in Tajikistan. The result showed that in the south part of Tajikistan the trend of the summer and winter seasons indicate a positive and the temperature rises in summer and winter. In the north and central part of Tajikistan, there is also a positive trend in summer and winter with the exception of the Rasht and Murgab stations, where was recorded a decreasing trend in air temperature in summer. The eastern part of Tajikistan, where the high-altitude territory begins, the temperature trend shows that the summer period of the year becomes slightly cooler, and the winter period shows an increasing temperature trend, i.e. it is getting warmer. On the flat plain areas of Tajikistan, a relative increase in precipitation is observed, and the amount of precipitation in the high-mountain zone (eastern Pamir) decreases according to long-term data. This study shows pronounced climatic fluctuations in Tajikistan, changes in air temperature and precipitation conditions.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87966321","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}

{"title":"The results of scientific research of Bryansk state university in 2021 in the field of design and modeling of work processes in mobile transport and overloading rope complexes","authors":"T. A. Stepchenko, O. Babich","doi":"10.22281/2413-9920-2021-08-01-07-26","DOIUrl":"https://doi.org/10.22281/2413-9920-2021-08-01-07-26","url":null,"abstract":"The results of scientific research activities of scientists of the Academician I.G. Petrovskii Bryansk State University in the development of promising domestic samples of designs of mobile transport and reloading rope systems and ropeways based on self-propelled wheeled chassis of high carrying capacity and cross-country ability and the creation of scientifically substantiated methods for their design and computer simulation of work processes during operation. The description and analysis of the effectiveness of new technical solutions of mobile passenger and cargo aerial ropeways are given.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83896140","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}

{"title":"Thermal diagnosis system of belt conveyors","authors":"K. Goncharov","doi":"10.22281/2413-9920-2022-08-01-27-37","DOIUrl":"https://doi.org/10.22281/2413-9920-2022-08-01-27-37","url":null,"abstract":"Belt conveyors are one of the most difficult objects of technical condition diagnostics due to the interaction of elements of the work process of various genesis on extended sections of the routes: bulk cargo — elastic load-carrying belt — rigid load-bearing structures. Differences in the nature of the origin and the features of the mechanical operation of these elements suggest the presence of a differentiated approach to diagnosing the technical condition of belt conveyors when operating with the use of specific equipment. At the same time, in modern industrial conditions, diagnostic methods based on new or previously unused physical phenomena are widely used. The article is the first to propose a system for thermal diagnostics of units, assemblies and elements of belt conveyors, based on the results of a number of experimental studies. The advantages and disadvantages of thermal diagnostics of transporting machines in motion are shown. The basic provisions of thermal diagnostics are proposed, which make it possible to harmoniously integrate the proposed system into a well-established set of measures for monitoring the technical condition of belt conveyors at the stages of installation and operation in the form of additional recommendations and reporting documents. The results of experimental studies of the working processes of belt conveyors by the method of thermal diagnostics are generalized and element-by-element recommendations for conducting thermal control are developed, combined into a general method.","PeriodicalId":34506,"journal":{"name":"Vestnik Brianskogo gosudarstvennogo universiteta","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89634544","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}