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.

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.

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.

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.

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.

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.