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  • Study of the operation of computer vision methods in conditions of changing illumination for embedded systems

    The article consider the influence of illumination and distance on the recognition quality for various models of neural networks of embedded systems. The platforms on which the testing was carried out, as well as the models used, are described. The results of the study of the influence of illumination on the quality of recognition are presented.

    Keywords: artificial intelligence, computer vision, embedded systems, pattern recognition, YOLO, Inception, Peoplenet, ESP 32, Sipeed, Jetson, Nvidia, Max

  • Pulse control of electromagnetic drives

    The article proposes a variant of an electromagnetic drive for controlling an unmanned aerial vehicle for monitoring power facilities and develops calculation ratios that determine its electromechanical and dynamic processes. The structure and main characteristics of the pulse drive control have been developed. The conducted research can be used in the implementation of the steering drive project of a modern unmanned aerial vehicle.

    Keywords: electromagnetic drive, pulse control, multipolar pulse width modulation, block diagram, magnetic induction, moment, constant, pulse element, control current, inertia

  • Modern digital capabilities to provide incoming and ongoing construction quality control

    The prospect is explored to arrange for incoming and ongoing quality control using digital tools and devices, including those supplanting conventional ones. The paper underscores the importance of integrating digital quality control technologies and BIM technologies as a means to identify potential defects and justifies the relevance of improving the gesture control code for quality control purposes. It further summarizes the quality control techniques and procedures and highlights an opportunity to develop digitalized quality control charts based on effective conventional documents.

    Keywords: integration of BIM, VR and АR technologies, laser scanner, ongoing quality control chart, digital quality information model

  • Features of urban development of the territories of the city of Vyborg outside the boundaries of the historical core

    The main maintenance of a diversification of production as activity of subjects of managing is considered. being shown in purchase of the operating enterprises, the organizations of the new enterprises, redistribution of investments in interests of the organization and development of new production on available floor spaces. The most important organizational economic targets of a diversification of management are presented by innovative activity of the industrial enterprise.

    Keywords: historical settlement of federal significance, Vyborg, Leningrad region, territorial planning, urban development

  • The use of carbon fiber-based FRP systems to strengthen reinforced concrete structures of buildings and structures

    The article provides an analysis of the state of the rationing issue in terms of performing the calculation justification and design of reinforcement of reinforced concrete structures using external reinforcement systems based on carbon fibers. The normative documents of the Russian Federation and foreign ones are considered, the analysis of the use of external reinforcement based on composite materials for structures of various types of work is carried out, the disadvantages of existing calculation and design methods are highlighted. In conclusion, recommendations are given on the appropriate improvement of calculation and design methods.

    Keywords: external reinforcement, carbon fiber, reinforcement, restoration

  • The methodology of full-scale testing of reinforced concrete beams as part of a ribbed monolithic floor

    In accordance with the requirements of Federal Law No. 384-FZ, the safety and reliability of buildings and structures must be ensured. One of the ways to confirm the safety and reliability of building structures is to conduct field tests. The authors of this article have developed a method for full-scale testing of a reinforced concrete beam with a span of 14.52 m as part of a monolithic reinforced concrete ribbed floor. The procedure for testing the beam was drawn up with the development of measures to ensure safety during work, the adjustment of the beam testing method by loading was performed, the beam was tested by loading method with fixation of its deflections, followed by analysis of the test results. The test results showed that the developed method can be used as a full-scale test to confirm the safety and reliability of building structures, namely horizontal reinforced concrete structures.

    Keywords: building structures, beam, destruction, safety, methodology, technical condition, field tests

  • Development of a behavior pattern for a game bot with artificial intelligence elements based on Markov chains

    The subject of this article is the development of a behavior pattern with AI elements for an opponent bot in the single-player game Steal Tower. The essence of which is to collect resources to build a tower faster than opponents. To create the illusion that the same people are playing against the player, an imitation stochastic model based on the Monte Carlo method for Markov chains has been developed. Based on the results of its tests, balanced system parameters were determined, which are embedded in the behavioral pattern of the bot, which is implemented using the Enum AIStates enumeration consisting of five states: Idle (inactivity), GoTo (movement) and GoToWarehouse (return to the warehouse), Win (victory), Loose (scoring). Each of them has developed functions for the optimal behavior of the bot given in the article. So for the GoTo state, functions have been created that analyze the benefits of different types of behavior: steal or collect, or walk to the warehouse or to the tower.

    Keywords: game intelligence, behavioral pattern, live world emulation, bot behavior scenario, state structure, Markov chains, Monte Carlo method, simulation model, Unity environment, C# language

  • Comparison of results of analytical and simulation modelling of the process of selective assembly of two elements taking into account measurement errors during sorting

    The validity of analytical models of the process of one-parameter selective assembly of two elements was evaluated by comparison with the results of simulation modelling. A series of machine experiments including one-factor and two-factor experiments were carried out. At the accepted levels of variation of factors, the confidence interval of the probability of yield of good products from the initial population of elements that did not pass sorting was determined using Student's criterion at the given level of significance and number of degrees of freedom. Comparison of the simulation results revealed the facts of reaching the specified process indicator, determined by the analytical model, for all experiments within the confidence intervals and the presence of relatively small deviations from their centres.

    Keywords: selective assembly, analytical model, simulation model, measurement error, simulation results

  • Changing the elastic characteristics of the base in depth

    Changes in the elastic characteristics of the soil for a base model that is inhomogeneous in depth are considered. The dependences of the modulus of elasticity of the soil and the coefficient of lateral pressure on the relative depth are obtained.

    Keywords: modulus of elasticity, lateral pressure coefficient, pressure, compression curve

  • Determining the possibility of using alluvial soil from Lake Chernoye in the city of Kurgan for the purpose of engineering preparation of the territory

    Engineering preparation of the territory for the construction and development of a residential complex is a difficult task. In the development area, fluctuations in the groundwater level are possible due to natural processes - flooding of the territory or during operation due to man-made processes. The work presents the results of the survey and assesses the impact of future construction on the hydrological situation of the built-up areas. Materials from engineering-geological surveys of the composition of soils in the lake water area and the building area were studied in order to determine the possibility of using alluvial soil from the lake for engineering preparation of the territory.

    Keywords: engineering and geological surveys, urban development, alluvial soil, engineering preparation of the territory

  • Mathematical modeling of heat transfer and hydrodynamics in plate-fin heat exchangers with corrugated fins

    A numerical study of heat transfer and hydrodynamics in plate heat exchangers with corrugated fins was carried out. The effect of corrugation pitch on heat flow and pressure drop was studied. The study was carried out using computational fluid dynamics in the ANSYS software package (v. 19.2). The results of the study showed that increasing the corrugation pitch from n = 5 to n = 9 leads to an increase in heat flow of 10.83% and a pressure drop of 28.30%.

    Keywords: plate-fin heat exchanger, corrugated fins, heat transfer, hydrodynamics, numerical study, calculation, heat flow, pressure drop, energy efficiency, cooling system

  • Overview of common nodal joints for 3D modular building blocks and individual structural elements

    The overview of the existing horizontal and vertical nodal joints for 3D modular building blocks and plane elements has shown that tongue and groove is the most commonly used connection today. Other types of module attachments are also discussed. Special attention is paid to a modular integrating system encompassing a design description. It is emphasized that the efficiency of modular construction depends, among others, on nodal joints used therein.

    Keywords: modular construction systems, operational reliability, horizontal and vertical attachments, coupling bolts, tongue and groove connection

  • Features of the architecture design of rehabilitation centers for combatants

    The functional and spatial aspects of the formation of the architectural environment of medical rehabilitation and rehabilitation centers for injured athletes are investigated. The theoretical basis on the problems of functioning of similar facilities - rehabilitation centers for the disabled is considered, the characteristic components of the environment are identified, as well as the technological stages of the rehabilitation process. The generalization of the best Russian experience and existing architectural and planning solutions of medical institutions with rehabilitation functions is carried out. A comparative analysis of analog facilities was carried out in three conditional groups: a) large medical centers with rehabilitation functions for the disabled; b) multidisciplinary rehabilitation centers; c) specialized rehabilitation centers for athletes. A number of promising approaches and trends are identified that can be applied to the formation of conceptual models and adaptive architectural and environmental solutions for sports medicine and rehabilitation centers.

    Keywords: rehabilitation center for athletes, functional-spatial, architectural-planning, environmental solutions, models, approaches

  • Calculation of concrete elements in conditions of uneven all-round compression

    The cases of uneven compression of a concrete cylinder in the case of simple loading and comprehensive uneven compression of a spiral-reinforced concrete cylinder under disproportionate loading are considered. The dependences of longitudinal, transverse and volumetric deformations on longitudinal stress are obtained.

    Keywords: longitudinal stress, circumferential stress, longitudinal deformation, circumferential deformation, spiral reinforced concrete strut, shear strain intensity, shear stress intensity

  • Localization of round objects in images using fast radial symmetry transform

    Currently, there is an increase in the number of scientific papers on models, methods and software and hardware for image processing and analysis. This is due to the widespread introduction of computer vision technologies into information processing and control systems. At the same time, approaches that provide fast image processing in real time using limited computing resources are relevant. Such approaches are usually based on low-level image filtering algorithms. One of the tasks to be solved in computer vision-based systems is the localization of round objects. These objects have the property of radial symmetry. Therefore, the approach based on the Fast Radial Symmetry Transform, which is considered in this paper, is effective for solving this problem. The paper describes the basic steps of the basic transformation, provides a procedure for determining the centers of radially symmetric areas for localization of round objects in images, and discusses examples of its application.

    Keywords: computer vision, image processing, image analysis, localization of objects, methods of localization of round objects, fast radial symmetry transf, detecion of the centers of radially symmetric areas