The paper is based on a review of the scientific publications released from May through October 2019, the greater part of which, namely 14 papers, is included in the Web of Science scientometric database. The authors of the papers analyzed explore the construction industry problems over the past 5 years. The foreign studies listed in the reference section were based on the analysis of reviews falling in the above-mentioned timeline. The purpose of this paper is to identify the problems hindering the implementation of BIM technologies in the construction sector, not only in the foreign countries, but also in Russia.
Keywords: building information modeling, construction organizations, critical problems, external factors, absence of organizational support
This article is a short review of modern three-dimensional printers used in additive construction production (ASP). The main goal of the article is to analyze the main types of existing 3D printers for ASP. The features of their design and methods of use are described, as well as their advantages and disadvantages when used in additive construction production are identified.
Keywords: construction, additive building production (ABP), additive technology (AT), building 3D-printing, extrusion 3D-printing, building 3D-printer
Launch and control circuit systems built on traditional devices represent complicate multi-link system. Its liability is determined by a number of intermediate devices. Launch jaggedness – is one of the significant flaws, negatively affect on launching process dynamics. Promising direction of launch and control circuits devices are rheostats built on high current semi-conduct polycrystalline thermistors. At the article short analysis of electrotechnical devices launch processes is given. A power engines launch process with thermistor rheostats is considered and formulated a number of limits. Graphic dependences characterizing launch current and rotating moment at direct launch changing and with rheostats on thermistors are given. An example of launch current for asynchronic engine with phase rotor calculating is given as well.
Keywords: semiconducting thermos-resistance, launch rheostat, launch currents curves, generalized constant, automation.
For the three main processes of the enterprise, identified in the decomposition of its activities, a mathematical model in the space of conditions is developed, taking into account their relationship and interaction in the quality management system. For the obtained system of differential equations, the structural composition of the operators included in it is disclosed. An example of the application of the created mathematical model in the study of the functioning of the quality management system using linear and non-linear operators and the action of random external disturbances is considered. A discussion of the simulation results at various parameter values from the point of view of the functioning of the selected processes is presented.
Keywords: differential equation, space of conditions, process, quality management system
Systems that allow generating programs for monitoring the state of technical objects are explored. The generation of programs involves the construction of models of objects from the data received from them and the construction of data collection processes. The dependences of the complexity of the generation of models of monitoring objects on the dimension of the input stream, the dimensions of the characteristic vectors describing the state of the elements of the objects of monitoring, as well as the dependences of the complexity of the generation of data collection processes on the number of structural levels of objects, the number of information elements on each level, and the probabilities of generating processes on each of the levels. Based on the results obtained, recommendations are formulated on the use of monitoring program generation systems in solving practical problems in particular domain: recommendation on selecting right balance between often and rare model rebuilding and expediency criteria of the monitoring process generation system usage.
Keywords: complex technical object, monitoring, program generation
The article presents a system for monitoring the technical condition of technological mechatronic objects using a neural network of state analysis. The aim of the work is to increase the reliability of the equipment, reduce the number of sudden failures and emergencies by assessing the dynamic state of the spindle unit of the mechatronic technological object. A method for diagnosing the state of the spindle unit of a mechatronic object using a neural network based on the time domain features of vibration signals is proposed and applied. The structure of the neurosystem is proposed. The data obtained during practical tests, as well as the structure of the neural network for diagnosing the state of technological mechatronic objects, are presented.
Keywords: state control, mechatronic object, neural network, spindle unit, vibration signal, time domain features
The article describes in detail the algorithm for constructing a mathematical model that allows you to describe the process of processing a spherical surface, provides an analysis of the change in the radius of the cutter, which allows you to choose the optimal cutting conditions and create conditions for automation of the process.
Keywords: Software, process automation, spherical surface, spherical surface treatment.
The article deals with the reducing issues the time spent of making informed decisions by automating the workplace of a transport engineer on the basis of the development and use of methods for selecting and calculating the number of vehicles for servicing remote objects. A specific example based on the transport service of electric power facilities, which can be implemented in any software of the organization, is considered
Keywords: Workplace automation, transport operation engineer, transport service, electric power facility, calculation of the number of vehicles.
The increasing load on the power supply system of electrified railways leads to higher requirements for reliability of power supply. Clarifying the criteria for the operation of the automated system to combat ice formation on the wires of traction power supply to railways in difficult weather conditions is an urgent task aimed at improving the reliability of uninterrupted power supply of rolling stock
Keywords: ice melting, calculated coefficients, selection of optimal parameters, traction power supply system
The trend of the transition of autonomous vehicles from internal combustion engines to electric drives leads to the need to find intermediate solutions. Hybrid transport is currently a fairly popular compromise. Improving its energy efficiency is possible in several ways. This article shows a software method based on dynamic programming, which allows you to optimize fuel consumption by separating the use of an internal combustion engine and an electric drive. Dynamic programming solves recursive optimization problems when sub-tasks are recounted several times. Also, in this work, mathematical modeling of the car’s movement pattern and determination of the optimal distribution of speed and battery charge depending on the number of fractional bits are carried out. The development of dynamic programming from the point of view of hardware implementation is possible using Field-Programmable Gate Array (FPGA).
Keywords: Hybrid transport, mathematical modeling, dynamic programming, programmable logic integrated circuits, internal combustion engine, electric drive
The purpose of this study is to perform a classification to form a knowledge base in the field of harvesting and use in industry and in the social sphere of one of the valuable types of non-wood forest resources-tree greens. Such knowledge base is necessary for synthesis of new progressive processes, machines and mechanisms for harvesting and use of wood greens. The basis of the classification formation is based on the analysis of technological and technical solutions based on scientific and technical search, given in inventions and utility models patented in 2010-2019 in the Russian Federation. As a result of researches the main directions of patenting of developments in the field of preparation and use of wood greens are classified.
Keywords: modeling, wood density, logging, skidding, forwarder, skidder
The object of the research, the result of which is the presented work, is a comprehensive system of spatial data of the railway infrastructure, within which a high-precision system of coordinates of the Russian Railways has been created, and methods definition of normal heights in the Baltic Heights System 1977. The strategy and prospects for the development of high-speed transport highways (VSM) have been described. Methods for determining normal heights at research sites are given.
Keywords: Global navigation satellite systems (GNSS), GLONASS, high-speed highway (Navy), high-precision coordinate system (WCC), altitude system, quasi-geoid
The article demonstrates the study of the processes of controlling the power system of an electric vehicle and the processes of energy distribution in it using pulse-width voltage converters. The general structure of the electric vehicle’s power system and elements of its subsystems are described. The pulse-width boost and buck DC-DC converters are considered. Based on the given mathematical model, the synthesis of controllers is carried out using the methods of the synergetic control theory. Mathematical modeling of the closed DC-DC converter control system, providing asymptotic stability and adaptability to parametric disturbances, is performed.
Keywords: electric vehicle, pulse-width converters, control system, ADAR, synergetic control theory, integral adaptation
issues of optimization of the structure of the container pneumatic transport system are considered. The expediency of combining the functions of the equipment included in the transport system is shown. A functional diagram of a universal module that performs the functions of all blocks of a pneumatic transport system is presented. A block diagram of a microprocessor control system that provides the functioning of the mechanisms of a universal module is proposed.
Keywords: microprocessor system, pneumatic transport system, transport container, stations of the transport system, control algorithm, structure of the transport system, transport pipeline
The article develops and explores a mobile magnetic platform for autonomous movement along the vertical inner surface of the wall of a steel tank for storing petroleum products. The magnetic platform is developed on the basis of the Arduino system and is used to mount interchangeable diagnostic and treatment equipment. Experimental studies were carried out while simulating the operation of a magnetic platform. During experimental studies, the mass of the maximum static loading of the platform during the operation of treatment equipment was determined. A regression analysis of the results of experimental studies was carried out, which made it possible to determine the relationship between the mass of the additional load from the pressure in the atomizer system. Timing observations of the movement of the magnetic platform with imitation of the operation of the treatment device have been carried out. Timing observations allow you to determine the average operating speed of the robotic complex. The results can be used in the design of robotic systems to diagnose the inner surface of the walls of the tank.
Keywords: magnetic platform, stability determination, diagnostics, cleaning, tanks, robotic system, oil storage
The article is devoted to the possibility of applying the methods of successive approximations in the analysis of the instantaneous scheme of the traction network. The described approach allows to improve the accuracy of modeling dynamic modes of traction power supply sections, and also allows to significantly improve the process of modeling diagnostic systems and control of electric rolling stock at the design stage based on a more accurate model of dynamically changing input parameters of the traction network depending on their required level.
Keywords: traction network, instantaneous circuit, diagnostics, simulation, iteration
The basis of solving the problem of automatic takeoff and landing of helicopters is the problem of orientation of the aircraft relative to the landing site. Existing approaches are based on a combination of satellite positioning technology and sensors. Such solutions have a significant drawback - low positioning accuracy. In this regard, it is necessary to develop new methods that provide low computational complexity and high positioning accuracy relative to the landing site. The article provides an overview of modern solutions in the field of autonomous control of aircraft. The concept of a method for solving the problem of orientation of a helicopter relative to the landing pad is proposed. The approach is based on the use of a camera following the heliport sign. Determining the landing site is based on the theory of fuzzy sets and complex linguistic variables. Complex linguistic variables have three-dimensional membership functions, thus avoiding the problem of uncertainty. Simplification of the computational process is achieved through the use of projections of sections of three-dimensional membership functions.
Keywords: control tracking camera, rotary-wing aircraft, the theory of fuzzy sets, membership functions of terms, linguistic variables
" 849 / 10000 АНГЛИЙСКИЙ In this work the problem of monitoring and diagnostics of power lines glades (transmission lines) with the help of geoinformation technologies is considered. The article identifies the main factors of occurrence of critical situations on power lines, as well as factors that allow to ensure uninterrupted supply of electricity. Taking into account the spatial distribution of power lines, the article proposes to use geoinformation systems, which are an effective means of processing data on power lines. Geoinformation technology of transmission line monitoring is investigated, optimal methods of transmission line monitoring are revealed. Aspects of formation of a security zone for power lines are considered. A model of identifying the risk of an emergency is constructed. The algorithm of monitoring of power lines, their protection zones and identification of emergency areas on the basis of geoinformation technologies is developed."
Keywords: geoinformation system, monitoring, power line, security zone, emergency, cartographic image
Models of monitoring program generation systems are proposed. to significantly reduce the cost of time and other resources for monitoring complex technical objects. Systems are considered at several levels: subsystems and modules, communication links, use cases, physical representation. A technique for adapting system models to subject areas.
Keywords: complex technical object, monitoring, models of software systems, program generation
The mathematical model, the design of the milling head and the method of processing the spherical surface are considered in the article, the calculation formulas for determining the tuning dimensions and diameter of the processed sphere are given.
Keywords: Software, process automation, spherical surface, solid cutting, cutting, spherical surface treatment
the article deals with new methods of accounting and registration system of real estate, based on the introduction of blockchain technologies, which are primarily designed to optimize the procedure of registration of real estate and are decentralized networks that can significantly improve its efficiency.
Keywords: real estate, real estate management, regulation of land and property relations, registration of rights, accounting and registration procedures, legislative system, information database, cadastral registration of real estate, blockchain technology, transac
The paper provides an analysis of the principles of the multichannel protection system. The analysis showed that in order to solve the problem of ensuring secure communication with an external resource through public networks, it is advisable to use a multi-channel system with different channel capacities, while the main channel and spare channels that are connected to work when the main channel cannot handle all incoming applications with probability of 0.95. This model takes into account that the channels are filled hierarchically, and are freed up as the applications are processed.
Keywords: automated system, modeling, protection subsystem, queuing system, probabilistic assessment
The article studies the subject of human settlements with decentralized power supply, included into a locally isolated power supply complex. The basic integrated measures were determined for settlements power lines daily load curves. The results are presented, for dependency assessment between the integrated measures for daily load curves and the number of the settlement’s inhabitants. The dependency has been proven to be effectively described by a second order equation. For the dependency, the correlation coefficient, the determination coefficient and the average approximation error have been given.
Keywords: Power line load curve, decentralized power supply zone, locally isolated power supply complex, approximation
This article analyzes the problem of precise control of the laser beam. The optical signal may deviate and affect the environment. The analysis of the steering system is based on some important factors for designing the structures of the fast steering mirror and the steering system with laser optics. A 4-quadrant detector is used as a sensor for the input light. The design of the developed control loop and the concept of the mirror model are discussed.
Keywords: Fuzzy logic controller, PID controller, Optical focus control and fast steering mirror
Automation of agriculture is currently a promising and actively developing branch of robotics. At the moment, there are many foreign analogues offering ready-made solutions for automatic control of sowing crops. However, in Russia, most of the sowing is carried out on mechanized plants under the mandatory supervision of a highly qualified specialist in the maintenance of the plant.
Keywords: seeding control, microprocessor system, selection, seeding algorithm, system architecture, hardware, system structure, layout base, management methodology, import substitution