We investigated the efficiency of the storage device based on the piezoelectric generator (PEG) in the form bimorph, which is a circular plate with inertial mass; the active material is a PMN-0,33PT relaxor. The plate is fixed along the contour in the body of the device, which performs vertical harmonic oscillations with a given amplitude and frequency. Our studies based on finite element modeling and numerical calculation in the ANSYS package. A notable feature of relaxors is a significant dependence of their properties on temperature, so in this paper, we studied the relation on operating temperature and the magnitude of the active load of the resonant frequencies, output voltages and electric power of the device with oscillations at these frequencies. Based on performed calculations we have established the values of the active resistances of the external electric circuit for different temperature ranges at which the device is most effective.
Keywords: energy storage, relaxor ferroelectric, PEG
The paper presents a developed mathematical model for analyzing the dynamics of thermal losses. The influence of the massiveness of the enclosing structures on the propagation of the heat flux is substantiated. The developed model makes it possible to estimate how the heat load of the heating system of the room under consideration changes over time. Analysis of the dynamics of the change in the heat load can help in choosing a method for regulating the heat transfer of heating devices
Keywords: Dynamics of heat losses, constructions of different massiveness, control range, thermal load, amplitude of oscillation
The method of calculating the heat flow to the ionospheric electrons from photoelectrons resulting from ionization of the neutral atmospheric components by solar radiation in region E of the ionosphere of the Earth is considered . Examples of the calculation of the spectra of photoelectrons and the rate of heat influx to the electron gas at an altitude of 130 km, depending on solar Zenith angle.
Keywords: solar radiation spectra of photoelectrons, the zenith angle of the sun, the collision of electrons, the ionization potential, secondary ionization, effective absorption cross section
Based on our own, as well as literary experimental data, the analysis of the Influence of a barrier material used to create heterogeneous composites based on La0.7Sr0.3MnO3 on their magnetoresistive properties is carried out. Such composites differ in existence of an isotropic negative magnitorezistivnost (MR) connected from backs - dependent tunneling of carriers in magnetic field. The largest value MR up to 15% in the field of 15 kOe are shown when using glass-like GeO2 oxide at a percolation ratio of components.
Keywords: lanthanum strontium manganite, composite material, ceramics, one-step synthesis, magnetoresistance, percolation threshold, dielectric constant, barrier layer, tunneling, spin polarization
Stages of receiving samples of high-austenitic powder steel 110G13P a method of dynamic hot pressing are presented. Processes of formation of structure and properties of steklosoderzhashchy powder steel 110G13P are considered. Significant positive effect on formation of structure of powder steel 110G13P with application glass components is defined.
Keywords: high-austenitic powder steel, method of dynamic hot pressing, agglomeration, mechanical activation of furnace charge, oxidic films
The methods for determining the standards for the preventive maintenance system and repair are analyzed, it is found that the current norms are essentially outdated and require revision at the federal level. It is shown that the specifications for maintenance and repair specified by the operating time for modern cars should be revised in favor of standards determined by their condition, which will allow the introduction of individual standards for each car, taking into account the operating conditions and its technical condition.
Keywords: Strategy, method, standard, parameter, maintenance, repair, maintainability, mileage, reliability, operation
The article is devoted to the development of metrological assurance in the field of experience based on solving optimization problems with the involvement of simulation and statistical models. This technique will improve the accuracy of decisions and reduce the time of development of technology. It is important to establish a system of views on the organization of metrological support of field experience on the basis of a system approach, taking into account the relationship and interaction of the various elements and processes of metrological assurance. The article describes an example of measurement processing of a multifactorial field experiment with application of simulation models, produced on the basis of the identification of correlations, tightness and shape which describe the regression equation or the correlation equation, which allows to obtain accurate solutions.
Keywords: field experience, observation, and optimization technologies, simulation model, regression, correlation, correlation coefficient
We propose a probabilistic and statistical method of estimating parameters of the traction units, which is the creation of acceptable modes of operation taking into account the probabilistic nature of the load, the probability ratios, and other factors that act continuously and systematically change operational characteristics of machine-tractor units. Presents the graphical dependence of the speed of the shaft of the engine SMD-62 degree load and the coefficient of its variation.
Keywords: mathematical expectation, function of communication, frequency of rotation of the motor shaft, the coefficient of variation, the degree of load probability ratio
Hidden defects of the wood can significantly affect for its physical properties and the customs value. For the identification of the hidden defects of the wood currently uses any organoleptic and ultrasonic techniques, which are not always effective for detecting of early forms of fungal damage of the wood. The authors proposed a new method of detecting hidden defects of the wood through UV radiation. To implement the method proposed to use a spectral luminescent magnifier "Regula 4177" with the device PPI "Kedr-M". The study of 128 wood samples showed a rather high efficiency of the proposed method. Were identified features of the luminescence of several types of fungal infections in ultraviolet radiation. The proposed technique can be used to identify hidden defects in the wood at the industry and at the customs control.
Keywords: Hidden defects of wood; ultraviolet radiation, devices, methods of control, identification, customs control
This paper presents an approach to organize the group control underwater vehicles based on multi-loop adaptation algorithm of position-trajectory control system of moving object, with the estimating unmeasured parameters, reference model and contour that ensure astatism 2nd order. Estimation of unmeasured disturbances on the top control level as part of the reference model, which allows for highly accurate positioning of the final master AUV in the target point specified as a parameter to the reference model. The application of the developed algorithm expedient in control systems of moving objects group, where a single object from the leading group, and its parameters are used as the parameters of the reference model. The leading mobile object control system uses an adaptive control system with disturbance estimation. The control systems of the slave moving objects using positional-trajectory control system astatism second order, thereby providing high-precision tracking of the movement of the reference mobile object.
Keywords: group control, AUV, adaptive control, reference model, position, trajectory control, estimator, parameter estimation, the mobile object
The solution on integration of multipass imitating models and the analysis of data in the field of logistics of manufacturing enterprise is proposed. The technology of logistic management on the basis of multipass imitating models will allow to automate management process by design of structure of logistic network of manufacturing enterprise. Demand forecasting, drawing up plans, control of processes in logistic network, expeditious decision-making, will be provided by system of data mining. The developed technology of detection of regularities of information streams in logistics of manufacturing enterprise will help to realize problems of increase in efficiency of functioning by granting means of the analysis of changes in logistic network and in a market environment, and also means of adaptive planning and coordination of processes for all participants of logistic process.
Keywords: imitating model, analysis of data, logistics, manufacturing enterprise, information streams, agentny model, forecasting, discrete and event model, adequacy, warehouses, sales market
The article shows that for more effective planning of forest harvesting operations logging companies require a tool that would assess the amount of industrial bucked wood produced on a сutting area by size, by groups and by timber species. It is so because data available on material and monetary value cut markedly differ from the actual results of the complex harvesting machines working, which are reflected in the summary statement of wood assortments acceptance.
Keywords: cut-to-length logging, marking-cut a coupe and taxation of cutting areas, harvester control systems, a summary statement of wood assortments acceptance
The analysis of existing methods of water use when applied galvanic coatings in the automobile transport sector. It is established that under the existing schemes of water use in the galvanic production wastewater after cleaning goes into the sewer, keeping the risk of contamination of open reservoirs. In such circumstances, the most effective is the use of system of the closed water cycle, which with the help of automatic control allows to take into account changes in the concentration of substances laundered in the washing baths providing the required quality of washing parts with a minimum consumption of water resources.
Keywords: water purification, electroplating system, the water cycle in the galvanic system
The article presents the results of the analysis of satellite information on the water surface temperature of the White Sea. Satellite data with a spatial resolution of 0.011°, obtained by the sensors of the satellites Auqa, Terra, NOAA-18, Coriolis and a time step of 1 day are used. With the help of an automated algorithm, a daily series of mean values of water surface temperature values of the White Sea averaged over the water area was formed.
Keywords: Water surface temperature, White Sea, satellites, automated analysis, daily series, spatial resolution
The article proves the urgency of the problem of increasing the efficiency of the operation of trucks. The data obtained by the laboratory for controlling the reliability of machines of the Academy of Construction and Architecture of the DSTU (RISI) are given.
Keywords: Car, longevity, repair, equipment failure, reduction of machine downtime, work efficiency, fatigue.
Methods of identification of alpha rhythms of the brain are considered. The identification process is rather laborious due to the strong noisiness of the electroencephalograms and their variability. In the article it is proposed to use the ""Caterpillar"" method or the method of singular-spectral analysis, which allows for a more qualitative analysis of different time series, in comparison with the widespread traditional methods.
Keywords: brain waves, alpha rhythm, variability, singular spectrum analysis, electroencephalogram
The crosstalk level increases with increasing degree of circuit integration. At the same time, requirements to their noise immunity increase. The increase in the amplitude of the pulse signals is a simple and effective method to improve noise immunity. The article discusses the synchronization system with the global distribution of low-voltage clock signal and a local increase in the amplitude using drivers with increasing voltage. Proposed technical solutions allow to set the amplitude of the clock signal individually for each functional unit.
Keywords: synchronization, noise immunity, clock signal drivers, amplitude increase, source and power rail reduction
Providing the claimed performance characteristics of the absorber throughout its life is the most important task that ensures the correct operation of the coupler. Increasing requirements for increasing the speed of movement and the volume of freight traffic make it urgent to increase the reliability of the absorbing apparatus by improving the design of its components and components (housing, friction plates, wedge, etc.).
Keywords: Absorbing apparatus, friction plate, cermet, surface wear, defects in absorbing apparatus
Abstract: this article describes a comparative analysis of key figures of motor and railway transport over the period from 1928 to 2016 years. The main tendency and trends are illustrated by graphs, constructed from available accumulated statistics. The article emphasizes the role of strategic planning in accordance with the transport system developing of the Russian Federation in general and by mode of transport. The article provides some data, reflecting the actual state of elements of motor and railway transport systems. According to the author’s opinion, there is a list of strategic objectives of the development of the transport system: general aspects of the amortization policy development in transport area; accelerated amortization for certain types of transport; motor vehicles unification to provide easy dock when you overload on other transport modes, balance of infrastructure characteristics of transport modes in trans-shipment zones ; the new tariff policy, producing an impact on the distribution of traffic in accordance with transport modes; a common development program of the transport system with the elaboration of key points of interaction.
Keywords: Keywords: transport system, logistic system, transport strategy, a program of modernization and development, cargo transportation, cargo handling, state statistics, transport network, rolling stock, state of roads
The article proves the urgency of the development of an expert system for diagnosing the malfunctions of refrigerated trucks. An overview of the main models is given. The tasks of diagnosing refrigerating plants are outlined. The main approaches to troubleshooting the refrigeration unit are formulated.
Keywords: Specialized transport, refrigerator, diagnostics, troubleshooting, reduction of machine downtime, work efficiency
The work is dedicated to the method of threshold separation of digital data, based on the use of bit masks, and evaluated the possibility of its use in the divided transmission data. According to the data split transmission scheme the sender divides the original data into several parts which are independently transmitted via various communication channels, and the receiver reconstructs the original data from parts transmitted. The split transmission can be used to increase the speed of communication or its reliability, as well as to ensure the privacy of transmitted data due to the complication of the problem of interception of multiple communications channels. The requirements for the threshold methods of data sharing for their use in the split transmission are formulated the correspondence between the bit masks method and the advanced requirements is analyzed. An algorithm for using the bit masks method for transferring confidential information in a split transmission system is developed.
Keywords: threshold data separation, shared data transmission, noise immunity, confidentiality, fault-tolerant data storage, bit masks method
Results of research on control object identification based on neural network processes modeling are given. Model of object with control system is represented with a dynamic neural network and regulator model. Regulator function is known. Neural network is trained on the data of control object operating. The resulting model simulate the behavior of the system and lets us find the system’s output, including outputs for periodic test influences. By the resulting complex frequency response we find the parameters of the channel. Observed objects represent technological processes with continuous production. We show an example of identification for laboratory control object channel.
Keywords: Object with control system, identification, neural network, modeling, complex frequency response, transfer function